EXPLAIN PLAN option disabled

Hi,
When I take an Explain Plan using TKPROF it gives the following error:
Error in CREATE TABLE of EXPLAIN PLAN table: APPS.prof$plan_table
ORA-00955: name is already used by an existing object
parse error offset: 18
EXPLAIN PLAN option disabled.
And the Explain Plan is snot displayed in the o/p file for all the queries.
Can any one help me on this.
Thanks,
Kiran

Hi kiran
When I take an Explain Plan using TKPROF it gives the following error:
Error in CREATE TABLE of EXPLAIN PLAN table: APPS.prof$plan_table
ORA-00955: name is already used by an existing object
parse error offset: 18
EXPLAIN PLAN option disabled.
********************************************************************************What is your Db verssion and EBS? What is your kprof syntax. By the way please check those doc adn see its helpful:
Run Adadmin To Recreate Grants And Synonyms ORA-20000 ORA-00955 In Synonyms Loop:create_synonym(GL,PLAN_TABLE,APPS,PLAN_TABLE) [ID 437714.1]
TKPROF With Explain Fails With ORA-00903 invalid table name [ID 257294.1]
OERR: ORA 955 is already used by an existing object [ID 18549.1]
Also check:
Re: TKPROF and Explain Plan
Regard
Helios

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    LOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601 VALUES LESS THAN (TO_DATE(' 2006-02-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602 VALUES LESS THAN (TO_DATE(' 2006-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603 VALUES LESS THAN (TO_DATE(' 2006-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604 VALUES LESS THAN (TO_DATE(' 2006-05-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605 VALUES LESS THAN (TO_DATE(' 2006-06-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606 VALUES LESS THAN (TO_DATE(' 2006-07-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607 VALUES LESS THAN (TO_DATE(' 2006-08-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608 VALUES LESS THAN (TO_DATE(' 2006-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609 VALUES LESS THAN (TO_DATE(' 2006-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610 VALUES LESS THAN (TO_DATE(' 2006-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611 VALUES LESS THAN (TO_DATE(' 2006-12-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612 VALUES LESS THAN (TO_DATE(' 2007-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701 VALUES LESS THAN (TO_DATE(' 2007-02-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702 VALUES LESS THAN (TO_DATE(' 2007-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703 VALUES LESS THAN (TO_DATE(' 2007-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704 VALUES LESS THAN (TO_DATE(' 2007-05-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705 VALUES LESS THAN (TO_DATE(' 2007-06-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    LOGGING
    TABLESPACE PRESC_PARTITION_29
    NOCACHE
    NOPARALLEL;
    Prompt Index BX2_PRESC_PAYER;
    -- BX2_PRESC_PAYER (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX2_PRESC_PAYER ON RETAIL.PRESCRIP_RETAIL
    (PAYER_PLAN)
    TABLESPACE PRESC_PARTITION_29
    LOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX3_PRESC_PAYERCD;
    -- BX3_PRESC_PAYERCD (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX3_PRESC_PAYERCD ON RETAIL.PRESCRIP_RETAIL
    (PYMT_CODE)
    TABLESPACE PRESC_PARTITION_29
    NOLOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX4_PRESC_PRESC;
    -- BX4_PRESC_PRESC (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX4_PRESC_PRESC ON RETAIL.PRESCRIP_RETAIL
    (PRESC_NUM)
    TABLESPACE PRESC_PARTITION_29
    NOLOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX5_PRESC_PIER;
    -- BX5_PRESC_PIER (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX5_PRESC_PIER ON RETAIL.PRESCRIP_RETAIL
    (PIZR_NUM)
    TABLESPACE PRESC_PARTITION_29
    LOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX6_PRESC_RELID;
    -- BX6_PRESC_RELID (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX6_PRESC_RELID ON RETAIL.PRESCRIP_RETAIL
    (RELID)
    TABLESPACE PRESC_PARTITION_29
    LOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX7_PRESC_ME;
    -- BX7_PRESC_ME (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX7_PRESC_ME ON RETAIL.PRESCRIP_RETAIL
    (ME_NUM)
    TABLESPACE PRESC_PARTITION_29
    LOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;
    Prompt Index BX1_PRESC_PROD;
    -- BX1_PRESC_PROD (Index)
    -- Dependencies:
    -- PRESCRIP_RETAIL (Table)
    CREATE BITMAP INDEX RETAIL.BX1_PRESC_PROD ON RETAIL.PRESCRIP_RETAIL
    (PRODUCT_ID, PRODUCT_FRMSTR)
    TABLESPACE PRESC_PARTITION_29
    LOGGING
    LOCAL (
    PARTITION PRESC200406
    NOLOGGING
    TABLESPACE PRESC_PARTITION_30,
    PARTITION PRESC200407
    NOLOGGING
    TABLESPACE PRESC_PARTITION_31,
    PARTITION PRESC200408
    NOLOGGING
    TABLESPACE PRESC_PARTITION_32,
    PARTITION PRESC200409
    NOLOGGING
    TABLESPACE PRESC_PARTITION_33,
    PARTITION PRESC200410
    NOLOGGING
    TABLESPACE PRESC_PARTITION_34,
    PARTITION PRESC200411
    NOLOGGING
    TABLESPACE PRESC_PARTITION_35,
    PARTITION PRESC200412
    NOLOGGING
    TABLESPACE PRESC_PARTITION_36,
    PARTITION PRESC200501
    NOLOGGING
    TABLESPACE PRESC_PARTITION_01,
    PARTITION PRESC200502
    NOLOGGING
    TABLESPACE PRESC_PARTITION_02,
    PARTITION PRESC200503
    NOLOGGING
    TABLESPACE PRESC_PARTITION_03,
    PARTITION PRESC200504
    NOLOGGING
    TABLESPACE PRESC_PARTITION_04,
    PARTITION PRESC200505
    NOLOGGING
    TABLESPACE PRESC_PARTITION_05,
    PARTITION PRESC200506
    NOLOGGING
    TABLESPACE PRESC_PARTITION_06,
    PARTITION PRESC200507
    NOLOGGING
    TABLESPACE PRESC_PARTITION_07,
    PARTITION PRESC200508
    NOLOGGING
    TABLESPACE PRESC_PARTITION_08,
    PARTITION PRESC200509
    NOLOGGING
    TABLESPACE PRESC_PARTITION_09,
    PARTITION PRESC200510
    NOLOGGING
    TABLESPACE PRESC_PARTITION_10,
    PARTITION PRESC200511
    NOLOGGING
    TABLESPACE PRESC_PARTITION_11,
    PARTITION PRESC200512
    NOLOGGING
    TABLESPACE PRESC_PARTITION_12,
    PARTITION PRESC200601
    NOLOGGING
    TABLESPACE PRESC_PARTITION_13,
    PARTITION PRESC200602
    NOLOGGING
    TABLESPACE PRESC_PARTITION_14,
    PARTITION PRESC200603
    NOLOGGING
    TABLESPACE PRESC_PARTITION_15,
    PARTITION PRESC200604
    NOLOGGING
    TABLESPACE PRESC_PARTITION_16,
    PARTITION PRESC200605
    NOLOGGING
    TABLESPACE PRESC_PARTITION_17,
    PARTITION PRESC200606
    NOLOGGING
    TABLESPACE PRESC_PARTITION_18,
    PARTITION PRESC200607
    NOLOGGING
    TABLESPACE PRESC_PARTITION_19,
    PARTITION PRESC200608
    NOLOGGING
    TABLESPACE PRESC_PARTITION_20,
    PARTITION PRESC200609
    NOLOGGING
    TABLESPACE PRESC_PARTITION_21,
    PARTITION PRESC200610
    NOLOGGING
    TABLESPACE PRESC_PARTITION_22,
    PARTITION PRESC200611
    NOLOGGING
    TABLESPACE PRESC_PARTITION_23,
    PARTITION PRESC200612
    NOLOGGING
    TABLESPACE PRESC_PARTITION_24,
    PARTITION PRESC200701
    NOLOGGING
    TABLESPACE PRESC_PARTITION_25,
    PARTITION PRESC200702
    NOLOGGING
    TABLESPACE PRESC_PARTITION_26,
    PARTITION PRESC200703
    NOLOGGING
    TABLESPACE PRESC_PARTITION_27,
    PARTITION PRESC200704
    NOLOGGING
    TABLESPACE PRESC_PARTITION_28,
    PARTITION PRESC200705
    NOLOGGING
    TABLESPACE PRESC_PARTITION_29
    NOPARALLEL;

  • Oracle not using its own explain plan

    When I run a simple select query on an indexed column on a large (30 million records) table oracle creates a plan using the indexed column and at a cost of 4. However, what it actually does is do a table scan (I can see this in the 'Long Operations' tab in OEM).
    The funny thing is that I have the same query in a ADO application and when the query is run from there, the same plan is created but no table scan is done - and the query returns in less than a second. However, with the table scan it is over a minute.
    When run through SQL plus Oracle creates a plan including the table scan at a cost of 19030.
    In another (dot net) application I used the: "Alter session set optimizer_index_caching=100" and "Alter session set optimizer_index_cost_adj=10" to try to force the optimizer to use the index. It creates the expected plan, but still does the table scan.
    The query is in the form of:
    "Select * from tab where indexedcol = something"
    Im using Oracle 9i 9.2.0.1.0
    Any ideas as I'm completely at a loss?

    Hello
    It sounds to me like this has something to do with bind variable peeking which was introduced in 9i. If the predicate is
    indexedcolumn = :bind_variablethe first time the query is parsed by oracle, it will "peek" at the value in the bind variable and see what it is and will generate an execution plan based on this. That same plan will be used for matching SQL.
    If you use a litteral, it will generate the plan based on that, and will generate a separate plan for each litteral you use (depending on the value of the cursor_sharing initialisation parameter).
    This can cause there to be a difference between the execution plan seen when issuing EXPLAIN PLAN FOR, and the actual exectuion plan used when the query is run.
    Have a look at the following example:
    tylerd@DEV2> CREATE TABLE dt_test_bvpeek(id number, col1 number)
      2  /
    Table created.
    Elapsed: 00:00:00.14
    tylerd@DEV2> INSERT
      2  INTO
      3      dt_test_bvpeek
      4  SELECT
      5      rownum,
      6      CASE
      7          WHEN MOD(rownum, 5) IN (0,1,2,3) THEN
      8              1
      9          ELSE
    10              MOD(rownum, 5)
    11          END
    12      END
    13  FROM
    14      dual
    15  CONNECT BY
    16      LEVEL <= 100000
    17  /
    100000 rows created.
    Elapsed: 00:00:00.81
    tylerd@DEV2> select count(*), col1 from dt_test_bvpeek group by col1
      2  /
      COUNT(*)       COL1
         80000          1
         20000          4
    2 rows selected.
    Elapsed: 00:00:00.09
    tylerd@DEV2> CREATE INDEX dt_test_bvpeek_i1 ON dt_test_bvpeek(col1)
      2  /
    Index created.
    Elapsed: 00:00:00.40
    tylerd@DEV2> EXEC dbms_stats.gather_table_stats( ownname=>USER,-
    tabname=>'DT_TEST_BVPEEK',-
    method_opt=>'FOR ALL INDEXED COLUMNS SIZE 254',-
    cascade=>TRUE -
    );PL/SQL procedure successfully completed.
    Elapsed: 00:00:00.73
    tylerd@DEV2> EXPLAIN PLAN FOR
      2  SELECT
      3      *
      4  FROM
      5      dt_test_bvpeek
      6  WHERE
      7      col1 = 1
      8  /
    Explained.
    Elapsed: 00:00:00.01
    tylerd@DEV2> SELECT * FROM TABLE(DBMS_XPLAN.display)
      2  /
    PLAN_TABLE_OUTPUT
    Plan hash value: 2611346395
    | Id  | Operation         | Name           | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT  |                | 78728 |   538K|    82  (52)| 00:00:01 |
    |*  1 |  TABLE ACCESS FULL| DT_TEST_BVPEEK | 78728 |   538K|    82  (52)| 00:00:01 |
    Predicate Information (identified by operation id):
       1 - filter("COL1"=1)
    13 rows selected.
    Elapsed: 00:00:00.06The execution plan for col1=1 was chosen because oracle was able to see that based on the statistics, col1=1 would result in most of the rows from the table being returned.
    tylerd@DEV2> EXPLAIN PLAN FOR
      2  SELECT
      3      *
      4  FROM
      5      dt_test_bvpeek
      6  WHERE
      7      col1 = 4
      8  /
    Explained.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT * FROM TABLE(DBMS_XPLAN.display)
      2  /
    PLAN_TABLE_OUTPUT
    Plan hash value: 3223879139
    | Id  | Operation                   | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT            |                   | 21027 |   143K|    74  (21)| 00:00:01 |
    |   1 |  TABLE ACCESS BY INDEX ROWID| DT_TEST_BVPEEK    | 21027 |   143K|    74  (21)| 00:00:01 |
    |*  2 |   INDEX RANGE SCAN          | DT_TEST_BVPEEK_I1 | 21077 |       |    29  (28)| 00:00:01 |
    Predicate Information (identified by operation id):
       2 - access("COL1"=4)
    14 rows selected.
    Elapsed: 00:00:00.04This time, the optimiser was able to see that col1=4 would result in far fewer rows so it chose to use an index. Look what happens however when we use a bind variable with EXPLAIN PLAN FOR - especially the number of rows the optimiser estimates to be returned from the table
    tylerd@DEV2> var an_col1 NUMBER
    tylerd@DEV2> exec :an_col1:=1;
    PL/SQL procedure successfully completed.
    Elapsed: 00:00:00.00
    tylerd@DEV2>
    tylerd@DEV2> EXPLAIN PLAN FOR
      2  SELECT
      3      *
      4  FROM
      5      dt_test_bvpeek
      6  WHERE
      7      col1 = :an_col1
      8  /
    Explained.
    Elapsed: 00:00:00.01
    tylerd@DEV2> SELECT * FROM TABLE(DBMS_XPLAN.display)
      2  /
    PLAN_TABLE_OUTPUT
    Plan hash value: 2611346395
    | Id  | Operation         | Name           | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT  |                | 49882 |   340K|   100  (60)| 00:00:01 |
    |*  1 |  TABLE ACCESS FULL| DT_TEST_BVPEEK | 49882 |   340K|   100  (60)| 00:00:01 |
    Predicate Information (identified by operation id):
       1 - filter("COL1"=TO_NUMBER(:AN_COL1))
    13 rows selected.
    Elapsed: 00:00:00.04
    tylerd@DEV2>
    tylerd@DEV2> exec :an_col1:=4;
    PL/SQL procedure successfully completed.
    Elapsed: 00:00:00.01
    tylerd@DEV2>
    tylerd@DEV2> EXPLAIN PLAN FOR
      2  SELECT
      3      *
      4  FROM
      5      dt_test_bvpeek
      6  WHERE
      7      col1 = :an_col1
      8  /
    Explained.
    Elapsed: 00:00:00.01
    tylerd@DEV2> SELECT * FROM TABLE(DBMS_XPLAN.display)
      2  /
    PLAN_TABLE_OUTPUT
    Plan hash value: 2611346395
    | Id  | Operation         | Name           | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT  |                | 49882 |   340K|   100  (60)| 00:00:01 |
    |*  1 |  TABLE ACCESS FULL| DT_TEST_BVPEEK | 49882 |   340K|   100  (60)| 00:00:01 |
    Predicate Information (identified by operation id):
       1 - filter("COL1"=TO_NUMBER(:AN_COL1))
    13 rows selected.
    Elapsed: 00:00:00.07For both values of the bind variable, the optimiser has no idea what the value will be so it has to make a calculation based on a formula which results in it estimating that the query will return roughly half of the rows in the table, and so it chooses a full scan.
    Now when we actually run the query, the optimiser can take advantage of bind variable peeking and have a look at the value the first time round and base the execution plan on that:
    tylerd@DEV2> exec :an_col1:=1;
    PL/SQL procedure successfully completed.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT
      2      *
      3  FROM
      4      dt_test_bvpeek
      5  WHERE
      6      col1 = :an_col1
      7  /
    80000 rows selected.
    Elapsed: 00:00:10.98
    tylerd@DEV2> SELECT prev_sql_id FROM v$session WHERE audsid=SYS_CONTEXT('USERENV','SESSIONID')
      2  /
    PREV_SQL_ID
    9t52uyyq67211
    1 row selected.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT
      2      operation,
      3      options,
      4      object_name
      5  FROM
      6      v$sql_plan
      7  WHERE
      8      sql_id = '9t52uyyq67211'
      9  /
    OPERATION                      OPTIONS                        OBJECT_NAME
    SELECT STATEMENT
    TABLE ACCESS                   FULL                           DT_TEST_BVPEEK
    2 rows selected.
    Elapsed: 00:00:00.03It saw that the bind variable value was 1 and that this would return most of the rows in the table so it chose a full scan.
    tylerd@DEV2> exec :an_col1:=4
    PL/SQL procedure successfully completed.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT
      2      *
      3  FROM
      4      dt_test_bvpeek
      5  WHERE
      6      col1 = :an_col1
      7  /
    20000 rows selected.
    Elapsed: 00:00:03.50
    tylerd@DEV2> SELECT prev_sql_id FROM v$session WHERE audsid=SYS_CONTEXT('USERENV','SESSIONID')
      2  /
    PREV_SQL_ID
    9t52uyyq67211
    1 row selected.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT
      2      operation,
      3      options,
      4      object_name
      5  FROM
      6      v$sql_plan
      7  WHERE
      8      sql_id = '9t52uyyq67211'
      9  /
    OPERATION                      OPTIONS                        OBJECT_NAME
    SELECT STATEMENT
    TABLE ACCESS                   FULL                           DT_TEST_BVPEEK
    2 rows selected.
    Elapsed: 00:00:00.01Even though the value of the bind variable changed, the optimiser saw that it already had a cached version of the sql statement along with an execution plan, so it used that rather than regenerating the plan. We can check the reverse of this by causing the statement to be invalidated and re-parsed - there's lots of ways, but I'm just going to rename the table:
    Elapsed: 00:00:00.03
    tylerd@DEV2> alter table dt_test_bvpeek rename to dt_test_bvpeek1
      2  /
    Table altered.
    Elapsed: 00:00:00.01
    tylerd@DEV2>
    20000 rows selected.
    Elapsed: 00:00:04.81
    tylerd@DEV2> SELECT prev_sql_id FROM v$session WHERE audsid=SYS_CONTEXT('USERENV','SESSIONID')
      2  /
    PREV_SQL_ID
    6ztnn4fyt6y5h
    1 row selected.
    Elapsed: 00:00:00.00
    tylerd@DEV2> SELECT
      2      operation,
      3      options,
      4      object_name
      5  FROM
      6      v$sql_plan
      7  WHERE
      8      sql_id = '6ztnn4fyt6y5h'
      9  /
    OPERATION                      OPTIONS                        OBJECT_NAME
    SELECT STATEMENT
    TABLE ACCESS                   BY INDEX ROWID                 DT_TEST_BVPEEK1
    INDEX                          RANGE SCAN                     DT_TEST_BVPEEK_I1
    3 rows selected.
    80000 rows selected.
    Elapsed: 00:00:10.61
    tylerd@DEV2> SELECT prev_sql_id FROM v$session WHERE audsid=SYS_CONTEXT('USERENV','SESSIONID')
      2  /
    PREV_SQL_ID
    6ztnn4fyt6y5h
    1 row selected.
    Elapsed: 00:00:00.01
    tylerd@DEV2> SELECT
      2      operation,
      3      options,
      4      object_name
      5  FROM
      6      v$sql_plan
      7  WHERE
      8      sql_id = '6ztnn4fyt6y5h'
      9  /
    OPERATION                      OPTIONS                        OBJECT_NAME
    SELECT STATEMENT
    TABLE ACCESS                   BY INDEX ROWID                 DT_TEST_BVPEEK1
    INDEX                          RANGE SCAN                     DT_TEST_BVPEEK_I1
    3 rows selected.This time round, the optimiser peeked at the bind variable the first time the statement was exectued and found it to be 4, so it based the execution plan on that and chose an index range scan. When the statement was executed again, it used the plan it had already executed.
    HTH
    David

  • "Explain Plan" in Oracle SQL Developer is greyed out

    Hi all,
    I know this is not the right place to post this, but I have look around and do not know where to post question about Oracle SQL Developer - I presume this tool is also discussed here in this forum.
    My question is very simple (I presume):
    1. I installed Oracle SQL Developer 3.0.04.
    2. I added a new DB connection to a DB hosted in one of my servers in the LAN.
    3. However, when I am writing some SQL queries, I intend to use the "Explain Plan" feature, but it is being greyed out (disabled).
    4. How can I enable it back?

    Hello,
    {forum:id=260}
    Regards
    Marcus

  • Using explain plan

    Hi,
    I am quite new to use explain plan in oracle.
    I want to know what are the important factors that we should emphasize to optimize a SQL query.
    Thanks in Advance,
    Dilip

    If I had to identify key SQL tuning factors to look for in relation to an explain plan I would say that number one is to verify that the plan is driving on the right tables in the proper order.
    Second looking at the SQL make sure it is not written in such a manner as to disable the use of available indexes such as when a trunc is done on an indexed date column so it can be compared equal to another date when a >= date value of midnight and < midnight of first day not desired could be used instead enabling use of the index on the date column by the optimizer. Implicit conversions of join column data types can also disable use of an index.
    Third, if the CBO is doing something other than what you expected do not just assume it is wrong. Try to figure out why it is doing what it is doing and then try to determine if it is right or wrong. I have caught people trying to tune SQL because they knew the plan was wrong, but did not actually test it before spending a lot of time to develop a different path that ran slower than the optimzer plan.
    HTH -- Mark D Powell --

  • DECODE is changing the explain plan

    I have a statement with a decode function in the where clause like this:
    AND decode(:cropcode,-1,'-1',sdu.u_crop_group) = decode(:cropcode,-1,'-1',:cropcode)When I a pass -1 as parameter for cropgroup the filter would result in "AND '-1' = '-1' and the statement is executed in less than 2 seconds. When I leave out this where clause it takes almost 18 seconds. The result is the same so I don't understand why the explain plan is so much different and why not using index scans in the statement without decode.
    Below the explain plans and tkprofs for 1 (without decode) and 2 (with decode).
    *explain 1*
    {code}
    SQL Statement which produced this data:
    select * from table(dbms_xplan.display)
    PLAN_TABLE_OUTPUT
    | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
    | 0 | SELECT STATEMENT | | 7080 | 2413K| | 43611 (2)|
    | 1 | SORT ORDER BY | | 7080 | 2413K| 5224K| 43611 (2)|
    |* 2 | FILTER | | | | | |
    |* 3 | HASH JOIN | | 7156 | 2438K| | 43075 (2)|
    | 4 | TABLE ACCESS FULL | DWH_ABS_DETERMINATION | 17745 | 363K| | 83 (0)|
    |* 5 | HASH JOIN OUTER | | 7156 | 2292K| | 42991 (2)|
    |* 6 | HASH JOIN | | 7156 | 1355K| | 42907 (2)|
    |* 7 | HASH JOIN | | 6987 | 1187K| | 19170 (2)|
    |* 8 | HASH JOIN | | 6947 | 963K| | 10376 (1)|
    |* 9 | TABLE ACCESS BY INDEX ROWID | ALIQUOT | 3 | 144 | | 3 (0)|
    | 10 | NESTED LOOPS | | 6907 | 897K| | 8577 (1)|
    |* 11 | HASH JOIN | | 2264 | 187K| | 1782 (2)|
    | 12 | TABLE ACCESS BY INDEX ROWID | SAMPLE | 190 | 4370 | | 17 (0)|
    | 13 | NESTED LOOPS | | 2264 | 152K| | 107 (1)|
    | 14 | NESTED LOOPS | | 12 | 552 | | 25 (0)|
    |* 15 | TABLE ACCESS FULL | SDG_USER | 12 | 288 | | 13 (0)|
    | 16 | TABLE ACCESS BY INDEX ROWID| SDG | 1 | 22 | | 1 (0)|
    |* 17 | INDEX UNIQUE SCAN | PK_SDG | 1 | | | 0 (0)|
    |* 18 | INDEX RANGE SCAN | FK_SAMPLE_SDG | 597 | | | 2 (0)|
    | 19 | TABLE ACCESS FULL | SAMPLE_USER | 1078K| 16M| | 1669 (1)|
    |* 20 | INDEX RANGE SCAN | FK_ALIQUOT_SAMPLE | 3 | | | 2 (0)|
    | 21 | TABLE ACCESS FULL | ALIQUOT_USER | 3403K| 29M| | 1781 (3)|
    | 22 | TABLE ACCESS FULL | TEST | 3423K| 104M| | 8775 (2)|
    |* 23 | TABLE ACCESS FULL | RESULT | 3435K| 65M| | 23718 (2)|
    | 24 | VIEW | PLATE | 21787 | 2851K| | 84 (2)|
    |* 25 | FILTER | | | | | |
    | 26 | TABLE ACCESS FULL | PLATE | 21787 | 574K| | 84 (2)|
    |* 27 | INDEX UNIQUE SCAN | PK_OPERATOR_GROUP | 1 | 7 | | 0 (0)|
    |* 28 | INDEX UNIQUE SCAN | PK_OPERATOR_GROUP | 1 | 7 | | 0 (0)|
    |* 29 | INDEX UNIQUE SCAN | PK_OPERATOR_GROUP | 1 | 7 | | 0 (0)|
    |* 30 | INDEX UNIQUE SCAN | PK_OPERATOR_GROUP | 1 | 7 | | 0 (0)|
    |* 31 | INDEX UNIQUE SCAN | PK_OPERATOR_GROUP | 1 | 7 | | 0 (0)|
    Predicate Information (identified by operation id):
    2 - filter(("GROUP_ID" IS NULL OR EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP"
    "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B1)) AND ("GROUP_ID" IS NULL
    OR EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP" "OPERATOR_GROUP" WHERE
    "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B2)) AND ("GROUP_ID" IS NULL OR EXISTS (SELECT /*+
    */ 0 FROM "LIMS"."OPERATOR_GROUP" "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND
    "GROUP_ID"=:B3)) AND ("GROUP_ID" IS NULL OR EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP"
    "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B4)))
    3 - access("U_ABS_DETERMINATION"="DETERMINATION_ASSIGNMENT")
    5 - access("PLT"."PLATE_ID"(+)="PLATE_ID")
    6 - access("TEST_ID"="TEST_ID")
    7 - access("ALIQUOT_ID"="ALIQUOT_ID")
    8 - access("ALIQUOT_ID"="ALIQUOT_ID")
    9 - filter("STATUS"='C' OR "STATUS"='P' OR "STATUS"='V')
    11 - access("SAMPLE_ID"="SAMPLE_ID")
    15 - filter("U_ABS_DETERMINATION" IS NOT NULL AND "U_CLIENT_TYPE"='QC' AND
    "U_WEEK_OF_PROCESSING"=TO_NUMBER(:WEEK) AND "U_YEAR_OF_SAMPLE_DELIVERY"=TO_NUMBER(:YEAR))
    17 - access("SDG_ID"="SDG_ID")
    18 - access("SDG_ID"="SDG_ID")
    20 - access("SAMPLE_ID"="SAMPLE_ID")
    23 - filter("NAME"='End result')
    25 - filter("GROUP_ID" IS NULL OR EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP"
    "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B1))
    27 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    28 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    29 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    30 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    31 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    Note
    - 'PLAN_TABLE' is old version
    {code}
    *tkprof 1*
    {code}
    TKPROF: Release 10.2.0.3.0 - Production on Tue Jan 13 13:21:47 2009
    Copyright (c) 1982, 2005, Oracle. All rights reserved.
    Trace file: C:\oracle\product\10.2.0\admin\nautp02\udump\nautp02_ora_880.trc
    Sort options: default
    count = number of times OCI procedure was executed
    cpu = cpu time in seconds executing
    elapsed = elapsed time in seconds executing
    disk = number of physical reads of buffers from disk
    query = number of buffers gotten for consistent read
    current = number of buffers gotten in current mode (usually for update)
    rows = number of rows processed by the fetch or execute call
    SELECT sdu.u_crop_group,
    sd.name as sdg_name,
    ad.variety_name,
    ad.batch_number,
    a.name as aliquot_name,
    sau.u_box_code as box_code,
    sau.u_box_position as box_position,
    t.name as test_name,
    r.original_result,
    plt.name as plate_name,
    concat(chr(a.plate_row + 64),a.plate_column) as plate_position,
    au.u_replicate_number as replicate_number
    FROM lims_sys.sdg sd,
    lims_sys.sdg_user sdu,
    lims_sys.sample sa,
    lims_sys.sample_user sau,
    lims_sys.aliquot a,
    lims_sys.aliquot_user au,
    lims_sys.test t,
    lims_sys.result r,
    lims_sys.plate plt,
    lims_sys.abs_determination ad
    WHERE sd.sdg_id = sdu.sdg_id
    AND sd.sdg_id = sa.sdg_id
    AND sa.sample_id = sau.sample_id
    AND sau.sample_id = a.sample_id
    AND a.aliquot_id = au.aliquot_id
    AND au.aliquot_id = t.aliquot_id
    AND t.test_id = r.test_id
    AND plt.plate_id (+) = a.plate_id
    AND sdu.u_abs_determination = ad.determination_assignment
    AND a.status IN ('V','P','C')
    AND r.name = 'End result'
    AND sdu.u_client_type = 'QC'
    AND sdu.u_year_of_sample_delivery = (:year)
    AND sdu.u_week_of_processing = (:week)
    --AND decode(:cropcode,-1,'-1',sdu.u_crop_group) = decode(:cropcode,-1,'-1',:cropcode)
    ORDER BY box_code, box_position, replicate_number
    call count cpu elapsed disk query current rows
    Parse 1 0.00 0.00 0 0 0 0
    Execute 1 1.15 1.16 0 0 0 0
    Fetch 1 8.53 16.10 227649 241266 0 500
    total 3 9.68 17.27 227649 241266 0 500
    Misses in library cache during parse: 1
    Misses in library cache during execute: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 97
    Rows Row Source Operation
    500 SORT ORDER BY (cr=241266 pr=227649 pw=0 time=16104631 us)
    21311 FILTER (cr=241266 pr=227649 pw=0 time=16246749 us)
    21311 HASH JOIN (cr=241266 pr=227649 pw=0 time=16225434 us)
    17745 TABLE ACCESS FULL DWH_ABS_DETERMINATION (cr=374 pr=0 pw=0 time=69 us)
    21311 HASH JOIN RIGHT OUTER (cr=240892 pr=227649 pw=0 time=16170607 us)
    21895 VIEW PLATE (cr=316 pr=0 pw=0 time=43825 us)
    21895 FILTER (cr=316 pr=0 pw=0 time=43823 us)
    21895 TABLE ACCESS FULL PLATE (cr=316 pr=0 pw=0 time=31 us)
    0 INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    21311 HASH JOIN (cr=240576 pr=227649 pw=0 time=16106174 us)
    21311 HASH JOIN (cr=133559 pr=121596 pw=0 time=9594130 us)
    21311 HASH JOIN (cr=94323 pr=83281 pw=0 time=6917067 us)
    21311 HASH JOIN (cr=86383 pr=75547 pw=0 time=5509672 us)
    7776 HASH JOIN (cr=8134 pr=0 pw=0 time=285364 us)
    7776 TABLE ACCESS BY INDEX ROWID SAMPLE (cr=572 pr=0 pw=0 time=27152 us)
    7876 NESTED LOOPS (cr=377 pr=0 pw=0 time=488287 us)
    99 HASH JOIN (cr=160 pr=0 pw=0 time=4168 us)
    99 TABLE ACCESS FULL SDG_USER (cr=53 pr=0 pw=0 time=1209 us)
    5719 TABLE ACCESS FULL SDG (cr=107 pr=0 pw=0 time=17 us)
    7776 INDEX RANGE SCAN FK_SAMPLE_SDG (cr=217 pr=0 pw=0 time=623 us)(object id 45990)
    1079741 TABLE ACCESS FULL SAMPLE_USER (cr=7562 pr=0 pw=0 time=24 us)
    3307948 TABLE ACCESS FULL ALIQUOT (cr=78249 pr=75547 pw=0 time=3331129 us)
    3406836 TABLE ACCESS FULL ALIQUOT_USER (cr=7940 pr=7734 pw=0 time=556 us)
    3406832 TABLE ACCESS FULL TEST (cr=39236 pr=38315 pw=0 time=3413192 us)
    3406832 TABLE ACCESS FULL RESULT (cr=107017 pr=106053 pw=0 time=6848487 us)
    0 INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    0 INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    0 INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    0 INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    select 'x'
    from
    dual
    call count cpu elapsed disk query current rows
    Parse 1 0.00 0.00 0 0 0 0
    Execute 1 0.00 0.00 0 0 0 0
    Fetch 1 0.00 0.00 0 0 0 1
    total 3 0.00 0.00 0 0 0 1
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 97
    Rows Row Source Operation
    1 FAST DUAL (cr=0 pr=0 pw=0 time=3 us)
    begin :id := sys.dbms_transaction.local_transaction_id; end;
    call count cpu elapsed disk query current rows
    Parse 1 0.00 0.00 0 0 0 0
    Execute 1 0.00 0.00 0 0 0 1
    Fetch 0 0.00 0.00 0 0 0 0
    total 2 0.00 0.00 0 0 0 1
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 97
    OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
    call count cpu elapsed disk query current rows
    Parse 3 0.00 0.00 0 0 0 0
    Execute 3 1.15 1.16 0 0 0 1
    Fetch 2 8.53 16.10 227649 241266 0 501
    total 8 9.68 17.27 227649 241266 0 502
    Misses in library cache during parse: 1
    Misses in library cache during execute: 1
    OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
    call count cpu elapsed disk query current rows
    Parse 30 0.00 0.00 0 0 0 0
    Execute 30 0.00 0.00 0 0 0 0
    Fetch 30 0.00 0.00 0 40 0 10
    total 90 0.00 0.00 0 40 0 10
    Misses in library cache during parse: 0
    3 user SQL statements in session.
    30 internal SQL statements in session.
    33 SQL statements in session.
    Trace file: C:\oracle\product\10.2.0\admin\nautp02\udump\nautp02_ora_880.trc
    Trace file compatibility: 10.01.00
    Sort options: default
    8 sessions in tracefile.
    3 user SQL statements in trace file.
    30 internal SQL statements in trace file.
    33 SQL statements in trace file.
    6 unique SQL statements in trace file.
    633 lines in trace file.
    23 elapsed seconds in trace file.
    {code}

    explain 2
    SQL Statement which produced this data:
      select * from table(dbms_xplan.display)
    PLAN_TABLE_OUTPUT
    | Id  | Operation                               | Name                     | Rows  | Bytes | Cost (%CPU)|
    |   0 | SELECT STATEMENT                        |                          |    71 | 24779 |   857   (1)|
    |   1 |  SORT ORDER BY                          |                          |    71 | 24779 |   857   (1)|
    |*  2 |   FILTER                                |                          |       |       |            |
    |*  3 |    TABLE ACCESS BY INDEX ROWID          | RESULT                   |     1 |    20 |     4   (0)|
    |   4 |     NESTED LOOPS                        |                          |    72 | 25128 |   856   (1)|
    |   5 |      NESTED LOOPS                       |                          |    70 | 23030 |   576   (1)|
    |*  6 |       HASH JOIN OUTER                   |                          |    69 | 20493 |   369   (1)|
    |   7 |        NESTED LOOPS                     |                          |    69 | 11247 |   285   (0)|
    |   8 |         NESTED LOOPS                    |                          |    69 | 10626 |   147   (0)|
    |   9 |          NESTED LOOPS                   |                          |    23 |  2438 |    78   (0)|
    |  10 |           NESTED LOOPS                  |                          |    23 |  2070 |    32   (0)|
    |  11 |            NESTED LOOPS                 |                          |     1 |    67 |    15   (0)|
    |  12 |             NESTED LOOPS                |                          |     1 |    45 |    14   (0)|
    |* 13 |              TABLE ACCESS FULL          | SDG_USER                 |     1 |    24 |    13   (0)|
    |  14 |              TABLE ACCESS BY INDEX ROWID| DWH_ABS_DETERMINATION    |     1 |    21 |     1   (0)|
    |* 15 |               INDEX UNIQUE SCAN         | PK_DWH_ABS_DETERMINATION |     1 |       |     0   (0)|
    |  16 |             TABLE ACCESS BY INDEX ROWID | SDG                      |     1 |    22 |     1   (0)|
    |* 17 |              INDEX UNIQUE SCAN          | PK_SDG                   |     1 |       |     0   (0)|
    |  18 |            TABLE ACCESS BY INDEX ROWID  | SAMPLE                   |   190 |  4370 |    17   (0)|
    |* 19 |             INDEX RANGE SCAN            | FK_SAMPLE_SDG            |   597 |       |     2   (0)|
    |  20 |           TABLE ACCESS BY INDEX ROWID   | SAMPLE_USER              |     1 |    16 |     2   (0)|
    |* 21 |            INDEX UNIQUE SCAN            | PK_SAMPLE_USER           |     1 |       |     1   (0)|
    |* 22 |          TABLE ACCESS BY INDEX ROWID    | ALIQUOT                  |     3 |   144 |     3   (0)|
    |* 23 |           INDEX RANGE SCAN              | FK_ALIQUOT_SAMPLE        |     3 |       |     2   (0)|
    |  24 |         TABLE ACCESS BY INDEX ROWID     | ALIQUOT_USER             |     1 |     9 |     2   (0)|
    |* 25 |          INDEX UNIQUE SCAN              | PK_ALIQUOT_USER          |     1 |       |     1   (0)|
    |  26 |        VIEW                             | PLATE                    | 21787 |  2851K|    84   (2)|
    |* 27 |         FILTER                          |                          |       |       |            |
    |  28 |          TABLE ACCESS FULL              | PLATE                    | 21787 |   574K|    84   (2)|
    |* 29 |          INDEX UNIQUE SCAN              | PK_OPERATOR_GROUP        |     1 |     7 |     0   (0)|
    |  30 |       TABLE ACCESS BY INDEX ROWID       | TEST                     |     1 |    32 |     3   (0)|
    |* 31 |        INDEX RANGE SCAN                 | FK_TEST_ALIQUOT          |     1 |       |     2   (0)|
    |* 32 |      INDEX RANGE SCAN                   | FK_RESULT_TEST           |     2 |       |     2   (0)|
    |* 33 |    INDEX UNIQUE SCAN                    | PK_OPERATOR_GROUP        |     1 |     7 |     0   (0)|
    |* 34 |    INDEX UNIQUE SCAN                    | PK_OPERATOR_GROUP        |     1 |     7 |     0   (0)|
    |* 35 |    INDEX UNIQUE SCAN                    | PK_OPERATOR_GROUP        |     1 |     7 |     0   (0)|
    |* 36 |    INDEX UNIQUE SCAN                    | PK_OPERATOR_GROUP        |     1 |     7 |     0   (0)|
    Predicate Information (identified by operation id):
       2 - filter(("GROUP_ID" IS NULL OR  EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP"
                  "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B1)) AND ("GROUP_ID"
                  IS NULL OR  EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP" "OPERATOR_GROUP" WHERE
                  "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B2)) AND ("GROUP_ID" IS NULL OR  EXISTS
                  (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP" "OPERATOR_GROUP" WHERE
                  "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B3)) AND ("GROUP_ID" IS NULL OR  EXISTS
                  (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP" "OPERATOR_GROUP" WHERE
                  "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B4)))
       3 - filter("NAME"='End result')
       6 - access("PLT"."PLATE_ID"(+)="PLATE_ID")
      13 - filter("U_ABS_DETERMINATION" IS NOT NULL AND "U_CLIENT_TYPE"='QC' AND
                  "U_WEEK_OF_PROCESSING"=TO_NUMBER(:WEEK) AND "U_YEAR_OF_SAMPLE_DELIVERY"=TO_NUMBER(:YEAR) AND
                  DECODE(:CROPCODE,(-1),'-1',"U_CROP_GROUP")=DECODE(:CROPCODE,(-1),'-1',:CROPCODE))
      15 - access("U_ABS_DETERMINATION"="DETERMINATION_ASSIGNMENT")
      17 - access("SDG_ID"="SDG_ID")
      19 - access("SDG_ID"="SDG_ID")
      21 - access("SAMPLE_ID"="SAMPLE_ID")
      22 - filter("STATUS"='C' OR "STATUS"='P' OR "STATUS"='V')
      23 - access("SAMPLE_ID"="SAMPLE_ID")
      25 - access("ALIQUOT_ID"="ALIQUOT_ID")
      27 - filter("GROUP_ID" IS NULL OR  EXISTS (SELECT /*+ */ 0 FROM "LIMS"."OPERATOR_GROUP"
                  "OPERATOR_GROUP" WHERE "OPERATOR_ID"="LIMS$OPERATOR_ID"() AND "GROUP_ID"=:B1))
      29 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
      31 - access("ALIQUOT_ID"="ALIQUOT_ID")
      32 - access("TEST_ID"="TEST_ID")
      33 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
      34 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
      35 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
      36 - access("GROUP_ID"=:B1 AND "OPERATOR_ID"="LIMS$OPERATOR_ID"())
    Note
       - 'PLAN_TABLE' is old version
    tkprof 2
    TKPROF: Release 10.2.0.3.0 - Production on Tue Jan 13 13:28:26 2009
    Copyright (c) 1982, 2005, Oracle.  All rights reserved.
    Trace file: C:\oracle\product\10.2.0\admin\nautp02\udump\nautp02_ora_5456.trc
    Sort options: default
    count    = number of times OCI procedure was executed
    cpu      = cpu time in seconds executing
    elapsed  = elapsed time in seconds executing
    disk     = number of physical reads of buffers from disk
    query    = number of buffers gotten for consistent read
    current  = number of buffers gotten in current mode (usually for update)
    rows     = number of rows processed by the fetch or execute call
    SELECT sdu.u_crop_group,
           sd.name as sdg_name,
           ad.variety_name,
           ad.batch_number,
           a.name as aliquot_name,
           sau.u_box_code as box_code,
           sau.u_box_position as box_position,
           t.name as test_name,
           r.original_result,
           plt.name as plate_name,
           concat(chr(a.plate_row + 64),a.plate_column) as plate_position,
           au.u_replicate_number as replicate_number
    FROM lims_sys.sdg sd,
         lims_sys.sdg_user sdu,
         lims_sys.sample sa,
         lims_sys.sample_user sau,
         lims_sys.aliquot a,
         lims_sys.aliquot_user au,
         lims_sys.test t,
         lims_sys.result r,
         lims_sys.plate plt,
         lims_sys.abs_determination ad
    WHERE sd.sdg_id = sdu.sdg_id
      AND sd.sdg_id = sa.sdg_id
      AND sa.sample_id = sau.sample_id
      AND sau.sample_id = a.sample_id
      AND a.aliquot_id = au.aliquot_id
      AND au.aliquot_id = t.aliquot_id
      AND t.test_id = r.test_id
      AND plt.plate_id (+) = a.plate_id
      AND sdu.u_abs_determination = ad.determination_assignment
      AND a.status IN ('V','P','C')
      AND r.name = 'End result'
      AND sdu.u_client_type = 'QC'
      AND sdu.u_year_of_sample_delivery = (:year)
      AND sdu.u_week_of_processing = (:week)
      AND decode(:cropcode,-1,'-1',sdu.u_crop_group) = decode(:cropcode,-1,'-1',:cropcode)
    ORDER BY box_code, box_position, replicate_number
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        1      0.01       0.00          0          0          0           0
    Execute      1      0.45       0.87          0          0          0           0
    Fetch        1      1.00       0.99          0     221420          0         500
    total        3      1.46       1.86          0     221420          0         500
    Misses in library cache during parse: 1
    Misses in library cache during execute: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 97 
    Rows     Row Source Operation
        500  SORT ORDER BY (cr=221420 pr=0 pw=0 time=992364 us)
      21311   FILTER  (cr=221420 pr=0 pw=0 time=1128970 us)
      21311    TABLE ACCESS BY INDEX ROWID RESULT (cr=221420 pr=0 pw=0 time=1086345 us)
      42623     NESTED LOOPS  (cr=217549 pr=0 pw=0 time=30006317 us)
      21311      NESTED LOOPS  (cr=174880 pr=0 pw=0 time=809278 us)
      21311       NESTED LOOPS  (cr=110117 pr=0 pw=0 time=553538 us)
      21311        HASH JOIN OUTER (cr=46182 pr=0 pw=0 time=319102 us)
      21311         TABLE ACCESS BY INDEX ROWID ALIQUOT (cr=45866 pr=0 pw=0 time=193037 us)
      29088          NESTED LOOPS  (cr=39885 pr=0 pw=0 time=320084 us)
       7776           NESTED LOOPS  (cr=24267 pr=0 pw=0 time=156721 us)
       7776            NESTED LOOPS  (cr=937 pr=0 pw=0 time=78954 us)
         99             NESTED LOOPS  (cr=454 pr=0 pw=0 time=3826 us)
         99              NESTED LOOPS  (cr=253 pr=0 pw=0 time=2833 us)
         99               TABLE ACCESS FULL SDG_USER (cr=53 pr=0 pw=0 time=1531 us)
         99               TABLE ACCESS BY INDEX ROWID DWH_ABS_DETERMINATION (cr=200 pr=0 pw=0 time=956 us)
         99                INDEX UNIQUE SCAN PK_DWH_ABS_DETERMINATION (cr=101 pr=0 pw=0 time=438 us)(object id 46965)
         99              TABLE ACCESS BY INDEX ROWID SDG (cr=201 pr=0 pw=0 time=707 us)
         99               INDEX UNIQUE SCAN PK_SDG (cr=101 pr=0 pw=0 time=330 us)(object id 46071)
       7776             TABLE ACCESS BY INDEX ROWID SAMPLE (cr=483 pr=0 pw=0 time=16261 us)
       7776              INDEX RANGE SCAN FK_SAMPLE_SDG (cr=217 pr=0 pw=0 time=562 us)(object id 45990)
       7776            TABLE ACCESS BY INDEX ROWID SAMPLE_USER (cr=23330 pr=0 pw=0 time=64710 us)
       7776             INDEX UNIQUE SCAN PK_SAMPLE_USER (cr=15554 pr=0 pw=0 time=33728 us)(object id 46012)
      21311           INDEX RANGE SCAN FK_ALIQUOT_SAMPLE (cr=15618 pr=0 pw=0 time=43423 us)(object id 45346)
      21895         VIEW  PLATE (cr=316 pr=0 pw=0 time=43833 us)
      21895          FILTER  (cr=316 pr=0 pw=0 time=21936 us)
      21895           TABLE ACCESS FULL PLATE (cr=316 pr=0 pw=0 time=37 us)
          0           INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
      21311        TABLE ACCESS BY INDEX ROWID ALIQUOT_USER (cr=63935 pr=0 pw=0 time=182479 us)
      21311         INDEX UNIQUE SCAN PK_ALIQUOT_USER (cr=42624 pr=0 pw=0 time=99160 us)(object id 45386)
      21311       TABLE ACCESS BY INDEX ROWID TEST (cr=64763 pr=0 pw=0 time=219096 us)
      21311        INDEX RANGE SCAN FK_TEST_ALIQUOT (cr=42669 pr=0 pw=0 time=129354 us)(object id 46222)
      21311      INDEX RANGE SCAN FK_RESULT_TEST (cr=42669 pr=0 pw=0 time=125893 us)(object id 45940)
          0    INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
          0    INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
          0    INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
          0    INDEX UNIQUE SCAN PK_OPERATOR_GROUP (cr=0 pr=0 pw=0 time=0 us)(object id 45769)
    select 'x'
    from
    dual
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        1      0.00       0.00          0          0          0           0
    Execute      1      0.00       0.00          0          0          0           0
    Fetch        1      0.00       0.00          0          0          0           1
    total        3      0.00       0.00          0          0          0           1
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 97 
    Rows     Row Source Operation
          1  FAST DUAL  (cr=0 pr=0 pw=0 time=6 us)
    begin :id := sys.dbms_transaction.local_transaction_id; end;
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        1      0.00       0.00          0          0          2           0
    Execute      1      0.00       0.00          0          0          0           1
    Fetch        0      0.00       0.00          0          0          0           0
    total        2      0.00       0.00          0          0          2           1
    Misses in library cache during parse: 1
    Misses in library cache during execute: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 97 
    OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        3      0.01       0.00          0          0          2           0
    Execute      3      0.45       0.87          0          0          0           1
    Fetch        2      1.00       0.99          0     221420          0         501
    total        8      1.46       1.87          0     221420          2         502
    Misses in library cache during parse: 2
    Misses in library cache during execute: 2
    OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
    call     count       cpu    elapsed       disk      query    current        rows
    Parse       43      0.01       0.00          0          0         12           0
    Execute    128      0.00       0.01          0          0          0           0
    Fetch      178      0.00       0.00          0        383          0         465
    total      349      0.01       0.02          0        383         12         465
    Misses in library cache during parse: 5
    Misses in library cache during execute: 5
        3  user  SQL statements in session.
      128  internal SQL statements in session.
      131  SQL statements in session.
    Trace file: C:\oracle\product\10.2.0\admin\nautp02\udump\nautp02_ora_5456.trc
    Trace file compatibility: 10.01.00
    Sort options: default
           1  session in tracefile.
           3  user  SQL statements in trace file.
         128  internal SQL statements in trace file.
         131  SQL statements in trace file.
          19  unique SQL statements in trace file.
        1352  lines in trace file.
         287  elapsed seconds in trace file.

  • Explain plan shows 300T of TempSpc and 999 hours - tuning request

    Hi,
    I have a query which obtains summary statistics. There is an items table which contains the dictionary of items which can be recorded. There is an events table which contains the item ID, timestamp and a value. The query summarizes the data for each item. e.g. Mean, stddev, sample values, length. I have trimmed the query down as simply as possible and am having a problem with large temp space and runtime estimates in the explain plan. Here is the query:
    WITH ChartItems AS (
        SELECT
          ci.itemid,
          ci.label,
          ci.category,
          ci.description,
          COUNT(*),
          COUNT(distinct subject_id)
        FROM mimic2v26.d_chartitems ci
        JOIN mimic2v26.chartevents ce ON ce.itemid = ci.itemid
        --WHERE ci.itemid = 51
        GROUP BY ci.itemid,
                 ci.label,
                 ci.category,
                 ci.description
    --select * from ChartItems;
    , RawData AS (
        SELECT DISTINCT
          ci.itemid,
          ci.label,
          ci.category,
          ci.description,
          last_value(ce.value1) ignore nulls over (partition BY ci.itemid order by
          ce.charttime ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS
          value1_last
        FROM ChartItems ci
        JOIN mimic2v26.chartevents ce ON ce.itemid = ci.itemid
    select * from RawData;Which gives this explain plan:
    Plan hash value: 642453121
    | Id  | Operation                    | Name           | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT             |                |  4811G|  1238T|       |  3686M (13)|999:59:59 |
    |   1 |  VIEW                        |                |  4811G|  1238T|       |  3686M (13)|999:59:59 |
    |   2 |   HASH UNIQUE                |                |  4811G|   258T|       |  3686M (13)|999:59:59 |
    |   3 |    WINDOW BUFFER             |                |  4811G|   258T|       |  3686M (13)|999:59:59 |
    |   4 |     SORT GROUP BY            |                |  4811G|   258T|   317T|  3686M (13)|999:59:59 |
    |*  5 |      HASH JOIN               |                |  4811G|   258T|  4943M|    25M (90)| 85:14:28 |
    |   6 |       VIEW                   | VW_DAG_0       |   152M|  3199M|       |  1366K  (1)| 04:33:18 |
    |   7 |        HASH GROUP BY         |                |   152M|  4216M|  5839M|  1366K  (1)| 04:33:18 |
    |*  8 |         HASH JOIN            |                |   152M|  4216M|       |   147K  (2)| 00:29:36 |
    |   9 |          TABLE ACCESS FULL   | D_CHARTITEMS   |  4832 | 96640 |       |     7   (0)| 00:00:01 |
    |  10 |          INDEX FAST FULL SCAN| CHARTEVENTS_O2 |   196M|  1683M|       |   147K  (1)| 00:29:25 |
    |  11 |       TABLE ACCESS FULL      | CHARTEVENTS    |   196M|  6922M|       |   616K  (1)| 02:03:19 |
    Predicate Information (identified by operation id):
       5 - access("CE"."ITEMID"="ITEM_2")300T of temp space! Ouch.
    TKPROF output (I let the query run for a short while. I let it run for ages earlier, but wasn't tracing the session. Should I let it run for longer?):
    TKPROF: Release 11.2.0.3.0 - Development on Tue Jul 10 16:54:27 2012
    Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
    Trace file: /oracle/11gr2/app/oracle/diag/rdbms/mimic2/mimic2/trace/mimic2_ora_6507.trc
    Sort options: default
    count    = number of times OCI procedure was executed
    cpu      = cpu time in seconds executing
    elapsed  = elapsed time in seconds executing
    disk     = number of physical reads of buffers from disk
    query    = number of buffers gotten for consistent read
    current  = number of buffers gotten in current mode (usually for update)
    rows     = number of rows processed by the fetch or execute call
    WITH ChartItems AS (
        SELECT
          ci.itemid,
          ci.label,
          ci.category,
          ci.description,
          COUNT(*),
          COUNT(distinct subject_id)
        FROM mimic2v26.d_chartitems ci
        JOIN mimic2v26.chartevents ce ON ce.itemid = ci.itemid
        GROUP BY ci.itemid,
                 ci.label,
                 ci.category,
                 ci.description
    , RawData AS (
        SELECT DISTINCT
          ci.itemid,                                                                                                                                                                                           
          ci.label,                                                                                                                                                                                            
          ci.category,                                                                                                                                                                                         
          ci.description,                                                                                                                                                                                      
          last_value(ce.value1) ignore nulls over (partition BY ci.itemid order by                                                                                                                             
          ce.charttime ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS                                                                                                                            
          value1_last                                                                                                                                                                                          
        FROM ChartItems ci                                                                                                                                                                                     
        JOIN mimic2v26.chartevents ce ON ce.itemid = ci.itemid                                                                                                                                                 
    select * from RawData                                                                                                                                                                                      
    call     count       cpu    elapsed       disk      query    current        rows                                                                                                                           
    Parse        1      0.02       0.02          0          0          0           0                                                                                                                           
    Execute      1      0.00       0.00          0          0          0           0                                                                                                                           
    Fetch        1    582.40     712.23     705238     737351          0           0                                                                                                                           
    total        3    582.43     712.25     705238     737351          0           0                                                                                                                           
    Misses in library cache during parse: 1                                                                                                                                                                    
    Optimizer mode: ALL_ROWS                                                                                                                                                                                   
    Parsing user id: 85 
    Number of plan statistics captured: 1
    Rows (1st) Rows (avg) Rows (max)  Row Source Operation
             0          0          0  VIEW  (cr=0 pr=0 pw=0 time=184 us cost=3686387254 size=1361581801333882 card=4811243114254)
             0          0          0   HASH UNIQUE (cr=0 pr=0 pw=0 time=180 us cost=3686387254 size=283863343740986 card=4811243114254)
             0          0          0    WINDOW BUFFER (cr=0 pr=0 pw=0 time=74 us cost=3686387254 size=283863343740986 card=4811243114254)
             0          0          0     SORT GROUP BY (cr=0 pr=0 pw=0 time=59 us cost=3686387254 size=283863343740986 card=4811243114254)
    178073889  178073889  178073889      HASH JOIN  (cr=737351 pr=705238 pw=124635 time=476372451 us cost=25572251 size=283863343740986 card=4811243114254)
       6211631    6211631    6211631       VIEW  VW_DAG_0 (cr=613768 pr=581413 pw=35805 time=286546567 us cost=1366486 size=3354399576 card=152472708)
       6211631    6211631    6211631        HASH GROUP BY (cr=613768 pr=581413 pw=35805 time=281271878 us cost=1366486 size=4421708532 card=152472708)
    196182740  196182740  196182740         HASH JOIN  (cr=613768 pr=545608 pw=0 time=557485047 us cost=147987 size=4421708532 card=152472708)
          4832       4832       4832          TABLE ACCESS FULL D_CHARTITEMS (cr=18 pr=16 pw=0 time=13666 us cost=7 size=96640 card=4832)
    196182740  196182740  196182740          INDEX FAST FULL SCAN CHARTEVENTS_O2 (cr=613750 pr=545592 pw=0 time=148428499 us cost=147046 size=1765644660 card=196182740)(object id 96501)
      10683044   10683044   10683044       TABLE ACCESS FULL CHARTEVENTS (cr=123583 pr=123825 pw=0 time=25175510 us cost=616507 size=7258761380 card=196182740)
    Elapsed times include waiting on following events:
      Event waited on                             Times   Max. Wait  Total Waited
      ----------------------------------------   Waited  ----------  ------------
      SQL*Net message to client                       1        0.00          0.00
      db file sequential read                         2        0.01          0.01
      db file scattered read                          3        0.02          0.03
      direct path read                             5265        0.75         77.13
      asynch descriptor resize                        1        0.00          0.00
      direct path write temp                      15077        0.71         45.54
      direct path read temp                        2387        0.29         13.54
      SQL*Net break/reset to client                   1        0.66          0.66
      SQL*Net message from client                     1        0.00          0.00
    SQL ID: 7jby2dxrpkkm9 Plan Hash: 1388734953
    select SYS_CONTEXT('USERENV','SESSIONID')
    from
    dual
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        1      0.00       0.01          0          0          0           0
    Execute      1      0.00       0.00          0          0          0           0
    Fetch        1      0.00       0.00          0          0          0           1
    total        3      0.00       0.01          0          0          0           1
    Misses in library cache during parse: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 85 
    Number of plan statistics captured: 1
    Rows (1st) Rows (avg) Rows (max)  Row Source Operation
             1          1          1  FAST DUAL  (cr=0 pr=0 pw=0 time=4 us cost=2 size=0 card=1)
    Elapsed times include waiting on following events:
      Event waited on                             Times   Max. Wait  Total Waited
      ----------------------------------------   Waited  ----------  ------------
      SQL*Net message to client                       1        0.00          0.00
    OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        2      0.02       0.04          0          0          0           0
    Execute      2      0.00       0.00          0          0          0           0
    Fetch        2    582.40     712.23     705238     737351          0           1
    total        6    582.43     712.27     705238     737351          0           1
    Misses in library cache during parse: 2
    Elapsed times include waiting on following events:
      Event waited on                             Times   Max. Wait  Total Waited
      ----------------------------------------   Waited  ----------  ------------
      SQL*Net message to client                       4        0.00          0.00
      db file sequential read                         2        0.01          0.01
      db file scattered read                          3        0.02          0.03
      direct path read                             5265        0.75         77.13
      asynch descriptor resize                        1        0.00          0.00
      direct path write temp                      15077        0.71         45.54
      direct path read temp                        2387        0.29         13.54
      SQL*Net break/reset to client                   1        0.66          0.66
      SQL*Net message from client                     3       14.99         15.01
    OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        0      0.00       0.00          0          0          0           0
    Execute      0      0.00       0.00          0          0          0           0
    Fetch        0      0.00       0.00          0          0          0           0
    total        0      0.00       0.00          0          0          0           0
    Misses in library cache during parse: 0
        2  user  SQL statements in session.
        0  internal SQL statements in session.
        2  SQL statements in session.
    Trace file: /oracle/11gr2/app/oracle/diag/rdbms/mimic2/mimic2/trace/mimic2_ora_6507.trc
    Trace file compatibility: 11.1.0.7
    Sort options: default
           1  session in tracefile.
           2  user  SQL statements in trace file.
           0  internal SQL statements in trace file.
           2  SQL statements in trace file.
           2  unique SQL statements in trace file.
       24245  lines in trace file.
         728  elapsed seconds in trace file.Optimizer parameters:
    NAME                                               TYPE        VALUE                                                                                               
    optimizer_capture_sql_plan_baselines               boolean     FALSE                                                                                               
    optimizer_dynamic_sampling                         integer     2                                                                                                   
    optimizer_features_enable                          string      11.2.0.3                                                                                            
    optimizer_index_caching                            integer     0                                                                                                   
    optimizer_index_cost_adj                           integer     100                                                                                                 
    optimizer_mode                                     string      ALL_ROWS                                                                                            
    optimizer_secure_view_merging                      boolean     TRUE                                                                                                
    optimizer_use_invisible_indexes                    boolean     FALSE                                                                                               
    optimizer_use_pending_statistics                   boolean     FALSE                                                                                               
    optimizer_use_sql_plan_baselines                   boolean     TRUE                                                                                                 Can anyone help me figure out what's wrong?
    This is a data warehouse, with up to date statistics. The DB is version 11.2.0.3.0
    Thanks,
    Dan

    rp0428 wrote:
    >
    I trimmed the query down to the simplest that I could which still exhibited the problem
    >
    The DISTINCT isn't the issue. The issue is that the query you posted isn't necessary and doesn't appear to be represented in the plan that you posted.
    That makes it hard to tell where the cardinality misestimates are coming from. How many records does the actual first query (the one with the group by) return? You have a SELECT * commented out - how many rows?No, it's not necessary, but then it isn't the full query. The estimates are still wrong when I pass the count columns through to the second query. The full query contains many more analytic functions in the second query, and some additions to the first. It could probably be cleaned up a little, but the current structure makes logical sense. Should I change the aggregates to analytics and move them into the second query? In any case, there definitely seems to be something wrong with the plan.
    I don't know what you mean when you say "doesn't appear to be represented in the plan that you posted".
    I just checked the first query and while the temp space has dropped to a reasonable amount, the number of rows in the hash join is still way off (I didn't notice before because I was looking at the temp space). The rows for d_chartitems and the index on chartevents are correct:
    Plan hash value: 1249235674
    | Id  | Operation               | Name           | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT        |                |   152M|    35G|       |  1366K  (1)| 04:33:18 |
    |   1 |  VIEW                   |                |   152M|    35G|       |  1366K  (1)| 04:33:18 |
    |   2 |   WINDOW SORT           |                |   152M|  4216M|  5839M|  1366K  (1)| 04:33:18 |
    |*  3 |    HASH JOIN            |                |   152M|  4216M|       |   147K  (2)| 00:29:36 |
    |   4 |     TABLE ACCESS FULL   | D_CHARTITEMS   |  4832 | 96640 |       |     7   (0)| 00:00:01 |
    |   5 |     INDEX FAST FULL SCAN| CHARTEVENTS_O2 |   196M|  1683M|       |   147K  (1)| 00:29:25 |
    Predicate Information (identified by operation id):
       3 - access("CE"."ITEMID"="CI"."ITEMID")Edited by: danscott on Jul 10, 2012 5:43 PM
    Edited by: danscott on Jul 11, 2012 6:28 AM

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