SQL Tuning Advise

Hello
I have a very huge table to join itself.
SELECT
FROM huge_table a,
(select id,MAX(txndate)
from huge_table
where .....
group by id) b
WHERE a.id = b.id
AND a.txndate = b.txndate;
I found this statement really a time-consuming statement after execute it. Anyone have good idea to tune this ?
Thanks
Regards,
ckwan

Regarding this table, I had created indexes for id and txntimestamp.
But the performance still not ideal.
Thanks

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                    BU_SYS_ITM_NUM,
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    snippet .....
    FINDINGS SECTION (1 finding)
    1- Index Finding (see explain plans section below)
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    Error: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
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    Rogers

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    SUM ("INVC_ACTY_SNPSHT_FACT_VW6"."INVC_DUP_REDUC_AMT")
    "C11",
    SUM ("INVC_ACTY_SNPSHT_FACT_VW6"."INVC_OSR_REDUC_AMT")
    "C12",
    ( SUM (
    "INVC_ACTY_SNPSHT_FACT_VW6"."INVC_CHRGS_AMT")
    - SUM ("INVC_ACTY_SNPSHT_FACT_VW6"."INVC_ALWC_AMT"))
    - SUM (
    "INVC_ACTY_SNPSHT_FACT_VW6"."INVC_DUP_REDUC_AMT")
    "C13",
    SUM (
    "INVC_ACTY_SNPSHT_FACT_VW6"."INVC_CLNT_SPEC_REDUC_AMT")
    "C14"
    FROM "CDW_DLV_IDS"."WCRS_POLICY_GROUPING_VW" "WCRS_POLICY_GROUPING_VW",
    "WCRS_CLAIM_DETAIL_VW5",
    "EDW_DM"."INVC_DIM_VW" "INVC_DIM_VW",
    "EDW_DM"."PROVIDER_NETWORK_DIM_VW" "PROVIDER_NETWORK_DIM_VW",
    "EDW_DM"."INVC_ACTY_SNPSHT_FACT_VW" "INVC_ACTY_SNPSHT_FACT_VW6",
    "EDW_DM"."CURRENT_MED_INVC_RPT_DT_VW" "CURRENT_MED_INVC_RPT_DT_VW",
    "EDW_DM"."ALL_INVC_SNPSHT_FACT_VW" "ALL_INVC_SNPSHT_FACT_VW",
    "CDW_DLV_IDS"."WCRS_CURRENT_CLAIM_RPT_DT_VW" "WCRS_CURRENT_CLAIM_RPT_DT_VW",
    "CDW_DLV_IDS"."WCRS_CLAIM_FACT_VW" "WCRS_CLAIM_FACT_VW",
    "WCRS_POLICY_DETAIL_VW7",
    "EDW_DM"."INVC_CLAIM_DTL_BRDG_FACT_VW" "INVC_CLAIM_DTL_BRDG_FACT_VW"
    WHERE "INVC_DIM_VW"."INVC_DELETION_IND" <> 'Y'
    AND "INVC_DIM_VW"."INVC_CONSIDRTN_TYPE_DESC" =
    'Original'
    AND "CURRENT_MED_INVC_RPT_DT_VW"."CURRENT_MONTH_RPT_DT" =
    "ALL_INVC_SNPSHT_FACT_VW"."AS_OF_MONTH_END_DT_PK_ID"
    AND "WCRS_CURRENT_CLAIM_RPT_DT_VW"."CURRENT_CLAIM_RPT_DT" =
    "WCRS_CLAIM_FACT_VW"."CLAIM_REPORTING_DT"
    AND "WCRS_POLICY_GROUPING_VW"."ACCOUNT_NM" =
    CAST ('1ST TEAM STAFFING SERVICES, INC.' AS VARCHAR (50 CHAR))
    AND "WCRS_POLICY_DETAIL_VW7"."POLICY_NBR" =
    "WCRS_POLICY_GROUPING_VW"."POLICY_IDENTIFIER"
    AND "WCRS_POLICY_DETAIL_VW7"."CLAIM_NBR" =
    "WCRS_CLAIM_FACT_VW"."CLAIM_NBR"
    AND "WCRS_POLICY_DETAIL_VW7"."CLAIM_SYMBOL_CD" =
    "WCRS_CLAIM_FACT_VW"."CLAIM_SYMBOL_CD"
    AND "WCRS_POLICY_DETAIL_VW7"."KEY_OFFICE_CD" =
    "WCRS_CLAIM_FACT_VW"."KEY_OFFICE_CD"
    AND "WCRS_POLICY_DETAIL_VW7"."CURRENT_SNAPSHOT_IND" =
    'Y'
    AND "WCRS_CLAIM_FACT_VW"."CLAIM_DETAIL_PK_ID" =
    "WCRS_CLAIM_DETAIL_VW5"."CLAIM_DETAIL_PK_ID"
    AND "WCRS_CLAIM_DETAIL_VW5"."CURRENT_SNAPSHOT_IND" =
    'Y'
    AND "WCRS_CLAIM_FACT_VW"."CLAIM_GID" =
    "INVC_CLAIM_DTL_BRDG_FACT_VW"."CLM_GID"
    AND "INVC_CLAIM_DTL_BRDG_FACT_VW"."INVC_GID" =
    "INVC_DIM_VW"."INVC_GID"
    AND "INVC_DIM_VW"."INVC_PK_ID" =
    "INVC_ACTY_SNPSHT_FACT_VW6"."INVC_PK_ID"
    AND "ALL_INVC_SNPSHT_FACT_VW"."MONTH_END_DT_PK_ID" =
    "INVC_ACTY_SNPSHT_FACT_VW6"."MONTH_END_DT_PK_ID"
    AND "ALL_INVC_SNPSHT_FACT_VW"."INVC_GID" =
    "INVC_ACTY_SNPSHT_FACT_VW6"."INVC_GID"
    AND "PROVIDER_NETWORK_DIM_VW"."PROVIDER_NETWORK_PK_ID" =
    "INVC_ACTY_SNPSHT_FACT_VW6"."PPO_PROVIDER_NETWORK_PK_ID"
    AND "WCRS_CURRENT_CLAIM_RPT_DT_VW"."CURRENT_CLAIM_RPT_DT" =
    "WCRS_CLAIM_FACT_VW"."CLAIM_REPORTING_DT"
    GROUP BY "WCRS_POLICY_GROUPING_VW"."ACCOUNT_NM",
    "WCRS_CLAIM_DETAIL_VW5"."REGULATORY_STATE_CD",
    CASE
    WHEN "INVC_DIM_VW"."INVC_IN_OUT_OF_NETWORK_IND" =
    'Y'
    THEN
    'In - Network'
    WHEN "INVC_DIM_VW"."INVC_IN_OUT_OF_NETWORK_IND" =
    'N'
    THEN
    'Out - Network'
    ELSE
    'Others'
    END,
    "PROVIDER_NETWORK_DIM_VW"."PROVIDER_NETWORK_NM",
    "INVC_DIM_VW"."INVC_CLASS_TYPE_DESC",
    CASE
    WHEN (EXTRACT (
    YEAR FROM ("WCRS_CLAIM_DETAIL_VW5"."LOSS_DT"))
    IS NULL)
    OR (EXTRACT (
    MONTH FROM ("WCRS_CLAIM_DETAIL_VW5"."LOSS_DT"))
    IS NULL)
    THEN
    NULL
    ELSE
    ( EXTRACT (
    YEAR FROM ("WCRS_CLAIM_DETAIL_VW5"."LOSS_DT"))
    || EXTRACT (
    MONTH FROM ("WCRS_CLAIM_DETAIL_VW5"."LOSS_DT")))
    END) "T1") "T0"
    ORDER BY "Account_Name" ASC NULLS LAST,
    "Accident_State_Cd" ASC NULLS LAST,
    "c3" ASC NULLS LAST,
    "PPO_Name" ASC NULLS LAST,
    "Invc_Classification_Type_Desc" ASC NULLS LAST

    | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
    | 0 | SELECT STATEMENT | | 1 | 838 | 1079K (1)| 00:00:34 | | |
    | 1 | TEMP TABLE TRANSFORMATION | | | | | | | |
    | 2 | PX COORDINATOR | | | | | | | |
    | 3 | PX SEND QC (RANDOM) | :TQ10000 | 10M| 317M| 848K (1)| 00:00:27 | | |
    | 4 | LOAD AS SELECT | SYS_TEMP_0FD9D677A_286AAA2E | | | | | | |
    | 5 | PX BLOCK ITERATOR | | 10M| 317M| 848K (1)| 00:00:27 | | |
    |* 6 | TABLE ACCESS STORAGE FULL | WCRS_CLAIM_DETAIL | 10M| 317M| 848K (1)| 00:00:27 | | |
    | 7 | PX COORDINATOR | | | | | | | |
    | 8 | PX SEND QC (RANDOM) | :TQ20000 | 10M| 268M| 44875 (1)| 00:00:02 | | |
    | 9 | LOAD AS SELECT | SYS_TEMP_0FD9D677B_286AAA2E | | | | | | |
    | 10 | PX BLOCK ITERATOR | | 10M| 268M| 44875 (1)| 00:00:02 | | |
    |* 11 | TABLE ACCESS STORAGE FULL | WCRS_POLICY_DETAIL | 10M| 268M| 44875 (1)| 00:00:02 | | |
    | 12 | PX COORDINATOR | | | | | | | |
    | 13 | PX SEND QC (ORDER) | :TQ40017 | 1 | 838 | 186K (2)| 00:00:06 | | |
    | 14 | WINDOW SORT | | 1 | 838 | 186K (2)| 00:00:06 | | |
    | 15 | PX RECEIVE | | 1 | 838 | 186K (2)| 00:00:06 | | |
    | 16 | PX SEND RANGE | :TQ40016 | 1 | 838 | 186K (2)| 00:00:06 | | |
    | 17 | NESTED LOOPS | | 1 | 838 | 186K (2)| 00:00:06 | | |
    | 18 | BUFFER SORT | | | | | | | |
    | 19 | PX RECEIVE | | | | | | | |
    | 20 | PX SEND BROADCAST | :TQ40001 | | | | | | |
    | 21 | VIEW | | 1 | 13 | 93216 (2)| 00:00:03 | | |
    | 22 | SORT GROUP BY | | 1 | 393 | | | | |
    | 23 | PX COORDINATOR | | | | | | | |
    | 24 | PX SEND QC (RANDOM) | :TQ30015 | 1 | 393 | | | | |
    | 25 | SORT GROUP BY | | 1 | 393 | | | | |
    | 26 | PX RECEIVE | | 1 | 393 | | | | |
    | 27 | PX SEND HASH | :TQ30014 | 1 | 393 | | | | |
    | 28 | SORT GROUP BY | | 1 | 393 | | | | |
    |* 29 | HASH JOIN ANTI | | 1 | 393 | 93216 (2)| 00:00:03 | | |
    | 30 | PX RECEIVE | | 1 | 376 | 85197 (2)| 00:00:03 | | |
    | 31 | PX SEND HASH | :TQ30012 | 1 | 376 | 85197 (2)| 00:00:03 | | |
    | 32 | BUFFER SORT | | 1 | 838 | | | | |
    | 33 | NESTED LOOPS | | 1 | 376 | 85197 (2)| 00:00:03 | | |
    | 34 | NESTED LOOPS | | 1 | 358 | 85197 (2)| 00:00:03 | | |
    | 35 | NESTED LOOPS | | 1 | 348 | 85197 (2)| 00:00:03 | | |
    |* 36 | HASH JOIN ANTI | | 1 | 316 | 85179 (2)| 00:00:03 | | |
    | 37 | PX RECEIVE | | 4 | 1156 | 77161 (2)| 00:00:03 | | |
    | 38 | PX SEND HASH | :TQ30010 | 4 | 1156 | 77161 (2)| 00:00:03 | | |
    |* 39 | HASH JOIN ANTI BUFFERED | | 4 | 1156 | 77161 (2)| 00:00:03 | | |
    | 40 | PX RECEIVE | | 371 | 94605 | 69142 (2)| 00:00:03 | | |
    | 41 | PX SEND HASH | :TQ30008 | 371 | 94605 | 69142 (2)| 00:00:03 | | |
    |* 42 | HASH JOIN | | 371 | 94605 | 69142 (2)| 00:00:03 | | |
    | 43 | PX RECEIVE | | 350 | 77000 | 36642 (1)| 00:00:02 | | |
    | 44 | PX SEND BROADCAST | :TQ30007 | 350 | 77000 | 36642 (1)| 00:00:02 | | |
    |* 45 | HASH JOIN | | 350 | 77000 | 36642 (1)| 00:00:02 | | |
    | 46 | PX RECEIVE | | 140 | 25200 | 28624 (1)| 00:00:01 | | |
    | 47 | PX SEND BROADCAST | :TQ30006 | 140 | 25200 | 28624 (1)| 00:00:01 | | |
    |* 48 | HASH JOIN | | 140 | 25200 | 28624 (1)| 00:00:01 | | |
    | 49 | PX RECEIVE | | 140 | 22820 | 25169 (1)| 00:00:01 | | |
    | 50 | PX SEND BROADCAST | :TQ30005 | 140 | 22820 | 25169 (1)| 00:00:01 | | |
    |* 51 | HASH JOIN BUFFERED | | 140 | 22820 | 25169 (1)| 00:00:01 | | |
    | 52 | BUFFER SORT | | | | | | | |
    | 53 | PX RECEIVE | | 9 | 306 | 5 (0)| 00:00:01 | | |
    | 54 | T PX SEND BROADCAS | :TQ30000 | 9 | 306 | 5 (0)| 00:00:01 | | |
    | 55 | INDEX ROWID TABLE ACCESS BY | WCRS_POLICY_GROUPING | 9 | 306 | 5 (0)| 00:00:01 | | |
    |* 56 | AN INDEX RANGE SC | SUK3 | 9 | | 1 (0)| 00:00:01 | | |
    |* 57 | HASH JOIN | | 9699K| 1193M| 25149 (1)| 00:00:01 | | |
    | 58 | PX RECEIVE | | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 59 | PX SEND HASH | :TQ30003 | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 60 | NESTED LOOPS | | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 61 | BUFFER SORT | | | | | | | |
    | 62 | PX RECEIVE | | | | | | | |
    | 63 | DCAST PX SEND BROA | :TQ30002 | | | | | | |
    | 64 | CARTESIAN MERGE JOIN | | 1 | 14 | 13 (0)| 00:00:01 | | |
    | 65 | TERATOR PX BLOCK I | | 1 | 8 | 10 (0)| 00:00:01 | | |
    | 66 | ESS STORAGE FULL TABLE ACC | CURRENT_MED_INVC_RPT_DT | 1 | 8 | 10 (0)| 00:00:01 | | |
    | 67 | T BUFFER SOR | | 1 | 6 | 3 (0)| 00:00:01 | | |
    | 68 | E PX RECEIV | | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 69 | BROADCAST PX SEND | :TQ30001 | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 70 | K ITERATOR PX BLOC | | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 71 | ACCESS STORAGE FULL TABLE | WCRS_CURRENT_CLAIM_RPT_DT | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 72 | TOR PX BLOCK ITERA | | 9699K| 305M| 22192 (1)| 00:00:01 | KEY | KEY |
    |* 73 | STORAGE FULL TABLE ACCESS | WCRS_CURRENT_CLAIM_FACT | 9699K| 305M| 22192 (1)| 00:00:01 | KEY | KEY |
    | 74 | PX RECEIVE | | 10M| 785M| 2907 (2)| 00:00:01 | | |
    | 75 | PX SEND HASH | :TQ30004 | 10M| 785M| 2907 (2)| 00:00:01 | | |
    |* 76 | VIEW | | 10M| 785M| 2907 (2)| 00:00:01 | | |
    | 77 | TOR PX BLOCK ITERA | | 10M| 268M| 2907 (2)| 00:00:01 | | |
    | 78 | STORAGE FULL TABLE ACCESS | SYS_TEMP_0FD9D677B_286AAA2E | 10M| 268M| 2907 (2)| 00:00:01 | | |
    |* 79 | VIEW | | 10M| 168M| 3439 (2)| 00:00:01 | | |
    | 80 | PX BLOCK ITERATOR | | 10M| 317M| 3439 (2)| 00:00:01 | | |
    | 81 | E FULL TABLE ACCESS STORAG | SYS_TEMP_0FD9D677A_286AAA2E | 10M| 317M| 3439 (2)| 00:00:01 | | |
    | 82 | PX BLOCK ITERATOR | | 15M| 599M| 7994 (1)| 00:00:01 | | |
    | 83 | LL TABLE ACCESS STORAGE FU | INVC_CLAIM_DTL_BRDG_FACT | 15M| 599M| 7994 (1)| 00:00:01 | | |
    | 84 | PX BLOCK ITERATOR | | 15M| 521M| 32477 (2)| 00:00:02 | | |
    |* 85 | TABLE ACCESS STORAGE FULL | INVC_DIM | 15M| 521M| 32477 (2)| 00:00:02 | | |
    | 86 | PX RECEIVE | | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 87 | PX SEND HASH | :TQ30009 | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 88 | PX BLOCK ITERATOR | | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 89 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 90 | PX RECEIVE | | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 91 | PX SEND HASH | :TQ30011 | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 92 | PX BLOCK ITERATOR | | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 93 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 94 | TABLE ACCESS BY INDEX ROWID | INVC_ACTY_SNPSHT_FACT | 1 | 32 | 18 (0)| 00:00:01 | | |
    |* 95 | INDEX RANGE SCAN | IFK_XPKINVOICE_ACTIVITY_SNAPSH | 1 | | 1 (0)| 00:00:01 | | |
    |* 96 | INDEX UNIQUE SCAN | IFK_XPKPROVIDER_NETWORK_DIM | 1 | 10 | 0 (0)| 00:00:01 | | |
    |* 97 | INDEX RANGE SCAN | IFK_XPKALL_INVC_SNPSHT_FACT | 1 | 18 | 1 (0)| 00:00:01 | | |
    | 98 | PX RECEIVE | | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 99 | PX SEND HASH | :TQ30013 | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 100 | PX BLOCK ITERATOR | | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 101 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 102 | VIEW | | 1 | 825 | | | | |
    | 103 | SORT GROUP BY | | 1 | 430 | 93216 (2)| 00:00:03 | | |
    | 104 | BUFFER SORT | | | | | | | |
    | 105 | PX RECEIVE | | 1 | 430 | 93216 (2)| 00:00:03 | | |
    | 106 | PX SEND HASH | :TQ40015 | 1 | 430 | 93216 (2)| 00:00:03 | | |
    |*107 | HASH JOIN ANTI BUFFERED | | 1 | 430 | 93216 (2)| 00:00:03 | | |
    | 108 | PX RECEIVE | | 1 | 413 | 85198 (2)| 00:00:03 | | |
    | 109 | PX SEND HASH | :TQ40013 | 1 | 413 | 85198 (2)| 00:00:03 | | |
    | 110 | BUFFER SORT | | 1 | 838 | | | | |
    | 111 | NESTED LOOPS | | 1 | 413 | 85198 (2)| 00:00:03 | | |
    | 112 | NESTED LOOPS | | 1 | 395 | 85197 (2)| 00:00:03 | | |
    | 113 | NESTED LOOPS | | 1 | 369 | 85197 (2)| 00:00:03 | | |
    |*114 | HASH JOIN ANTI | | 1 | 311 | 85179 (2)| 00:00:03 | | |
    | 115 | PX RECEIVE | | 4 | 1136 | 77161 (2)| 00:00:03 | | |
    | 116 | PX SEND HASH | :TQ40011 | 4 | 1136 | 77161 (2)| 00:00:03 | | |
    |*117 | HASH JOIN ANTI BUFFERED | | 4 | 1136 | 77161 (2)| 00:00:03 | | |
    | 118 | PX RECEIVE | | 371 | 92750 | 69143 (2)| 00:00:03 | | |
    | 119 | PX SEND HASH | :TQ40009 | 371 | 92750 | 69143 (2)| 00:00:03 | | |
    |*120 | HASH JOIN | | 371 | 92750 | 69143 (2)| 00:00:03 | | |
    | 121 | PX RECEIVE | | 350 | 72450 | 36642 (1)| 00:00:02 | | |
    | 122 | PX SEND BROADCAST | :TQ40008 | 350 | 72450 | 36642 (1)| 00:00:02 | | |
    |*123 | HASH JOIN | | 350 | 72450 | 36642 (1)| 00:00:02 | | |
    | 124 | PX RECEIVE | | 140 | 23380 | 28624 (1)| 00:00:01 | | |
    | 125 | PX SEND BROADCAST | :TQ40007 | 140 | 23380 | 28624 (1)| 00:00:01 | | |
    |*126 | HASH JOIN | | 140 | 23380 | 28624 (1)| 00:00:01 | | |
    | 127 | PX RECEIVE | | 140 | 15540 | 25169 (1)| 00:00:01 | | |
    | 128 | PX SEND BROADCAST | :TQ40006 | 140 | 15540 | 25169 (1)| 00:00:01 | | |
    |*129 | HASH JOIN BUFFERED | | 140 | 15540 | 25169 (1)| 00:00:01 | | |
    | 130 | BUFFER SORT | | | | | | | |
    | 131 | PX RECEIVE | | 9 | 306 | 5 (0)| 00:00:01 | | |
    | 132 | PX SEND BROADCAST | :TQ40000 | 9 | 306 | 5 (0)| 00:00:01 | | |
    | 133 | ROWID TABLE ACCESS BY INDEX | WCRS_POLICY_GROUPING | 9 | 306 | 5 (0)| 00:00:01 | | |
    |*134 | INDEX RANGE SCAN | SUK3 | 9 | | 1 (0)| 00:00:01 | | |
    |*135 | HASH JOIN | | 9699K| 712M| 25149 (1)| 00:00:01 | | |
    | 136 | PX RECEIVE | | 10M| 287M| 2907 (2)| 00:00:01 | | |
    | 137 | PX SEND HASH | :TQ40004 | 10M| 287M| 2907 (2)| 00:00:01 | | |
    |*138 | VIEW | | 10M| 287M| 2907 (2)| 00:00:01 | | |
    | 139 | PX BLOCK ITERATOR | | 10M| 268M| 2907 (2)| 00:00:01 | | |
    | 140 | E FULL TABLE ACCESS STORAG | SYS_TEMP_0FD9D677B_286AAA2E | 10M| 268M| 2907 (2)| 00:00:01 | | |
    | 141 | PX RECEIVE | | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 142 | PX SEND HASH | :TQ40005 | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 143 | NESTED LOOPS | | 9699K| 434M| 22205 (1)| 00:00:01 | | |
    | 144 | BUFFER SORT | | | | | | | |
    | 145 | PX RECEIVE | | | | | | | |
    | 146 | PX SEND BROADCAST | :TQ40003 | | | | | | |
    | 147 | IAN MERGE JOIN CARTES | | 1 | 14 | 13 (0)| 00:00:01 | | |
    | 148 | R PX BLOCK ITERATO | | 1 | 8 | 10 (0)| 00:00:01 | | |
    | 149 | ORAGE FULL TABLE ACCESS ST | CURRENT_MED_INVC_RPT_DT | 1 | 8 | 10 (0)| 00:00:01 | | |
    | 150 | BUFFER SORT | | 1 | 6 | 3 (0)| 00:00:01 | | |
    | 151 | PX RECEIVE | | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 152 | AST PX SEND BROADC | :TQ40002 | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 153 | ATOR PX BLOCK ITER | | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 154 | STORAGE FULL TABLE ACCESS | WCRS_CURRENT_CLAIM_RPT_DT | 1 | 6 | 2 (0)| 00:00:01 | | |
    | 155 | PX BLOCK ITERATOR | | 9699K| 305M| 22192 (1)| 00:00:01 | KEY | KEY |
    |*156 | E FULL TABLE ACCESS STORAG | WCRS_CURRENT_CLAIM_FACT | 9699K| 305M| 22192 (1)| 00:00:01 | KEY | KEY |
    |*157 | VIEW | | 10M| 555M| 3439 (2)| 00:00:01 | | |
    | 158 | PX BLOCK ITERATOR | | 10M| 317M| 3439 (2)| 00:00:01 | | |
    | 159 | TABLE ACCESS STORAGE FULL | SYS_TEMP_0FD9D677A_286AAA2E | 10M| 317M| 3439 (2)| 00:00:01 | | |
    | 160 | PX BLOCK ITERATOR | | 15M| 599M| 7994 (1)| 00:00:01 | | |
    | 161 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 599M| 7994 (1)| 00:00:01 | | |
    | 162 | PX BLOCK ITERATOR | | 15M| 641M| 32477 (2)| 00:00:02 | | |
    |*163 | TABLE ACCESS STORAGE FULL | INVC_DIM | 15M| 641M| 32477 (2)| 00:00:02 | | |
    | 164 | PX RECEIVE | | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 165 | PX SEND HASH | :TQ40010 | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 166 | PX BLOCK ITERATOR | | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 167 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 509M| 7994 (1)| 00:00:01 | | |
    | 168 | PX RECEIVE | | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 169 | PX SEND HASH | :TQ40012 | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 170 | PX BLOCK ITERATOR | | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 171 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 404M| 7994 (1)| 00:00:01 | | |
    | 172 | TABLE ACCESS BY INDEX ROWID | INVC_ACTY_SNPSHT_FACT | 1 | 58 | 18 (0)| 00:00:01 | | |
    |*173 | INDEX RANGE SCAN | IFK_XPKINVOICE_ACTIVITY_SNAPSH | 1 | | 1 (0)| 00:00:01 | | |
    | 174 | TABLE ACCESS BY INDEX ROWID | PROVIDER_NETWORK_DIM | 1 | 26 | 0 (0)| 00:00:01 | | |
    |*175 | INDEX UNIQUE SCAN | IFK_XPKPROVIDER_NETWORK_DIM | 1 | | 0 (0)| 00:00:01 | | |
    |*176 | INDEX RANGE SCAN | IFK_XPKALL_INVC_SNPSHT_FACT | 1 | 18 | 1 (0)| 00:00:01 | | |
    | 177 | PX RECEIVE | | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 178 | PX SEND HASH | :TQ40014 | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 179 | PX BLOCK ITERATOR | | 15M| 254M| 7994 (1)| 00:00:01 | | |
    | 180 | TABLE ACCESS STORAGE FULL | INVC_CLAIM_DTL_BRDG_FACT | 15M| 254M| 7994 (1)| 00:00:01 | | |
    ---------------------------------------------------------------------------------------------------------------------------------------------------------------

  • SQL Tuning for Exadata

    Hi,
    I would like to know any SQL tuning methods specific to Oracle exadata so that they could improve the performance of the database?
    I am aware that oracle exadata runs with Oracle 11g, but i would like to know wheather there is any tuning scope w.r.t to SQL's on exadata?
    regards
    sunil

    Well there are some things that are very different about Exadata. All the standard Oracle SQL tuning you have learned already should not be forgotten as Exadata is running standard 11g database code, but there are many optimizations that have been added that you should be aware of. At a high level, if you are doing OLTP type work you should be trying to make sure that you take advantage of Exadata Smart Flash Cache which will significantly speed up your small I/O's. But long running queries are where the big benefits show up. The high level tuning approach for them is as follows:
    1. Check to see if you are getting Smart Scans.
    2. If you aren't, fix what ever is preventing them from being used.
    We've been involved in somewhere between 25-30 DB Machine installations now and in many cases, a little bit of effort changes performance dramatically. If you are only getting 2 to 3X improvement over your previous platform on these long running queries you are probably not getting the full benefit of the Exadata optimizations. So the first step is learning how to determine if you are getting Smart Scans or not and on what portions of the statement. Wait events, session statistics, V$SQL, SQL Monitoring are all viable tools that can show you that information.

  • SQL tuning suggestions.

    Hi
    I am not a sql programmer and developers have given me this sql to have a look. I made the following recommendations after going through the sql. Is there anything else that can be added . I did not add about stats because they are representative and up to date.
    SELECT /*+ PARALLEL(q1,4) */ *
    FROM
    (SELECT /*+ FIRST_ROWS(20) */
    br.resource_id,
    br.resource_code,
    x.resource_seq_num employee_resource_number,
    br.organization_id,
    bd.department_id,
    bd.department_code,
    pf.full_name employee_name,
    (SELECT xxdl_eam_util_pkg.xxdl_eam_get_resource_code(pf.person_id, bd.department_id)
    FROM dual)
    maximum_cost_resource,
    pf.person_id,
    x.wip_entity_id wo_id,
    (SELECT weo1.wip_entity_name
    FROM wip_eam_work_orders_v weo1
    WHERE weo1.wip_entity_id = x.wip_entity_id)
    wo_number,
    CAST(x.start_date AS
    TIMESTAMP) start_date,
    CAST(x.completion_date AS
    TIMESTAMP) completion_date,
    wor.operation_seq_num wo_operation_number,
    wor.resource_seq_num wo_resource_number,
    wor.usage_rate_or_amount HOURS,
    BRE.effective_start_date instance_start_date,
    BRE.effective_end_date instance_end_date,
    BRE.instance_id,
    crc.resource_rate AS
    resource_cost,
    (SELECT xxdl_eam_util_pkg.xxdl_eam_get_all_res_code(pf.person_id, bd.department_id)
    FROM dual)
    all_resources
    FROM per_all_people_f pf,
    wip_eam_work_orders_v weo,
    wip_operations wo,
    wip_operation_resources wor,
    (SELECT instance_id,
    wip_entity_id,
    operation_seq_num,
    resource_seq_num,
    start_date,
    completion_date
    FROM wip_op_resource_instances_v) x,
    bom_dept_res_instances bdri,
    bom_resource_employees BRE,
    bom_department_resources bdr,
    bom_resources br,
    cst_resource_costs crc,
    bom_departments bd
    WHERE br.organization_id = bd.organization_id
    AND bdr.resource_id = br.resource_id
    AND bdr.department_id = bd.department_id
    AND BRE.resource_id = br.resource_id
    AND pf.effective_start_date <=sysdate
    AND pf.effective_end_date >= sysdate
    AND pf.person_id = BRE.person_id
    AND wo.department_id = bd.department_id
    AND wor.operation_seq_num(+) = wo.operation_seq_num
    AND wor.wip_entity_id(+) = wo.wip_entity_id
    AND wor.organization_id(+) = wo.organization_id
    AND weo.wip_entity_id = wo.wip_entity_id
    AND weo.organization_id = wo.organization_id
    -- AND weo.organization_id = 6921
    AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
    AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
    AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
    AND crc.resource_id(+) = BRE.resource_id
    AND x.wip_entity_id = wor.wip_entity_id
    AND x.operation_seq_num = wor.operation_seq_num
    AND x.resource_seq_num = wor.resource_seq_num
    AND x.instance_id(+) = BRE.instance_id
    AND bdri.department_id = bd.department_id
    AND bdri.resource_id = br.resource_id
    AND weo.organization_id = 6921
    AND bdri.department_id = 5004
    UNION
    SELECT /*+ FIRST_ROWS(20) */ DISTINCT NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    pf.full_name employee_name,
    NULL,
    pf.person_id,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL HOURS,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
    FROM per_all_people_f pf,
    wip_eam_work_orders_v weo,
    wip_operations wo,
    wip_operation_resources wor,
    bom_dept_res_instances bdri,
    bom_resource_employees BRE,
    bom_department_resources bdr,
    bom_resources br,
    cst_resource_costs crc,
    bom_departments bd
    WHERE br.organization_id = bd.organization_id
    AND bdr.resource_id = br.resource_id
    AND bdr.department_id = bd.department_id
    AND BRE.resource_id = br.resource_id
    AND pf.effective_start_date <=sysdate
    AND pf.effective_end_date >= sysdate
    AND pf.person_id = BRE.person_id
    AND wo.department_id = bd.department_id
    AND wor.operation_seq_num(+) = wo.operation_seq_num
    AND wor.wip_entity_id(+) = wo.wip_entity_id
    AND wor.organization_id(+) = wo.organization_id
    AND weo.wip_entity_id = wo.wip_entity_id
    AND weo.organization_id = wo.organization_id
    AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
    AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
    AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
    AND crc.resource_id(+) = BRE.resource_id
    AND bdri.department_id = bd.department_id
    AND bdri.resource_id = br.resource_id
    AND weo.organization_id = 6921
    AND bdri.department_id = 5004
    AND NOT EXISTS
    (SELECT instance_id,
    wip_entity_id operation_seq_num,
    resource_seq_num
    FROM wip_op_resource_instances_v)
    ) q1
    ORDER BY department_id,
    resource_code,
    employee_name,
    wo_number
    My suggestions:
    . Try to use UNION ALL instead of UNION. If you can eliminate UNION all together and flatten the query that will be even better.
    2. You are using the function in a select statement xxdl_eam_util_pkg.xxdl_eam_get_resource_code(pf.person_id, bd.department_id)This will slow the performance. Try to get rid of this. Function calls in select are expensive.
    3. Dont use the parallel hint and optimize. It wont get you consistent results.
    4. Use of per_all_people_F is expensive. The UNION again complicates things. per_all_people_f has to be scanned 2x times.
    5. Where does the application get the values for department id? Whether user inputs a value or whether it is hard coded . Most likely user will input value and each time it may be different. If that is the case, then you may be hitting bind peeking. There is not much hope for this. Not much can be done. Whatever you do this can happen. Only way is to pin the plan if you can use literals instead of binds. But that is not possible I think.
    6. AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
    AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
    AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
    Those statements, if you can rewrite would be good. If there are indexes on any of those columns, they are more than likely not used.
    7. Are the outer joins really required. If not required remove them.
    8. There is a 'WITH' clause in 10g . Try to use that for your subqueries or main query where applicable. It will save some I/O.
    9. Try to tune without any hints. Remove the first rows as well and see the difference.
    I know that the sql is definately bad and can be rewritten but I am not able to exactly write it for them.
    Any inputs or thoughts?
    MSK

    Hi,
    Any suggestions for reading on Sql tuning
    I am looking for a practical book with solutions .
    And books showing the Sql internal workings ?Take a look on Amazon some Jonathan Lewis books.
    I will also recommend you to take a look on the following blogs:
    - http://jonathanlewis.wordpress.com/
    - http://www.juliandyke.com/
    - http://richardfoote.wordpress.com/
    - http://tkyte.blogspot.com/
    And also any good interview based good Oracle DBA books ?You can take a look on my blog for some common DBA interview questions.
    http://oraclenz.com/category/interview-tips/
    Regards,
    Francisco Munoz Alvarez
    www.oraclenz.com

  • SQL Tuning using Enterprise manager in oracle 10g

    Hi,
    In oracle 10g you have the enterprise manager which can be used to tune sql statements using the SQL Tuning ADvisor and SQL access advisor.
    I believe in oracle 10g the process of SQL Tuning is slightly easier using the Enterprise Manager ...so if some one could explain me that process...
    Again thanking you in advance
    regds
    Manoj Gokhale

    Hi Manoj,
    Didn't you already start two other threads about this same question the SQL forum?
    How do i do the SQL Statement tuning
    Enterprise Manager - sql tuning advisor , Access advisor for SQL Tuning

  • SQL tuning

    Hi All,
    I am new to tuning.
    Can somebody help me in tuning this SQL query.
    SELECT pppd.productid, pppd.sequencenumber, pppd.priceareaid, pppd.startdate, pppd.qtyfrom, pppd.enddate, pppd.price,
    pppd.articleid, pppd.customerid, pppd.distributorid, pppd.supplierid, pppd.adviceprice, pppd.customergroupid, pppd.dimensionvalue1, pppd.dimensionvalue2,
    pppd.dimensionvalue3, pppd.dimensionvalue4, pppd.dimensionvalue5, pppd.dimensionvalue6, pppd.discountpercentage,
    pppd.promotionindicator, pppd.vatindicator
    FROM PPM_PRODUCTPRICE pppd WHERE
    pppd.validindicator=1 AND pppd.startdate <= SYSDATE AND NVL(pppd.enddate,SYSDATE +1) >= SYSDATE
    AND NOT EXISTS
    (SELECT 1 FROM PPM_PRODUCTPRICE pppd2 WHERE pppd2.productid = pppd.productid
    AND NOT (pppd2.sequencenumber = pppd.sequencenumber)
    AND pppd2.priceareaid = pppd.priceareaid
    AND (NVL(pppd2.supplierid,9999999999) = NVL(pppd.supplierid,9999999999) )
    AND (NVL(pppd2.distributorid,9999999999) = NVL(pppd.distributorid,9999999999))
    AND (NVL(pppd2.customerid,9999999999) = NVL(pppd.customerid,9999999999) )
    AND (NVL(pppd2.customergroupid,9999999999) = NVL(pppd.customergroupid,9999999999))
    AND (NVL(pppd2.articleid,9999999999) = NVL(pppd.articleid,9999999999))
    AND (NVL(pppd2.dimensionvalue1,9999999999)=NVL(pppd.dimensionvalue1,9999999999))
    AND (NVL(pppd2.dimensionvalue2,9999999999)=NVL(pppd.dimensionvalue2 ,9999999999))
    AND (NVL(pppd2.dimensionvalue3,9999999999)=NVL(pppd.dimensionvalue3 ,9999999999))
    AND (NVL(pppd2.dimensionvalue4,9999999999)=NVL(pppd.dimensionvalue4 ,9999999999))
    AND (NVL(pppd2.dimensionvalue5,9999999999)=NVL(pppd.dimensionvalue5 ,9999999999))
    AND (NVL(pppd2.dimensionvalue6,9999999999)=NVL(pppd.dimensionvalue6 ,9999999999))
    AND pppd2.qtyfrom = pppd.qtyfrom AND pppd2.startdate BETWEEN pppd.startdate AND SYSDATE
    AND NVL(pppd2.enddate,SYSDATE +1) >= SYSDATE )
    AND productid= 30700

    At a minimum I think you should search the forums for SQL Tuning because I know there is some sort of sticked post identifying the GENERAL steps you should follow to tune a query. Us being here trying to help cannot tune a blanket SQL statement for the most part that is given to us. We don't know so many things that it is hard to form a cohesive answer. Some questions that arise are:
    1. What version of Oracle are you using?
    2. What are the table structures?
    3. What is the question you are truly trying to answer?
    4. What is the explain plan saying?
    5. What is your tuning goal (faster execution? lower I/O?)?
    5. etc.....
    At a minimum it appears that you are using the NVL function a lot and I would probably wager a guess that it is preventing you from using indexes on all those ID columns, if there are any.
    Hope this helps!
    Edited by: Centinul on Sep 12, 2008 12:31 PM
    Here is the link to the post I was discussing: When your query takes too long ...

  • SQL tuning for a query

    Hello Gurus,
    I have 2 tables. One with a million records and the other with 50,000 records.
    Both have an account id column. The first table contains all the customer accounts and the second table has all the bad debt accounts.
    My problem is I need to update the status column in the first table for all the bad debt records from the second table.
    As I’m still a beginner in SQL tuning, can someone please help me write this query effi ciently considering the table sizes.
    tables description:
    SQL> desc customer
    Name Null? Type
    ACNTNO NUMBER(8)
    STATUS VARCHAR2(6)
    SQL> desc badcustomer
    Name Null? Type
    ACNTNO NUMBER(8)
    The sql I could come up with is:
    update customer outer
    set status='closed'
    where acntno exists (select 'X'
    from badcustomer
    where acntno=outer.acntno);
    Thanks for taking time to read this post.

    To post formatted code, put the {noformat} {noformat}- tag before and after your examples.
    When you post:
    {noformat} select *
    from dual;
    {noformat}
    it will appear as: select *
    from dual;
    on the forum.
    The FAQ will tell you more: http://forums.oracle.com/forums/help.jspa                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

  • 1Z0-117: Oracle Database 11g Release 2: SQL Tuning Need Materia and Dumps

    Hi all,
    We are preparing for 1Z0-117: Oracle Database 11g Release 2: SQL Tuning, There is shortage of material available on net.
    Can anybody please provide books or Sample question answers and share more idea about the exan.
    mail id XXXXXXXXXXXXX
    Thanks in Advance
    Sandeep
    Edited by: 1005555 on 13 May, 2013 4:54 AM+
    Mod: email deleted, don't draw discussion away from the forum.
    Edited by: PhHein on 13.05.2013 14:16
    Edited by: 1005555 on 13 May, 2013 10:16 PM

    We are preparing for 1Z0-117: Oracle Database 11g Release 2: SQL Tuning, There is shortage of material available on net.There are actually a fair number of articles about the material covered on 117 on the net, but yes, the test is new enough that cheaters have not had much of a chance to email around illegal material such as dumps yet.
    Can anybody please provide books or Dumps and share more idea about the exan.There is a significant amount of legitimate material you can use to study for the exam here:
    http://www.oraclecertificationprep.com/apex/f?p=OCPSG:EXAM_DETAILS:0::NO::P2_EXAM:1Z0-117
    As for ideas about the exam -- it's probably the hardest Oracle certification exam I have ever taken:
    http://ocprep.blogspot.com/2013/03/1z0-117-this-exam-is-rough.html

  • SQL Tuning and OPTIMIZER - Execution Time with  " AND col .."

    Hi all,
    I get a question about SQL Tuning and OPTIMIZER.
    There are three samples with EXPLAIN PLAN and execution time.
    This "tw_pkg.getMaxAktion" is a PLSQL Package.
    1.) Execution Time : 0.25 Second
    2.) Execution Time : 0.59 Second
    3.) Execution Time : 1.11 Second
    The only difference is some additional "AND col <> .."
    Why is this execution time growing so strong?
    Many Thanks,
    Thomas
    ----[First example]---
    Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
    Connected as dbadmin2
    SQL>
    SQL> EXPLAIN PLAN FOR
      2  SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
      3                    FROM studie
      4                 ) max_aktion
      5  WHERE max_aktion.max_aktion_id < 900 ;
    Explained
    SQL> SELECT * FROM TABLE(dbms_xplan.display);
    PLAN_TABLE_OUTPUT
    Plan hash value: 3201460684
    | Id  | Operation            | Name        | Rows  | Bytes | Cost (%CPU)| Time
    |   0 | SELECT STATEMENT     |             |   220 |   880 |     5  (40)| 00:00:
    |*  1 |  INDEX FAST FULL SCAN| SYS_C005393 |   220 |   880 |     5  (40)| 00:00:
    Predicate Information (identified by operation id):
       1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900)
    13 rows selected
    SQL>
    Execution time (PL/SQL Developer says): 0.25 seconds
    ----[/First]---
    ----[Second example]---
    Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
    Connected as dbadmin2
    SQL>
    SQL> EXPLAIN PLAN FOR
      2  SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
      3                    FROM studie
      4                 ) max_aktion
      5  WHERE max_aktion.max_aktion_id < 900
      6    AND max_aktion.max_aktion_id <> 692;
    Explained
    SQL> SELECT * FROM TABLE(dbms_xplan.display);
    PLAN_TABLE_OUTPUT
    Plan hash value: 3201460684
    | Id  | Operation            | Name        | Rows  | Bytes | Cost (%CPU)| Time
    |   0 | SELECT STATEMENT     |             |    11 |    44 |     6  (50)| 00:00:
    |*  1 |  INDEX FAST FULL SCAN| SYS_C005393 |    11 |    44 |     6  (50)| 00:00:
    Predicate Information (identified by operation id):
       1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900 AND
                  "TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>692)
    14 rows selected
    SQL>
    Execution time (PL/SQL Developer says): 0.59 seconds
    ----[/Second]---
    ----[Third example]---
    SQL> EXPLAIN PLAN FOR
      2  SELECT * FROM ( SELECT studie_id, tw_pkg.getMaxAktion(studie_id) AS max_aktion_id
      3                    FROM studie
      4                 ) max_aktion
      5  WHERE max_aktion.max_aktion_id < 900
      6    AND max_aktion.max_aktion_id <> 692
      7    AND max_aktion.max_aktion_id <> 392;
    Explained
    SQL> SELECT * FROM TABLE(dbms_xplan.display);
    PLAN_TABLE_OUTPUT
    Plan hash value: 3201460684
    | Id  | Operation            | Name        | Rows  | Bytes | Cost (%CPU)| Time
    |   0 | SELECT STATEMENT     |             |     1 |     4 |     6  (50)| 00:00:
    |*  1 |  INDEX FAST FULL SCAN| SYS_C005393 |     1 |     4 |     6  (50)| 00:00:
    Predicate Information (identified by operation id):
       1 - filter("TW_PKG"."GETMAXAKTION"("STUDIE_ID")<900 AND
                  "TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>692 AND
                  "TW_PKG"."GETMAXAKTION"("STUDIE_ID")<>392)
    15 rows selected
    SQL>
    Execution time (PL/SQL Developer says): 1.11 seconds
    ----[/Third]---Edited by: thomas_w on Jul 9, 2010 11:35 AM
    Edited by: thomas_w on Jul 12, 2010 8:29 AM

    Hi,
    this is likely because SQL Developer fetches and displays only limited number of rows from query results.
    This number is a parameter called 'sql array fetch size', you can find it in SQL Developer preferences under Tools/Preferences/Database/Advanced tab, and it's default value is 50 rows.
    Query scans a table from the beginning and continue scanning until first 50 rows are selected.
    If query conditions are more selective, then more table rows (or index entries) must be scanned to fetch first 50 results and execution time grows.
    This effect is usually unnoticeable when query uses simple and fast built-in comparison operators (like = <> etc) or oracle built-in functions, but your query uses a PL/SQL function that is much more slower than built-in functions/operators.
    Try to change this parameter to 1000 and most likely you will see that execution time of all 3 queries will be similar.
    Look at this simple test to figure out how it works:
    CREATE TABLE studie AS
    SELECT row_number() OVER (ORDER BY object_id) studie_id,  o.*
    FROM (
      SELECT * FROM all_objects
      CROSS JOIN
      (SELECT 1 FROM dual CONNECT BY LEVEL <= 100)
    ) o;
    CREATE INDEX studie_ix ON studie(object_name, studie_id);
    ANALYZE TABLE studie COMPUTE STATISTICS;
    CREATE OR REPLACE FUNCTION very_slow_function(action IN NUMBER)
    RETURN NUMBER
    IS
    BEGIN
      RETURN action;
    END;
    /'SQL array fetch size' parameter in SQLDeveloper has been set to 50 (default). We will run 3 different queries on test table.
    Query 1:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id < 900
    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      1.22       1.29          0       1310          0          50
    total        3      1.22       1.29          0       1310          0          50
    Misses in library cache during parse: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
         50  INDEX FAST FULL SCAN STUDIE_IX (cr=1310 pr=0 pw=0 time=355838 us cost=5536 size=827075 card=165415)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
         50   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 2:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id < 900
          AND max_aktion.max_aktion_id > 800
    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      8.40       8.62          0       9351          0          50
    total        3      8.40       8.64          0       9351          0          50
    Misses in library cache during parse: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
         50  INDEX FAST FULL SCAN STUDIE_IX (cr=9351 pr=0 pw=0 time=16988202 us cost=5552 size=41355 card=8271)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
         50   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 3:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id = 600
    call     count       cpu    elapsed       disk      query    current        rows
    Parse        1      0.01       0.00          0          0          0           0
    Execute      1      0.00       0.00          0          0          0           0
    Fetch        1     18.72      19.16          0      19315          0           1
    total        3     18.73      19.16          0      19315          0           1
    Misses in library cache during parse: 1
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
          1  INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=0 us cost=5536 size=165415 card=33083)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
          1   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 1 - 1,29 sec, 50 rows fetched, 1310 index entries scanned to find these 50 rows.
    Query 2 - 8,64 sec, 50 rows fetched, 9351 index entries scanned to find these 50 rows.
    Query 3 - 19,16 sec, only 1 row fetched, 19315 index entries scanned (full index).
    Now 'SQL array fetch size' parameter in SQLDeveloper has been set to 1000.
    Query 1:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id < 900
    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     18.35      18.46          0      19315          0         899
    total        3     18.35      18.46          0      19315          0         899
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
        899  INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=20571272 us cost=5536 size=827075 card=165415)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
        899   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 2:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id < 900
          AND max_aktion.max_aktion_id > 800
    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     18.79      18.86          0      19315          0          99
    total        3     18.79      18.86          0      19315          0          99
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
         99  INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=32805696 us cost=5552 size=41355 card=8271)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
         99   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)Query 3:
    SELECT * FROM ( SELECT studie_id, very_slow_function(studie_id) AS max_aktion_id
                         FROM studie
                  ) max_aktion
    WHERE max_aktion.max_aktion_id = 600
    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     18.69      18.84          0      19315          0           1
    total        3     18.69      18.84          0      19315          0           1
    Misses in library cache during parse: 0
    Optimizer mode: ALL_ROWS
    Parsing user id: 93  (TEST)
    Rows     Row Source Operation
          1  INDEX FAST FULL SCAN STUDIE_IX (cr=19315 pr=0 pw=0 time=0 us cost=5536 size=165415 card=33083)(object id 79865)
    Rows     Execution Plan
          0  SELECT STATEMENT   MODE: ALL_ROWS
          1   INDEX   MODE: ANALYZED (FAST FULL SCAN) OF 'STUDIE_IX' (INDEX)And now:
    Query 1 - 18.46 sec, 899 rows fetched, 19315 index entries scanned.
    Query 2 - 18.86 sec, 99 rows fetched, 19315 index entries scanned.
    Query 3 - 18.84 sec, 1 row fetched, 19315 index entries scanned.

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