PartKey

Question

Hi,
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
I have two issues:
1. Drop partitioning key from the existing partitioning key columns i.e. multi-key to single key. The table given below is an existing table which is partitioned on BD and FD, now, i need to drop one partitioning key column and just need one key i.e. BD. What is safe and quick way to do it without any data lose.
Example:
CREATE TABLE "T_R_TMP"
(     "R_TMP_SID" NUMBER(20,0) ,
     "FSID" NUMBER(20,0) ,
     "BD" DATE ,
FD Date,
     "PN" NUMBER(38,0) ,
     "FC" VARCHAR2(6) ,
     "RT" TIMESTAMP (6) ,      
     "CUSR_ID" VARCHAR2(8) ,      
     "UUSR_ID" VARCHAR2(8))
PARTITION BY RANGE (BD, FD)
( PARTITION S1 VALUES LESS THAN ( TO_DATE('22/12/2005','DD/MM/YYYY'),TO_DATE('22/12/2005','DD/MM/YYYY'))
TABLESPACE TB01,
PARTITION S2 VALUES LESS THAN ( TO_DATE('07/01/2009','DD/MM/YYYY'), TO_DATE('07/01/2009','DD/MM/YYYY'))
TABLESPACE TB02,
PARTITION S3 VALUES LESS THAN (TO_DATE('10/01/2009','DD/MM/YYYY'),TO_DATE('10/01/2009','DD/MM/YYYY'))
TABLESPACE TB03,
PARTITION S4 VALUES LESS THAN (TO_DATE('13/01/2009','DD/MM/YYYY'),TO_DATE('13/01/2009','DD/MM/YYYY'))
TABLESPACE TB04,
PARTITION S5 VALUES LESS THAN (MAXVALUE, MAXVALUE)
TABLESPACE TB05
2. How can I change the max bound date on the each partition. for example:
CREATE TABLE "T_R_TMP"
(     "R_TMP_SID" NUMBER(20,0) ,
     "FSID" NUMBER(20,0) ,
     "BD" DATE ,
FD Date,
     "PN" NUMBER(38,0) ,
     "FC" VARCHAR2(6) ,
     "RT" TIMESTAMP (6) ,      
     "CUSR_ID" VARCHAR2(8) ,      
     "UUSR_ID" VARCHAR2(8))
PARTITION BY RANGE (BD)
( PARTITION S1 VALUES LESS THAN ( TO_DATE('22/12/2005','DD/MM/YYYY'))
TABLESPACE TB01,
PARTITION S2 VALUES LESS THAN ( TO_DATE('07/01/2009','DD/MM/YYYY'))
TABLESPACE TB02,
PARTITION S3 VALUES LESS THAN (TO_DATE('10/01/2009','DD/MM/YYYY'))
TABLESPACE TB03,
PARTITION S4 VALUES LESS THAN (TO_DATE('13/01/2009','DD/MM/YYYY'))
TABLESPACE TB04,
PARTITION S5 VALUES LESS THAN ( MAXVALUE)
TABLESPACE TB05
I need to chnage the max boundry for parition "S1" from TO_DATE('22/12/2005','DD/MM/YYYY') to TO_DATE('30/01/2006','DD/MM/YYYY')
Please suggest....
Edited by: user8650395 on Mar 29, 2011 8:52 PM

Answer 1

Hi,
As far as I know there is no simple way of achieving this.
If, and only if, the condition BD >= FD is allways true, you could use partition exchange to do it.
1) Create a new table (called T_R_TMP_NEW) with the correct partitions and the same columns and local indexes as the existing table T_R_TMP.
2) Create a new normal table (called TMP) with the same columns and local indexes as T_R_TMP.
3) Exchange the partition 1 of T_R_TMP with table TMP. Exchange table TMP with the partition 1 of table T_R_TMP_NEW. Do the same for the 2nd, 3rd and 4th partition.
4) Rename T_R_TMP to T_R_TMP_OLD and T_R_TMP_NEW to T_R_TMP.
5) Gather global stats for the new table T_R_TMP.
6) Recreate the global index for the new T_R_TMP table. Recreate the constraints related to the table T_R_TMP.
7) Grant the required privileges for the new table T_R_TMP and recompile all PLSQL Objects referencing the table
Regards
Maurice