Tag: partition

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OracleDB12c New Feature: Adding, Dropping, Truncating Multiple Partitions

Yesterday, we discussed merging and splitting multiple partitions. The same feature is extended in 12c to add, drop or truncate multiple partitions in a single SQL statement.

Add multiple partitions example:

ALTER TABLE SALESDATA ADD
PARTITION S2015Q1 VALUES LESS THAN (TO_DATE('01-APR-15','DD-MON-YY')),
PARTITION S2015Q2 VALUES LESS THAN (TO_DATE('01-JUL-15','DD-MON-YY')),
PARTITION S2015Q3 VALUES LESS THAN (TO_DATE('01-OCT-15','DD-MON-YY')),
PARTITION S2015Q4 VALUES LESS THAN (TO_DATE('01-JAN-16','DD-MON-YY'));

Read more in Oracle Documentation

 

Truncate multiple partitions example:

ALTER TABLE SALESDATA TRUNCATE PARTITIONS 
S2001Q1, S2001Q2, S2001Q3, S2001Q4;

Read more in Oracle Documentation

 

Drop multiple partitions example:

ALTER TABLE SALESDATA DROP PARTITIONS 
S2001Q1, S2001Q2, S2001Q3, S2001Q4;

Read more in Oracle Documentation

 

 

 

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OracleDB12c New Feature: Merging and Splitting Multiple Partitions

In Oracle11g, you can merge or split two partitions. This feature is enhanced in 12c to merge and split multiple partitions in a single SQL thus reducing the maintenance operations. When merging range partitions, they must be adjacent.

Merging Partitions Example:

ALTER TABLE SALESDATA
MERGE PARTITIONS S2012Q1, S2012Q2, S2012Q3, S2012Q4 INTO S2012;

If range partitions are merged, you may use the “TO” clause.

ALTER TABLE SALESDATA
MERGE PARTITIONS S2012Q1 TO S2012Q4 INTO S2012;

Read more about this feature and restrictions in Oracle Documentation.

Splitting Partitions Example:

ALTER TABLE SALESDATA SPLIT PARTITION S2014 INTO
(PARTITION S2014Q1 VALUES LESS THAN TO_DATE('01-APR-14','DD-MON-YY')),
(PARTITION S2014Q2 VALUES LESS THAN TO_DATE('01-JUL-14','DD-MON-YY')),
(PARTITION S2014Q3 VALUES LESS THAN TO_DATE('01-OCT-14','DD-MON-YY')),
(PARTITION S2014Q4 );

Read more in Oracle Documentation