ALTER TABLE...SPLIT SUBPARTITION v12

Use the ALTER TABLE… SPLIT SUBPARTITION command to divide a single subpartition into two subpartitions, and redistribute the subpartition's contents. The command comes in two variations.

The first variation splits a range subpartition into two subpartitions:

ALTER TABLE <table_name> SPLIT SUBPARTITION <subpartition_name>
  AT (range_part_value)
  INTO
  (
    SUBPARTITION <new_subpart1>
      [TABLESPACE <tablespace_name>],
    SUBPARTITION <new_subpart2>
      [TABLESPACE <tablespace_name>]
  );

The second variation splits a list subpartition into two subpartitions:

ALTER TABLE <table_name> SPLIT SUBPARTITION <subpartition_name>
  VALUES (<value>[, <value>]...)
  INTO
  (
    SUBPARTITION <new_subpart1>
      [TABLESPACE <tablespace_name>],
    SUBPARTITION <new_subpart2>
      [TABLESPACE <tablespace_name>]
  );

Description

The ALTER TABLE...SPLIT SUBPARTITION command adds a subpartition to an existing subpartitioned table. There is no upper limit to the number of defined subpartitions. When you execute an ALTER TABLE...SPLIT SUBPARTITION command, Advanced Server creates two new subpartitions, moving any rows that contain values that are constrained by the specified subpartition rules into new_subpart1, and any remaining rows into new_subpart2.

The new subpartition rules must reference the column specified in the rules that define the existing subpartition(s).

Include the TABLESPACE clause to specify a tablespace in which a new subpartition will reside. If you do not specify a tablespace, the subpartition will be created in the default tablespace.

If the table is indexed, the index will be created on the new subpartition.

To use the ALTER TABLE... SPLIT SUBPARTITION command you must be the table owner, or have superuser (or administrative) privileges.

Parameters

table_name

The name (optionally schema-qualified) of the partitioned table.

subpartition_name

The name of the subpartition that is being split.

new_subpart1

The name of the first new subpartition to be created. Subpartition names must be unique amongst all partitions and subpartitions, and must follow the naming conventions for object identifiers.

new_subpart1 will receive the rows that meet the subpartitioning constraints specified in the ALTER TABLE… SPLIT SUBPARTITION command.

new_subpart2

The name of the second new subpartition to be created. Subpartition names must be unique amongst all partitions and subpartitions, and must follow the naming conventions for object identifiers.

new_subpart2 will receive the rows are not directed to new_subpart1 by the subpartitioning constraints specified in the ALTER TABLE… SPLIT SUBPARTITION command.

(value[, value]...)

Use value to specify a quoted literal value (or comma-delimited list of literal values) by which table entries will be grouped into partitions. Each partitioning rule must specify at least one value, but there is no limit placed on the number of values specified within a rule. value may also be NULL, DEFAULT (if specifying a LIST subpartition), or MAXVALUE (if specifying a RANGE subpartition).

For information about creating a DEFAULT or MAXVALUE partition, see Handling Stray Values in a LIST or RANGE Partitioned Table.

tablespace_name

The name of the tablespace in which the partition or subpartition resides.