PX PARTITION LIST (ALL)

Description

Parallel execution - iterate over all list partitioned table

Versions

This operation is implemented in the following versions

Example

This example was developed using Oracle 10.2.0.1 on Linux

This example requires the following table definitions

    CREATE TABLE t1
    (
      c1 NUMBER,
      c2 NUMBER,
      c3 NUMBER,
      c4 CHAR (100)
    )
    PARTITION BY LIST (c1)
    (
      PARTITION p1 VALUES (1,2),
      PARTITION p2 VALUES (3,4),
      PARTITION p3 VALUES (5,6),
      PARTITION p4 VALUES (6,8)
    );

    CREATE TABLE t2
    (
      c1 NUMBER,
      c2 NUMBER,
      c3 NUMBER,
      c4 CHAR (100)
    )
    PARTITION BY LIST (c1)
    (
      PARTITION p1 VALUES (1,2),
      PARTITION p2 VALUES (3,4),
      PARTITION p3 VALUES (5,6),
      PARTITION p4 VALUES (6,8)
    );

The statement

    SELECT /*+ PARALLEL (t1,4) */ t2.c2
    FROM t1,t2
    WHERE t1.c1 = t2.c1;

generates the following execution plan

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   PX COORDINATOR
2   1     PX SEND (QC (RANDOM))
3   2       HASH JOIN
4   3         PX PARTITION LIST (ALL)
5   4           TABLE ACCESS (FULL) OF 'T1'
6   3         BUFFER (SORT)
7   6           PX RECEIVE
8   7             PX SEND (PARTITION (KEY))
9   8               PARTITION LIST (ALL)
10  9                 TABLE ACCESS (FULL) OF 'T2'