PARTITION HASH (SINGLE)

Description

Executes child operations for a single partition in the table

Versions

This operation was introduced in Oracle 8.1.5

This operation is implemented in the following versions

8.1.5
8.1.6
8.1.7
9.0.1
9.2.0
10.1.0
10.2.0

Example

This example was developed using Oracle 9.2.0.1 on Windows 2000

This example requires the following table definition 

    CREATE TABLE t1 (c1 NUMBER,c2 NUMBER)
    PARTITION BY HASH (c1)
    PARTITIONS 4;

The table does not need to be analysed

The statement 

    SELECT c1 FROM t1
    WHERE c1 = 
    (
      SELECT MIN (c1) FROM t1
    );

generates the following execution plan 

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   PARTITION HASH (SINGLE)
2   1     TABLE ACCESS (FULL) OF 'T1'
3   2       SORT (AGGREGATE)
4   3         PARTITION HASH (ALL)
5   4           TABLE ACCESS (FULL) OF 'T1'