TABLE ACCESS (HASH)

Description

Accesses row in clustered tables based on hashed cluster key

Versions

This operation is implemented in the following versions

7.3.4
8.0.4
8.0.5
8.0.6
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 CLUSTER cl1 (c1 NUMBER) HASHKEYS 100;

    CREATE TABLE t1 (c1 NUMBER,c2 NUMBER) CLUSTER cl1 (c1);

The table does not need to be analysed

The statement

    SELECT c2 FROM t1
    WHERE c1 = 0;

generates the following execution plan

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   TABLE ACCESS (HASH) OF 'T1'