INDEX (SKIP SCAN)

Description

Perform an index skip scan

Versions

This operation was introduced in Oracle 9.0.1

This operation is implemented in the following versions

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);

    CREATE INDEX i1 ON t1 (c1,c2);

The table does not need to be analysed

The statement

    SELECT /*+ INDEX_SS (t1 i1) */ c1
    FROM t1
    WHERE c2 = 0;

generates the following execution plan

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   INDEX (SKIP SCAN) OF 'I1' (NON-UNIQUE)