INDEX (SAMPLE FAST FULL SCAN)

Description

Perform an index fast full scan on a sample of rows

Versions

This operation was introduced in Oracle 8.1.6

This operation is implemented in the following versions

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 NOT NULL);

    CREATE INDEX i1 ON t1 (c1);

The table does not need to be analysed

The statement

    SELECT /*+ INDEX_FFS (t1 i1) */ c1
    FROM t1 SAMPLE (10);

generates the following execution plan

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