BITMAP INDEX (RANGE SCAN)

Description

Returns rows in a bitmap for a range of key values

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 and index definitions 

    CREATE TABLE t1 (c1 NUMBER,c2 NUMBER);

    CREATE BITMAP INDEX i1 ON t1 (c1);

The table does not need to be analysed. NOT NULL constraints are not required for the indexed column(s) as bitmap indexes include a bitmap for NULL values

The statement 

    SELECT /*+ INDEX (t1 i1) */ c1 FROM t1
    WHERE c1 < 1;

generates the following execution plan 

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   BITMAP CONVERSION (TO ROWIDS)
2   1     BITMAP INDEX (RANGE SCAN) OF 'I1'