DOMAIN INDEX

Description

Selects from a domain index.

Versions

This operation is implemented in the following versions

Example

This example demonstrates a DOMAIN INDEX operation on a Oracle Text index. In Oracle 9.2, Oracle Text is installed by DBCA. Alternatively it can be installed manually by running the $ORACLE_HOME/ctx/admin/dr0inst.sql script

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 PRIMARY KEY,
      c2 VARCHAR2(30)
    );

    INSERT INTO t1 VALUES (1,'One');
    INSERT INTO t1 VALUES (2,'Two');
    INSERT INTO t1 VALUES (3,'Three');

    COMMIT;

    CREATE INDEX i1 ON t1 (c2)
    INDEXTYPE IS CTXSYS.CONTEXT;

The table does not need to be analysed

The statement

    SELECT c1 
    FROM t1
    WHERE CONTAINS (c2,'Two') > 0;

generates the following execution plan

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   TABLE ACCESS (BY INDEX ROWID) OF 'T1'
2   1     DOMAIN INDEX OF 'I1'