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function based indexes

function based indexes

2004-08-13       - By Niall Litchfield

Reply:     1     2     3     4     5     6     7  

On Thu, 12 Aug 2004 19:21:06 -0600, Tim Gorman <tim@(protected) > wrote:

> The hoops to be jumped through to enable FBI are:
>
> 1. COMPATIBLE >= 8.1.0
> 2. OPTIMIZER_MODE < > rule
> 3. QUERY_REWRITE_ENABLED = true
> 4. QUERY REWRITE or GLOBAL QUERY REWRITE permission granted
> 5. CBO statistics gathered on the index

This is version specific and no longer true.

SYS 13-AUG-2004 09:59@(protected) >select grantee from dba_sys_privs
2 where privilege = 'QUERY REWRITE ';

GRANTEE
-- ---- ---- ---- ---- ---- --
DBA
SYS
XDB
MDSYS
WKSYS
CTXSYS

6 rows selected.

SYS 13-AUG-2004 10:00@(protected) >select name,value
2 from v$parameter
3 where name in ( 'compatible ', 'optimizer_mode ', 'query_rewrite_enabled ');

NAME VALUE
-- ---- ---- ---- ---- ---- -- -- ---- ---- ---- ---- ---- --
compatible 9.2.0.0.0
optimizer_mode CHOOSE
query_rewrite_enabled FALSE

3 rows selected.

SYS 13-AUG-2004 10:00@(protected) >CONN TACACS@(protected)
Enter password:
ERROR:
ORA-01017 (See ORA-01017.ora-code.com): invalid username/password; logon denied


Warning: You are no longer connected to ORACLE.
13-AUG-2004 10:01@ >CONN TACACS@(protected)
Enter password:
Connected.
TACACS 13-AUG-2004 10:01@(protected) >CREATE TABLE EMP(ENO,ENAME)
2 AS SELECT OBJECT_ID,OBJECT_NAME FROM ALL_OBJECTS;

Table created.

TACACS 13-AUG-2004 10:03@(protected) >CREATE INDEX IDX_UPPER_ENAME
2 ON EMP(UPPER(ENAME));

Index created.

TACACS 13-AUG-2004 10:03@(protected) >EXEC
DBMS_STATS.GATHER_TABLE_STATS(USER, 'EMP ',CASCADE = > TRUE);

PL/SQL procedure successfully completed.

TACACS 13-AUG-2004 10:04@(protected) >EXPLAIN PLAN
2 FOR SELECT ENO FROM EMP
3 WHERE UPPER(ENAME) = 'SEG$ ';

Explained.

TACACS 13-AUG-2004 10:04@(protected) >@(protected)

PLAN_TABLE_OUTPUT
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --

-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
-- --

| Id | Operation | Name | Rows | Bytes | Cost (%
CPU)|

-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
-- --

| 0 | SELECT STATEMENT | | 2 | 62 | 4

PLAN_TABLE_OUTPUT
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
(25)|

| 1 | TABLE ACCESS BY INDEX ROWID| EMP | 2 | 62 | 4
(25)|

|* 2 | INDEX RANGE SCAN | IDX_UPPER_ENAME | 2 | | 2
(50)|

-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --
-- --


PLAN_TABLE_OUTPUT
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- --

Predicate Information (identified by operation id):
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---

2 - access(UPPER( "EMP ". "ENAME ")= 'SEG$ ')

13 rows selected.

TACACS 13-AUG-2004 10:05@(protected) >

And to show that TACACS is not a DBA -- I 'm not showing you the dba accounts

TACACS 13-AUG-2004 10:08@(protected) >SELECT TABLE_NAME FROM DBA_TABLES;
SELECT TABLE_NAME FROM DBA_TABLES
*
ERROR at line 1:
ORA-00942 (See ORA-00942.ora-code.com): table or view does not exist

This is 9204 std edition. I suspect, but haven 't tested that
compatible has to be set to 9.2 for this to work.


--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com
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