 | | | function based indexes | function based indexes 2004-08-12 - By Tim Gorman
The setting of the parameter QUERY_REWRITE_INTEGRITY has no bearing on
anything but query rewrite in materialized views...
SQL > create index initcap_ename on emp(initcap(ename)) compute statistics;
Index created.
SQL > show parameter rewrite
NAME TYPE VALUE
-- ---- ---- ---- ---- ---- -- ---- --- -- ---- ---- --
query_rewrite_enabled string TRUE
query_rewrite_integrity string STALE_TOLERATED
SQL > set autotrace traceonly explain
SQL > select ename from emp where initcap(ename) = 'Smith ';
Execution Plan
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- -----
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'EMP '
2 1 INDEX (RANGE SCAN) OF 'INITCAP_ENAME ' (NON-UNIQUE)
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
Hope this helps...
-Tim
on 8/11/04 8:20 PM, Mohammed Shakir at mshakir08816@(protected) wrote:
> I had to do the following to get function based indexes working.
> But I have Oracle 9i. You can check 10g documentation to confirm.
>
> You must have the following initialization parameters defined to create
> a function-based index:
>
> QUERY_REWRITE_INTEGRITY must be set to TRUSTED
>
> QUERY_REWRITE_ENABLED must be set to TRUE
>
> COMPATIBLE must set to 8.1.0.0.0 or a greater value
>
>
> Shakir
>
>
> --- Harvinder Singh <Harvinder.Singh@(protected) > wrote:
>
> > Hi,
> >
> > We are creating function based indexes and have question about parameter
> > query_rewrite_integrity. Docs says value for this parameter should be
> > trusted to be able to use FBT but even when I set this parameter setting
> > to ENFORCED, optimizer is able to use index. So what should be the value
> > of this parameter to be able to use function based indexes?
> > We are using 10g on red hat linux
> >
> > Thanks
> > --Harvinder
>
>
> =====
> Mohammed Shakir
> CompuSoft, Inc.
> 11 Heather Way
> East Brunswick, NJ 08816-2825
> (732) 672-0464 (Cell)
> (732) 257-6001 (Home)
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