Re: Index not used

There is no predicate for tab2, the smallest of the three tables, apart from the join predicate. Are there usable indexes on tab1.type and tab3.start_date? Any changes if you add the transitive closure predicate (the optimizer does not do this (yet)):
t1.id = t2.id and t2.id = t3.id => t1.id = t3.id It opens additional access paths.

Quoting Ranko Mosic <ranko.mosic_at_gmail.com>:

> Hi List,
>
> SELECT *
> 2 FROM tab1 t1 ,
> 3 tab2 t2 ,
> 4 tab3 t3
> 5 WHERE t1.id = t2.id
> 6 AND t2.id = t3.id
> 7 AND t1.type IN
> 8 ('A','B','C')
> 9 AND t3.type = 'A'
> 10* AND t3.start_date = '01-APR-2004'
>
> All join cols are indexed on leading cols. There is FTS on t2 . Stats are
> fresh and computed .
> Why FTS on t2 ? ( v 9.2 ).
> --
> Regards,
> Ranko Mosic
> Contract Senior Oracle DBA
> B. Eng, Oracle 10g, 9i Certified Database Professional
> Phone: 416-450-2785
> email: mosicr_at_rogers.com
>

http://ca.geocities.com/mosicr@rogers.com/ContractSeniorOracleDBARankoMosicMain.html
>

-- 
regards

Wolfgang Breitling
Oracle 7,8,8i,9i OCP DBA
Centrex Consulting Corporation
www.centrexcc.com

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