On 18 February 2010 11:55, AI Rumman <rumman...@gmail.com> wrote:
> "Not like" operation does not use index.
>
> select * from vtiger_contactscf where lower(cf_1253) not like
> lower('Former%')
>
> I created index on lower(cf_1253).
>
> How can I ensure index usage in not like operation?
> Anyone please help.
>How many rows do you have in your table? If there are relatively few, it probably guesses it to be cheaper to do a sequential scan and calculate lower values on-the-fly rather than bother with the index. Thom -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
