Michael Fuhr wrote:
* Improve the optimizer's selectivity estimates for LIKE, ILIKE,
and regular expression operations (Tom)
On Fri, Mar 30, 2007 at 04:46:11AM -0600, Michael Fuhr wrote:
Have you tried increasing the statistics target on l_pvcp.value?
I ran your queries against canned data in 8.2.3 and better statistics
resulted in more accurate row count estimates for this and other
parts of the plan. I don't recall if estimates for non-leading-character
matches in earlier versions can benefit from better statistics.
This might work only in 8.2. I see the following in the Release Notes:Have you tried increasing the statistics target on l_pvcp.value?
I ran your queries against canned data in 8.2.3 and better statistics
resulted in more accurate row count estimates for this and other
parts of the plan. I don't recall if estimates for non-leading-character
matches in earlier versions can benefit from better statistics.
* Improve the optimizer's selectivity estimates for LIKE, ILIKE,
and regular expression operations (Tom)
I will try same select on a 8.2 ( that one was a 8.1 ) and I'll let you
know.
Regards
Gaetano Mendola
