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Re: multi column query
- From: "Jim C. Nasby" <jnasby(at)pervasive(dot)com>
- To: Sriram Dandapani <sdandapani(at)counterpane(dot)com>
- Cc: pgsql-performance(at)postgresql(dot)org
- Subject: Re: multi column query
- Date: Wed, 12 Apr 2006 19:43:41 -0500
On Wed, Apr 12, 2006 at 05:32:32PM -0700, Sriram Dandapani wrote: > Hi > > When I update a table that has 20 columns and the where clause includes > 16 of the columns (this is a data warehousing type update on aggregate > fields), > > The bitmap scan is not used by the optimizer. The table is indexed on 3 > of the 20 fields. The update takes really long to finish (on a 6 million > row table) > > Do I need to do some "magic" with configuration to turn on bitmap scans. No. What's explain analyze of the query show? What's it doing now? Seqscan? You might try set enable_seqscan=off and see what that does. -- Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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