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Re: [HACKERS] functions to obtain query plan
- From: Michael Glaesemann <grzm(at)seespotcode(dot)net>
- To: "sharath kumar" <k(dot)sharat(at)gmail(dot)com>
- Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-general <pgsql-general(at)postgresql(dot)org>
- Subject: Re: [HACKERS] functions to obtain query plan
- Date: Sat, 21 Apr 2007 07:49:16 -0500
- Message-id: <F81EBB9B-67EF-48CD-B2F9-C99E208ACBA9(at)seespotcode(dot)net>
On Apr 21, 2007, at 4:46 , sharath kumar wrote:
For a particular query, are there any functions which can give me the start-up cost, total run-cost, number of rows and width?
-hackers is a list for discussion of development of PostgreSQL itself. Your question would probably be more appropriate in -general (which I am cc'ing) or perhaps -performance.
I believe EXPLAIN ANALYZE will provide what you're looking for. The PostgreSQL documentation is a good place to get started:
http://www.postgresql.org/docs/8.2/interactive/sql-explain.html http://www.postgresql.org/docs/8.2/interactive/performance-tips.html Hope this helps. Michael Glaesemann grzm seespotcode net
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