[HACKERS] functions to obtain query plan

[sharath kumar]

Hello
For a particular query, are there any functions which can give me the
start-up cost, total run-cost, number of rows and width?

Thanks,
Sharat.

Re: [HACKERS] functions to obtain query plan

[Michael Glaesemann]

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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TIP 6: explain analyze is your friend