| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Where does the time go? |
| Date: | 2006-03-25 15:00:51 |
| Message-ID: | 17991.1143298851@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> I would like to implement an additional mode for EXPLAIN ANALYZE that
> does no timing instrumentation at all. Most of the time just looking for
> differences between estimated and actual row counts is all you need.
I don't really agree with that premise ... without timings, you cannot
for instance tell if the planner has over/underestimated the cost of an
index fetch.
regards, tom lane
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