| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | josh(at)agliodbs(dot)com, pgsql-hackers(at)postgresql(dot)org, Neil Conway <neilc(at)samurai(dot)com> |
| Subject: | Re: raising the default default_statistics_target |
| Date: | 2004-03-08 19:22:36 |
| Message-ID: | 200403081922.i28JMaR18689@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Do all the columns have to have the same number of statistics buckets?
>
> They do not, but the effort spent by ANALYZE is proportional to the
> largest stats target among all the columns of the table.
Could we use previous stats to determine how many buckets to use when
running ANALYZE. Also, if columns have a different number of buckets,
does that mean that we don't have the same per-query overhead for a
larger stats target?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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