| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Jan Wieck <JanWieck(at)Yahoo(dot)com> |
| Cc: | PostgreSQL HACKERS <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: update on TOAST status' |
| Date: | 2000-07-06 20:29:29 |
| Message-ID: | 200007062029.QAA11590@candle.pha.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
> - VACUUM doesn't propagate ANALYZE to TOAST tables.
> Statistics for them are needless because the toast access
> is allways hardcoded indexed.
I don't think statistics are insignificant for TOASTed columns. If I
say col=3, the optimizer uses that information for estimating the number
of rows returned, and figuring out the type of join and order of join to
perform, not just for "use index, don't use index" decisions.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2000-07-06 20:35:34 | Re: 2nd update on TOAST |
| Previous Message | Jan Wieck | 2000-07-06 18:36:26 | Re: Fix for pg_dump |