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: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] Cache on pg_statistics |
Date: | 1999-11-25 00:21:07 |
Message-ID: | 199911250021.TAA29865@candle.pha.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Tom, let me know what caches you want on pg_statistics, or if you would
> > prefer to do it yourself, instructions are at the top of syscache.c.
>
> AFAIK the only index we need is one on starelid + staattnum. If you
> have the time, please put it in and teach getattstatistics() in
> backend/utils/adt/selfuncs.c to use it. That seems to be the only
> place that reads pg_statistic.
>
> If you wanted to include staop as a third column, then the index could
> be UNIQUE. (We don't actually use staop at the moment, but I think it
> should be left in place for possible future use.)
>
> vacuum.c may also need to be taught to fill the index...
Done. Let me know how it works. I had to add selop param to the
function getattstatistics() because I needed it to find the cache entry
because that field is in the cache.
Not sure how to test if it is working.
--
Bruce Momjian | http://www.op.net/~candle
maillist(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 | Jan Wieck | 1999-11-25 01:47:09 | Re: [HACKERS] run_check problem |
Previous Message | Jan Wieck | 1999-11-25 00:09:53 | lztext and parser |