From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Ed Loehr <eloehr(at)austin(dot)rr(dot)com> |
Cc: | pghackers <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: vacuum analyze feedback |
Date: | 2000-05-25 16:11:02 |
Message-ID: | 200005251611.MAA25351@candle.pha.pa.us |
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Lists: | pgsql-hackers |
> I know this topic has been rehashed a million times, but I just wanted to
> add one datapoint. I have a database (150 tables, less than 20K tuples
> in any one table) which I 'vacuum analyze'*HOURLY*, blocking all access,
> and I still see frequent situations where my query times bloat by roughly
> 300% (4 times slower) in the intervening time between vacuums. All this
> is to say that I think a more strategic implementation of the
> functionality of vacuum analyze (specifically, non-batched, automated,
> on-the-fly vacuuming/analyzing) would be a major "value add". I haven't
> educated myself as to the history of it, but I do wonder why the
> performance focus is not on this. I'd imagine it would be a performance
> hit (which argues for making it optional), but I'd gladly take a 10%
> performance hit over the current highly undesireable degradation. You
> could do a whole lotta optimization on the planner/parser/executor and
> not get close to the end-user-perceptible gains from fixing this
> problem...
>
Vadim is planning over-write storage manager in 7.2 which will allow
expired tuples to be reunsed without vacuum.
Or is the ANALYZE the issue for you? You need hourly statistics?
--
Bruce Momjian | http://www.op.net/~candle
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
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