From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: Could ANALYZE estimate bloat? |
Date: | 2013-09-20 19:21:33 |
Message-ID: | 523CA03D.9000200@commandprompt.com |
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Thread: | |
Lists: | pgsql-hackers |
On 09/20/2013 11:59 AM, Josh Berkus wrote:
>
> Hackers,
>
> I've been tinkering with a number of table bloat checks, and it occurred
> to me that the problm is that these are all approximations based on
> overall gross statistics, and as such highly inaccurate.
>
> It seems like would could have ANALYZE, while sampling from the table,
> also check the amount of dead space per page and use that as an estimate
> of the % of dead space overall. We'd still need something else for
> indexes, but this seems like it would be a good start.
>
> No?
I think this is a great idea.
>
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