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Re: Auto Vacuum

From: "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: Russell Smith <mr-russ(at)pws(dot)com(dot)au>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Auto Vacuum
Date: 2004-11-30 03:14:10
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Lists: pgsql-hackers
Bruce Momjian wrote:

>Matthew T. O'Connor wrote:
>>Bruce Momjian wrote:
>>>I have added an auto-vacuum TODO item:
>>>* Auto-vacuum
>>>       o Move into the backend code
>>>       o Scan the buffer cache to find free space or use background writer
>>>       o Use free-space map information to guide refilling
>>I'm not sure what you mean exactly by "Scan the buffer cache to find 
>>free space or use background writer", the other two are definitely high 
>>priority todo items (at least as far as autovacuum in concerned).
>I am thinking we could look for expired tuples when while they are in
>the buffer cache or before they are written to disk so we don't have to
>a sequential scan to find them.
Is that related to autovacuum? Or is that a potential feature inside the 
actual vacuum command?

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