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Re: PostgreSQL clustering VS MySQL clustering

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>
Cc: marty(at)outputservices(dot)com, herve(at)elma(dot)fr,pgsql-performance(at)postgresql(dot)org
Subject: Re: PostgreSQL clustering VS MySQL clustering
Date: 2005-01-22 21:10:23
Message-ID: 25335.1106428223@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
> Probably VACUUM works well for small to medium size tables, but not
> for huge ones. I'm considering about to implement "on the spot
> salvaging dead tuples".

That's impossible on its face, except for the special case where the
same transaction inserts and deletes a tuple.  In all other cases, the
transaction deleting a tuple cannot know whether it will commit.

			regards, tom lane

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