Re: PostgreSQL clustering VS MySQL clustering - Mailing list pgsql-performance

From Tatsuo Ishii
Subject Re: PostgreSQL clustering VS MySQL clustering
Date
Msg-id 20050124.115244.35008937.t-ishii@sra.co.jp
Whole thread Raw
In response to Re: PostgreSQL clustering VS MySQL clustering  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: PostgreSQL clustering VS MySQL clustering  (Hannu Krosing <hannu@tm.ee>)
List pgsql-performance
> Tatsuo Ishii <t-ishii@sra.co.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.

Of course. We need to keep a list of such that tuples until commit or
abort.
--
Tatsuo Ishii

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