| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Guillaume Smet <guillaume(dot)smet(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: First steps with 8.3 and autovacuum launcher |
| Date: | 2007-10-02 15:17:47 |
| Message-ID: | 14690.1191338267@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera <alvherre(at)commandprompt(dot)com> writes:
> Tom Lane escribi:
>> It might be possible to solve this if we reduce the strength of the lock
>> used for ALTER TABLE. We'd have to go through all the commands
>> potentially issued by a pg_dump script and see if they could all be made
>> to run concurrently with autovac, which is a bit nervous-making but
>> might be feasible; and I'm afraid tablecmds.c would need some
>> restructuring to not use the same lock type for every variant of ALTER.
>> But it seems like a path worth investigating.
> Right. Are you going to work on it, or do you want me to propose a
> patch?
If you have time to work on it, please do. But it seems like you first
need to do some investigation --- the idea may not work at all.
In any case, this would still only fix things for pg_restore, and I
remain concerned that people will gripe about autovacuum blocking
locks. The idea of kicking autovac off tables remains probably more
interesting in the long run.
regards, tom lane
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