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Re: relation ### modified while in use

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: relation ### modified while in use
Date: 2000-11-02 17:20:39
Message-ID: 25813.973185639@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp> writes:
> Do we have a conclusion about this thread ?
> If no,how about changing heap_open(r) so that they allocate
> Relation descriptors after acquiring a lock on the table ?
> We would use LockRelation() no longer.

That won't do by itself, because that will open us up to failures when
a relcache invalidation arrives mid-transaction and we don't happen to
have the relation open at the time.  We could still have parse/plan
results that depend on the old relation definition.

Really we need to fix things so that a lock is held from first use to
end of transaction, independently of heap_open/heap_close.

			regards, tom lane

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