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pgsql: Fix logic in lazy vacuum to decide if it's worth trying to

From: heikki(at)postgresql(dot)org (Heikki Linnakangas)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Fix logic in lazy vacuum to decide if it's worth trying to
Date: 2009-01-06 14:55:37
Message-ID: 20090106145537.A922D754A1B@cvs.postgresql.org (view raw or flat)
Thread:
Lists: pgsql-committers
Log Message:
-----------
Fix logic in lazy vacuum to decide if it's worth trying to truncate the heap.
If the table was smaller than REL_TRUNCATE_FRACTION (= 16) pages, we always
tried to acquire AccessExclusiveLock on it even if there was no empty pages
at the end.

Report by Simon Riggs. Back-patch all the way to 7.4.

Modified Files:
--------------
    pgsql/src/backend/commands:
        vacuumlazy.c (r1.115 -> r1.116)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuumlazy.c?r1=1.115&r2=1.116)

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Next:From: Heikki LinnakangasDate: 2009-01-06 14:55:44
Subject: pgsql: Fix logic in lazy vacuum to decide if it's worth trying to
Previous:From: Alvaro HerreraDate: 2009-01-06 14:47:37
Subject: pgsql: Fix string reloption handling, per KaiGai Kohei.

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