From: Melanie Plageman <melanieplageman@gmail.com>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Use DELETE instead of UPDATE to speed up vacuum test
Date: Mon, 29 Jul 2024 19:46:53 +0000
Message-ID: <E1sYWKb-001mzX-ER@gemulon.postgresql.org> (raw)
Use DELETE instead of UPDATE to speed up vacuum test
d42f60ccf07d89c introduced a test which generated dead tuples for vacuum
with an UPDATE. The test only required enough dead TIDs for two rounds
of index vacuuming. This can be accomplished with a DELETE instead of an
UPDATE -- which generates about 50% less WAL and makes the test 20%
faster in many cases. The test takes several seconds (more on slow
buildfarm animals) because we need quite a few tuples to trigger two
rounds of index vacuuming; so it is worth a follow-on commit to speed it
up.
Suggested-by: Masahiko Sawada
Discussion: https://postgr.es/m/CAAKRu_bWmMjmqL%2BOZ2duEQ80u7cRvpsExLNZNjzk-pXX5skwMQ%40mail.gmail.com
Backpatch-through: 14, the first version containing this test.
Branch
------
REL_14_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/924a08b76f5d9f89b2569caed26113f0a020c644
Modified Files
--------------
src/test/recovery/t/043_vacuum_horizon_floor.pl | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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To: pgsql-committers@postgresql.org
Cc: melanieplageman@gmail.com, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Use DELETE instead of UPDATE to speed up vacuum test
In-Reply-To: <E1sYWKb-001mzX-ER@gemulon.postgresql.org>
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