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-001mzR-Cw@gemulon.postgresql.org> (raw)
Use DELETE instead of UPDATE to speed up vacuum test
01e2b7f0fd02a44e 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_16_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/571e0ee40ebdaf0c75b11756620c9c9d453cc644
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-001mzR-Cw@gemulon.postgresql.org>
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