Re: Why Postgres doesn't use TID scan?
Andrew Gierth <andrew@tao11.riddles.org.uk>
From: Andrew Gierth <andrew@tao11.riddles.org.uk>
To: Vladimir Ryabtsev <greatvovan@gmail.com>
Cc: tgl@sss.pgh.pa.us, pgsql-performance@lists.postgresql.org
Date: 2018-12-19T11:41:27Z
Lists: pgsql-performance
>>>>> "Vladimir" == Vladimir Ryabtsev <greatvovan@gmail.com> writes:
Vladimir> I can't believe it.
Vladimir> I see some recommendations in Internet to do like this
well, 90% of what you read on the Internet is wrong.
Vladimir> Did it really work in 2011? Are you saying they broke it?
Vladimir> It's a shame...
The method in that SO link does work, it's just slow. The workaround is
to do it like this instead:
delete from mytable
where ctid = any (array(select ctid from mytable
where ...
order by ...
limit 1000));
But of course that's still an ugly hack.
--
Andrew (irc:RhodiumToad)