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authorSean Quah <8349537+squahtx@users.noreply.github.com>2022-11-10 19:02:27 +0000
committerGitHub <noreply@github.com>2022-11-10 19:02:27 +0000
commitb2c2b030798d0e74d3bf1afb4726465b53620638 (patch)
treea93ecc29c3af6b3b701dfa36206a4e34b384c04c /changelog.d
parentQuieter logging for stateres failure at missing prev events (#14346) (diff)
downloadsynapse-b2c2b030798d0e74d3bf1afb4726465b53620638.tar.xz
Fix PostgreSQL sometimes using table scans for `event_search` (#14409)
PostgreSQL may underestimate the number of distinct `room_id`s in
`event_search`, which can cause it to use table scans for queries for
multiple rooms.

Fix this by setting `n_distinct` on the column.

Resolves #14402.

Signed-off-by: Sean Quah <seanq@matrix.org>
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+Fix PostgreSQL sometimes using table scans for queries against the `event_search` table, taking a long time and a large amount of IO.