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Fix thread BG update to not seq scan event_json (#11192)

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For some reason the query optimiser decided to seq scan both tables,
rather than index scanning `event_json`.
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Erik Johnston 2021-10-27 12:33:21 +01:00 committed by GitHub
parent 2dbef6c10a
commit 72626b78ef
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2 changed files with 2 additions and 1 deletions
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changelog.d/11192.feature Normal file
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@ -0,0 +1 @@
Experimental support for the thread relation defined in [MSC3440](https://github.com/matrix-org/matrix-doc/pull/3440).

2
synapse/storage/databases/main/events_bg_updates.py
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@ -1108,7 +1108,7 @@ class EventsBackgroundUpdatesStore(SQLBaseStore):
""" """
SELECT event_id, json FROM event_json SELECT event_id, json FROM event_json
LEFT JOIN event_relations USING (event_id) LEFT JOIN event_relations USING (event_id)
WHERE event_id > ? AND relates_to_id IS NULL WHERE event_id > ? AND event_relations.event_id IS NULL
ORDER BY event_id LIMIT ? ORDER BY event_id LIMIT ?
""", """,
(last_event_id, batch_size), (last_event_id, batch_size),