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Add index to speed up Message.find_recent query #862

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merged 3 commits into from Nov 1, 2022
Merged

Add index to speed up Message.find_recent query #862

merged 3 commits into from Nov 1, 2022

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AndrewFerr
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This optimizes the heavy query made by Message.find_recent added by 026c39a in v0.12.1:

SELECT mxid, mx_room, tgid, tg_space, edit_index, redacted, content_hash, sender_mxid, sender FROM message
WHERE mx_room=$1 AND sender<>$2
ORDER BY tgid DESC LIMIT $3

Similar to #845, this was needed to unblock overloading our RDS on long queries. Here's a chart of the DB load 1) before upgrading to v0.12.1, 2) after upgrading, and 3) after adding the index (and killing hung leftover queries).
image

@AndrewFerr
Add index to speed up Message.find_recent query
473cc5a
@AndrewFerr
Don't error on pre-existing DB indexes
82c2af1 
Prevent some new DB upgrades from failing if an index they try to create
already exists. This allows for manually adding an index to a live DB
before its schema is "officially" upgraded.
@AndrewFerr
Update latest revision migration
aeb590b
@tulir tulir merged commit d798708 into mautrix:master Nov 1, 2022
@AndrewFerr AndrewFerr deleted the index-for-message-find-recent branch January 31, 2024 13:53
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@tulir tulir tulir approved these changes

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@AndrewFerr @tulir