Hi, I was running an update using ./launcher rebuild app But it stuck at 156:M 23 Jan 10:19:31.078 * 10 changes in 300 seconds. Saving... 156:M 23 Jan 10:19:31.081 * Background saving started by pid 3150 3150:C 23 Jan 10:19:31.655 * DB saved on disk 3150:C 23 Jan 10:19:31.657 * RDB: 26 MB of memory…

The update has complete after 3 hours.

Discourse occasionally runs a VACUUM on the database during migrations to make sure space is being reclaimed (see the db:migrate job in db.rake ). You can disable this behaviour by setting the vacuum_db_days site setting to 0 .

Hmm actually VACUUM ANALYZE can be run against a live DB. I think we should move it into a background process when the app is running rather than run it during a rebuild?

Maybe have weekly schedule trigger it if it is overdue?

That’s what autovacuum is supposed to be doing. Perhaps we just need to tweak the thresholds for that a bit?

Ahh good point. In that case, I don’t see a point in us running VACUUM ANALYZE from the app and have a PR to remove it. https://github.com/discourse/discourse/pull/4687 If we need to tweak autovacuum, we should configure it from the template in discourse_docker .

PR has been merged :slight_smile:

Update took quite long due to Vacuum

Product Support Self-hosting

tgxworld (Alan Tan) 20 Febbraio 2017, 1:09am 8

PR has been merged

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Update took quite long due to Vacuum

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