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upgrade-postgresql: Switch to vacuumdb --all --analzyze-only --jobs 10. 

The `analyze_new_cluster.sh` script output by `pg_upgrade` just runs
`vacuumdb --all --analyze-in-stages`, which runs three passes over the
database, getting better stats each time.  Each of these passes is
independent; the third pass does not require the first two.
`--analyze-in-stages` is only provided to get "something" into the
database, on the theory that it could then be started and used.  Since
we wait for all three passes to complete before starting the database,
the first two passes add no value.

Additionally, PosttgreSQL 14 and up stop writing the
`analyze_new_cluster.sh` script as part of `pg_upgrade`, suggesting
the equivalent `vacuumdb --all --analyze-in-stages` call instead.

Switch to explicitly call `vacuumdb --all --analyze-only`, since we do
not gain any benefit from `--analyze-in-stages`.  We also enable
parallelism, with `--jobs 10`, in order to analyze up to 10 tables in
parallel.  This may increase load, but will accelerate the upgrade
process.
This commit is contained in:
Alex Vandiver 2021-11-08 18:27:24 +00:00 committed by Tim Abbott
parent 2b025608d0
commit f77bbd3323
1 changed files with 1 additions and 1 deletions
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2
scripts/setup/upgrade-postgresql
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@ -48,7 +48,7 @@ SCRIPTS_PATH=$(grep -o "/var/log/postgresql/pg_upgradecluster-$UPGRADE_FROM-$UPG
crudini --set /etc/zulip/zulip.conf postgresql version "$UPGRADE_TO"
# Update the statistics
[ -n "$SCRIPTS_PATH" ] && su postgres -c "$SCRIPTS_PATH/analyze_new_cluster.sh"
su postgres -c "/usr/lib/postgresql/$UPGRADE_TO/bin/vacuumdb --all --analyze-only --jobs 10"
# Start the database up cleanly
"$ZULIP_PATH"/scripts/zulip-puppet-apply -f