synapse/changelog.d/10359.bugfix at 36dc15412de9fc1bb2ba955c8b6f2da20d2ca20f - tileradotorg/synapse - tilera Git

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Erik Johnston 3acf85c85f

Reduce likelihood of Postgres table scanning state_groups_state. (#10359 )

The postgres statistics collector sometimes massively underestimates the
number of distinct state groups are in the `state_groups_state`, which
can cause postgres to use table scans for queries for multiple state
groups.

We fix this by manually setting `n_distinct` on the column.

2021-07-15 16:02:12 +01:00

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Fix PostgreSQL sometimes using table scans for queries against `state_groups_state` table, taking a long time and a large amount of IO.