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mirrors/synapse

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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

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