diff options
| -rw-r--r-- | synapse/storage/databases/main/event_push_actions.py | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/synapse/storage/databases/main/event_push_actions.py b/synapse/storage/databases/main/event_push_actions.py index eeccf5db24..6fdb1e292e 100644 --- a/synapse/storage/databases/main/event_push_actions.py +++ b/synapse/storage/databases/main/event_push_actions.py @@ -1836,6 +1836,15 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas # deletes. batch_size = self._rotate_count + if isinstance(self.database_engine, PostgresEngine): + # Temporarily disable sequential scans in this transaction. We + # need to do this as the postgres statistics don't take into + # account the `highlight = 0` part when estimating the + # distribution of `stream_ordering`. I.e. since we keep old + # highlight rows the query planner thinks there are way more old + # rows to delete than there actually are. + txn.execute("SET LOCAL enable_seqscan=off") + txn.execute( """ SELECT stream_ordering FROM event_push_actions |