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As an optimisation, use TRUNCATE on Postgres when clearing the user directory tables. (#15316)

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reivilibre 2023-03-24 15:31:12 +00:00 committed by GitHub
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1
changelog.d/15316.misc Normal file
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@ -0,0 +1 @@
As an optimisation, use `TRUNCATE` on Postgres when clearing the user directory tables.

15
synapse/storage/databases/main/user_directory.py
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@ -698,10 +698,17 @@ class UserDirectoryBackgroundUpdateStore(StateDeltasStore):
"""Delete the entire user directory"""
def _delete_all_from_user_dir_txn(txn: LoggingTransaction) -> None:
txn.execute("DELETE FROM user_directory")
txn.execute("DELETE FROM user_directory_search")
txn.execute("DELETE FROM users_in_public_rooms")
txn.execute("DELETE FROM users_who_share_private_rooms")
# SQLite doesn't support TRUNCATE.
# On Postgres, DELETE FROM does a table scan but TRUNCATE is more efficient.
truncate = (
"DELETE FROM"
if isinstance(self.database_engine, Sqlite3Engine)
else "TRUNCATE"
)
txn.execute(f"{truncate} user_directory")
txn.execute(f"{truncate} user_directory_search")
txn.execute(f"{truncate} users_in_public_rooms")
txn.execute(f"{truncate} users_who_share_private_rooms")
txn.call_after(self.get_user_in_directory.invalidate_all)
await self.db_pool.runInteraction(