From 5f7c9082805846cc07bfef2d48c6f6cfc9f723e9 Mon Sep 17 00:00:00 2001 From: reivilibre Date: Fri, 24 Mar 2023 15:31:12 +0000 Subject: As an optimisation, use `TRUNCATE` on Postgres when clearing the user directory tables. (#15316) --- synapse/storage/databases/main/user_directory.py | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'synapse/storage') diff --git a/synapse/storage/databases/main/user_directory.py b/synapse/storage/databases/main/user_directory.py index 97f09b73dd..9fced4b997 100644 --- a/synapse/storage/databases/main/user_directory.py +++ b/synapse/storage/databases/main/user_directory.py @@ -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( -- cgit 1.4.1