diff --git a/synapse/storage/engines/postgres.py b/synapse/storage/engines/postgres.py
index 1b97ee74e3..289b6bc281 100644
--- a/synapse/storage/engines/postgres.py
+++ b/synapse/storage/engines/postgres.py
@@ -45,6 +45,10 @@ class PostgresEngine(object):
# together. For example, version 8.1.5 will be returned as 80105
self._version = db_conn.server_version
+ # Are we on a supported PostgreSQL version?
+ if self._version < 90500:
+ raise RuntimeError("Synapse requires PostgreSQL 9.5+ or above.")
+
db_conn.set_isolation_level(
self.module.extensions.ISOLATION_LEVEL_REPEATABLE_READ
)
@@ -64,9 +68,9 @@ class PostgresEngine(object):
@property
def can_native_upsert(self):
"""
- Can we use native UPSERTs? This requires PostgreSQL 9.5+.
+ Can we use native UPSERTs?
"""
- return self._version >= 90500
+ return True
def is_deadlock(self, error):
if isinstance(error, self.module.DatabaseError):
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index ff49eaae02..10a27c207a 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -341,29 +341,7 @@ class SearchStore(BackgroundUpdateStore):
for entry in entries
)
- # inserts to a GIN index are normally batched up into a pending
- # list, and then all committed together once the list gets to a
- # certain size. The trouble with that is that postgres (pre-9.5)
- # uses work_mem to determine the length of the list, and work_mem
- # is typically very large.
- #
- # We therefore reduce work_mem while we do the insert.
- #
- # (postgres 9.5 uses the separate gin_pending_list_limit setting,
- # so doesn't suffer the same problem, but changing work_mem will
- # be harmless)
- #
- # Note that we don't need to worry about restoring it on
- # exception, because exceptions will cause the transaction to be
- # rolled back, including the effects of the SET command.
- #
- # Also: we use SET rather than SET LOCAL because there's lots of
- # other stuff going on in this transaction, which want to have the
- # normal work_mem setting.
-
- txn.execute("SET work_mem='256kB'")
txn.executemany(sql, args)
- txn.execute("RESET work_mem")
elif isinstance(self.database_engine, Sqlite3Engine):
sql = (
|
