diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 07916b292d..045ae6c03f 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -177,39 +177,6 @@ class DataStore(RoomMemberStore, RoomStore,
self.__presence_on_startup = None
return active_on_startup
- def _get_cache_dict(self, db_conn, table, entity_column, stream_column, max_value):
- # Fetch a mapping of room_id -> max stream position for "recent" rooms.
- # It doesn't really matter how many we get, the StreamChangeCache will
- # do the right thing to ensure it respects the max size of cache.
- sql = (
- "SELECT %(entity)s, MAX(%(stream)s) FROM %(table)s"
- " WHERE %(stream)s > ? - 100000"
- " GROUP BY %(entity)s"
- ) % {
- "table": table,
- "entity": entity_column,
- "stream": stream_column,
- }
-
- sql = self.database_engine.convert_param_style(sql)
-
- txn = db_conn.cursor()
- txn.execute(sql, (int(max_value),))
- rows = txn.fetchall()
- txn.close()
-
- cache = {
- row[0]: int(row[1])
- for row in rows
- }
-
- if cache:
- min_val = min(cache.values())
- else:
- min_val = max_value
-
- return cache, min_val
-
def _get_active_presence(self, db_conn):
"""Fetch non-offline presence from the database so that we can register
the appropriate time outs.
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