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-rw-r--r--synapse/storage/search.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index 479b04c636..7b1166f417 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -106,6 +106,7 @@ class SearchStore(BackgroundUpdateStore):
                 event_search_rows.append((event_id, room_id, key, value))
 
             if isinstance(self.database_engine, PostgresEngine):
+                txn.execute("SET work_mem='256KB'")
                 sql = (
                     "INSERT INTO event_search (event_id, room_id, key, vector)"
                     " VALUES (?,?,?,to_tsvector('english', ?))"
@@ -123,6 +124,9 @@ class SearchStore(BackgroundUpdateStore):
                 clump = event_search_rows[index:index + INSERT_CLUMP_SIZE]
                 txn.executemany(sql, clump)
 
+            if isinstance(self.database_engine, PostgresEngine):
+                txn.execute("RESET work_mem")
+
             progress = {
                 "target_min_stream_id_inclusive": target_min_stream_id,
                 "max_stream_id_exclusive": min_stream_id,