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authorErik Johnston <erik@matrix.org>2019-07-17 15:33:37 +0100
committerErik Johnston <erik@matrix.org>2019-07-18 14:15:57 +0100
commit6de09e07a6f7d043589205c25594852900a6626b (patch)
tree0511584c8c2e6bb4d1c27e0715a4bea95b4a4a9a /synapse/storage/schema/delta
parentMerge pull request #5597 from matrix-org/erikj/admin_api_cmd (diff)
downloadsynapse-6de09e07a6f7d043589205c25594852900a6626b.tar.xz
Add membership column to current_state_events table.
It turns out that doing a join is surprisingly expensive for the DB to
do when room_membership table is larger than the disk cache.
Diffstat (limited to 'synapse/storage/schema/delta')
-rw-r--r--synapse/storage/schema/delta/56/current_state_events_membership.sql19
1 files changed, 19 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/56/current_state_events_membership.sql b/synapse/storage/schema/delta/56/current_state_events_membership.sql
new file mode 100644
index 0000000000..5c754651cb
--- /dev/null
+++ b/synapse/storage/schema/delta/56/current_state_events_membership.sql
@@ -0,0 +1,19 @@
+/* Copyright 2019 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- We add membership to current state so that we don't need to join against
+-- room_memberships, which can be surprisingly costly (we do such queries
+-- very frequently).
+ALTER TABLE current_state_events ADD membership TEXT;