From b568ca309c5724d28b6ebd9c0a3cd8179fa6d6d3 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 8 Sep 2016 09:38:54 +0100
Subject: [PATCH] Temporarily disable sequential scans for state fetching

---
 synapse/storage/state.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index d6643473db..fef87834ca 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -310,6 +310,10 @@ class StateStore(SQLBaseStore):
 
         results = {group: {} for group in groups}
         if isinstance(self.database_engine, PostgresEngine):
+            # Temporarily disable sequential scans in this transaction. This is
+            # a temporary hack until we can add the right indices in
+            txn.execute("SET LOCAL enable_seqscan=off")
+
             # The below query walks the state_group tree so that the "state"
             # table includes all state_groups in the tree. It then joins
             # against `state_groups_state` to fetch the latest state.