From 9d0687b0559095f270a55af3467c53ad29bfd4c7 Mon Sep 17 00:00:00 2001
From: Brion Vibber <brion@pobox.com>
Date: Tue, 10 Nov 2009 08:23:24 -0800
Subject: Adjusting indexes to make favorites query more efficient, based on
 feedback from ops.

fave_user_id_idx index changed from (user_id) to (user_id,modified), so the timestamp ordering can be done straight from the index while we're looking up the user's notices.
Added to 08to09.sql and 08to09_pg.sql; may need to be run manually by folks doing development.
(No harm if you don't update it, the favorites tab/rss feed will just stay inefficent.)
---
 db/08to09_pg.sql | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'db/08to09_pg.sql')

diff --git a/db/08to09_pg.sql b/db/08to09_pg.sql
index 197fcabfd..956c4dee5 100644
--- a/db/08to09_pg.sql
+++ b/db/08to09_pg.sql
@@ -48,3 +48,6 @@ create table login_token (
     constraint primary key (user_id)
 );
 
+alter table fave
+    drop index fave_user_id_idx,
+    add index fave_user_id_idx using btree(user_id,modified);
-- 
cgit v1.2.3-54-g00ecf

