Merge lp:~wgrant/launchpad/bug-899776-index into lp:launchpad

[William Grant]

Add an index on SourcePackagePublishingHistory to accelerate bug package component search.

The changes in https://code.launchpad.net/~wgrant/launchpad/bug-899776/+merge/103806 rely on a new index in order to be really fast. https://pastebin.canonical.com/65104/ is the query and plan from dogfood, with this index as temp_spph.

[Stuart Bishop (stub)]

review: Approve (db)

[Stuart Bishop (stub)]

Applied on staging and qastaging

[Stuart Bishop (stub)]

Applied on production slaves

[Stuart Bishop (stub)]

And production master. Now applied everywhere.

review: Approve (db)

=== added file 'database/schema/patch-2209-16-2.sql'
--- database/schema/patch-2209-16-2.sql	1970-01-01 00:00:00 +0000
+++ database/schema/patch-2209-16-2.sql	2012-04-27 07:39:46 +0000
@@ -0,0 +1,12 @@
+-- Copyright 2012 Canonical Ltd.  This software is licensed under the
+-- GNU Affero General Public License version 3 (see the file LICENSE).
+
+SET client_min_messages=ERROR;
+
+CREATE INDEX
+    sourcepackagepublishinghistory__archive__distroseries__component__spn__idx
+    ON sourcepackagepublishinghistory
+    USING btree (archive, distroseries, component, sourcepackagename)
+    WHERE status IN (1, 2);
+
+INSERT INTO LaunchpadDatabaseRevision VALUES (2209, 16, 2);