hydra/src/sql/upgrade-3.sql

create index IndexBuildsOnKeep on Builds(keep); -- used by hydra-update-gc-roots
create index IndexMostRecentSuccessfulBuilds on Builds(project, jobset, job, system, finished, buildStatus, id desc); -- used by hydra-update-gc-roots
Speed up hydra-update-gc-roots The hydra-update-gc-roots script is taking around 95 minutes on our Hydra instance (though a lot of that is I/O wait). This patch significantly reduces the number of database queries. In particular, the N most recent successful builds for each job in a jobset are now determined in a single query. Also, it removes the calls to readlink(). 2012-03-07 14:02:31 +00:00			`create index IndexBuildsOnKeep on Builds(keep); -- used by hydra-update-gc-roots`
			`create index IndexMostRecentSuccessfulBuilds on Builds(project, jobset, job, system, finished, buildStatus, id desc); -- used by hydra-update-gc-roots`