at the first query, and commits it before the output is sent. Locks will
be held from the time when the query is done until the commit. So you
can reduce lock time by doing as much processing as possible before you
-do your write queries. Update operations which do not require database
-access can be delayed until after the commit by adding an object to
-$wgPostCommitUpdateList.
+do your write queries.
Often this approach is not good enough, and it becomes necessary to
enclose small groups of queries in their own transaction. Use the