On Sat, Nov 29, 2014 at 11:46 PM, Jim Nasby <Jim.Nasby@bluetreble.com> wrote:
> What do you mean by "never succeed"? Is it skipping a large number of pages?
> Might re-trying the locks within the same vacuum help, or are the user locks
> too persistent?
You are confused. He's talking about the relation-level lock that
vacuum attempts to take before doing any work at all on a given table,
not the per-page cleanup locks that it takes while processing each
page. If the relation-level lock can't be acquired, the whole table
is skipped.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company