Re: lock help

On Thu, Mar 20, 2008 at 10:42:29AM -0400, Tom Lane wrote:
> Ray Stell <stellr(at)cns(dot)vt(dot)edu> writes:
> Define "wedged" --- what's the actual problem?

client queries not returning.

> If it is a locking issue then the pg_locks view might be useful.

duh, I meant to cut and paste the lock info and sent user info
by being in a panic.

ghiza=# select * from pg_locks;
locktype | database | relation | page | tuple | transactionid | classid | objid | objsubid | transaction | pid | mode | granted
---------------+----------+----------+------+-------+---------------+---------+-------+----------+-------------+-------+-----------------+---------
relation | 16384 | 10328 | | | | | | | 15470960 | 30765 | AccessShareLock | t
transactionid | | | | | 15470960 | | | | 15470960 | 30765 | ExclusiveLock | t
(2 rows)

As it turns out this app is distributed across 3 or 4 dbs and it was an oracle
instance that was hung. However, I was ill prepared to eval the state of
the pg db. Is there a good place to focus in the docs on how to evaluate
locking issues.

Thanks.