Re: "slow" queries

On Mon, Mar 02, 2009 at 02:29:31PM -0500, Tom Lane wrote:
> Brian Cox <brian(dot)cox(at)ca(dot)com> writes:
> > select locktype,database,relation,virtualxid,virtualtransaction,pid,mode
> > from pg_locks order by mode;
>
> If you hadn't left out the "granted" column we could be more sure,
> but what it looks like to me is the DROP (pid 13842) is stuck behind
> the <IDLE> transaction (pid 13833). In particular these two rows of
> pg_locks look like a possible conflict:
>
> > relation | 26472437 | 26472508 | | 15/69749
> > | 13842 | AccessExclusiveLock
>
> > relation | 26472437 | 26472508 | | 11/131
> > | 13833 | AccessShareLock

Would it be possible to write a stored procedure that would read
pg_locks, and other relevant tables, and list what's blocking what
in a simplified form?

Tim.