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Re: Fully replacing ps_status (was Re: [COMMITTERS] pgsql: Add GUC update_process_title to control whether 'ps' display is)

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Bruce Momjian <bruce(at)momjian(dot)us>, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Fully replacing ps_status (was Re: [COMMITTERS] pgsql: Add GUC update_process_title to control whether 'ps' display is)
Date: 2006-06-28 01:43:30
Message-ID: 20060628014330.GL7539@kenobi.snowman.net (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
* Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
> momjian(at)postgresql(dot)org (Bruce Momjian) writes:
> > Add GUC update_process_title to control whether 'ps' display is updated
> > for every command, default to on.
> 
> It strikes me that the ps_status support provides one important bit of
> information that is currently hard to get elsewhere; specifically, the
> "waiting" flag that gets added while blocked on a lock.  You can find
> out if a process is blocked by looking in pg_locks, but that's a fairly
> expensive probe in itself and then you have to join to pg_stat_activity
> to make any sense of it.  I wonder if we should add a "waiting" boolean
> column to pg_stat_activity?  Given the new implementation of
> pg_stat_activity, updating such a flag would be pretty cheap.

That would be an *excellent* addition..  Honestly, I think it'd be nice
to get a 'NOTICE' in such cases too, but having it in pg_stat_activity
will help alot.

	Thanks,

		Stephen

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