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Re: Lingering Checkpoint Process

From: "Cory Vokey" <cvokey(at)rim(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Lingering Checkpoint Process
Date: 2005-02-23 18:43:18
Message-ID: D93992E093AA034F8D6BED008B91614B01A077AB@XCH30YKF.rim.net (view raw or flat)
Thread:
Lists: pgsql-admin
Thanks for the response Tom.

The checkpoint process seems to be just sitting.  I'll post the details
of strace/gdb in the morning.

Thanks again!

--Cory
 
BIS Database Engineering

-----Original Message-----
From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us] 
Sent: Wednesday, February 23, 2005 1:13 PM
To: Cory Vokey
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Lingering Checkpoint Process 

"Cory Vokey" <cvokey(at)rim(dot)com> writes:
> Hi all, I'm seeing a checkpoint process lingering around for ~ 24hrs
on
> one of my test systems and WAL logs are accumulating.  It's running
> postgres 7.4.6.

Is the checkpoint process actually doing anything, or just sitting?
(strace'ing it would reveal this)  If it seems to be just sitting,
could you attach to it with gdb and get a stack trace to find out
where it's sitting?

The only known cause of checkpoints not proceeding in 7.4.* is that
long btree CREATE INDEX operations can block them.  But 24 hours
sounds pretty long for a CREATE INDEX too ...

			regards, tom lane



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