From: Richard Plotkin <richard@richardplotkin.com>
To: pgsql-performance@postgresql.org
Subject: Disk filling, CPU filling, renegade inserts and deletes?
Date: Wed, 20 Apr 2005 12:28:45 -0700
Message-ID: <6f4567d4e64297b356e2d71ec392cdae@richardplotkin.com> (raw)
Hi,
I'm having a pretty serious problem with postgresql's performance.
Currently, I have a cron task that is set to restart and vacuumdb -faz
every six hours. If that doesn't happen, the disk goes from 10% full
to 95% full within 2 days (and it's a 90GB disk...with the database
being a 2MB download after dump), and the CPU goes from running at
around a 2% load to a 99+% load right away (the stats look like a
square wave).
So it's problem-hunting time, I guess. The problem has something to do
with the following errors (there are a lot; I'm posting a short sample)
NOTICE: relation "pg_depend" TID 43/27: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_depend" TID 43/28: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_depend" TID 43/29: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_depend" TID 43/30: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_depend" TID 43/31: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_depend" TID 43/32: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_type" TID 17/44: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_type" TID 17/45: InsertTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/11:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/12:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/13:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/14:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/15:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/16:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_attribute" TID 133/17:
InsertTransactionInProgress 209545 --- can't shrink relation
NOTICE: relation "pg_class" TID 41/18: DeleteTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_class" TID 41/19: DeleteTransactionInProgress
209545 --- can't shrink relation
NOTICE: relation "pg_class" TID 41/20: DeleteTransactionInProgress
209545 --- can't shrink relation
When I vacuum full, I can't get rid of these errors unless I restart
the database (and then I restart, vacuum full, and everything's fine).
And once I do a successful vacuum full, CPU usage returns to normal,
and the disk is no longer almost full (back to 10% full). I'm at a loss
to figure out where the problem is coming from and how to fix it.
My machine: XServe G5 Dual 2GHz running Mac OS X Server 10.3.9.
Postgresql 8.0.1
Thanks for any responses/ideas/solutions (best of all!),
Richard
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To: pgsql-performance@postgresql.org
Cc: richard@richardplotkin.com
Subject: Re: Disk filling, CPU filling, renegade inserts and deletes?
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