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clustering takes too long!

From: "Ravindra Guravannavar" <ravindrag(at)gmail(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Cc: ravindrag(at)gmail(dot)com
Subject: clustering takes too long!
Date: 2006-06-18 08:45:57
Message-ID: 5d141cb10606180145y2d1b8f18m8d855aa77fbbd05d@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
Hi,

I am trying to cluster an index on the TPC-H lineitem table having
6 million records. The index is on a single column l_suppkey.  Postgres
(8.1.3) is not able to finish the operation even after 2 hours! The disk
is being accessed continuously and CPU is at 2%. Postmaster is
started with the following options:

-B 2000 --work-mem=10240 --maintenance_work_mem=10240 --wal_buffers=32
--checkpoint_segments=128 --checkpoint_timeout=600

No useful messages in the logfile. With the default checkpoint_segments
(before I increased it to 128), there was a warning about checkpoints taking

place too frequently.

I tried this on two different machines and also with 8.1.4 and see the
same behavior.

On the same system, I am able to cluster an index on another much
larger table (10 million) records within few minutes.

Any clues on what could be going wrong?

Thanks,
Ravi

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