Re: Insert performance with composite index

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From: Marti Raudsepp <marti@juffo.org>
To: Divakar Singh <dpsmails@yahoo.com>
Cc: pgsql-performance@postgresql.org
Sent: Mon, November 1, 2010 6:23:17 PM
Subject: Re: [PERFORM] Insert performance with composite index

On Mon, Nov 1, 2010 at 14:49, Divakar Singh <dpsmails@yahoo.com> wrote:
> I am trying to tune my libpq program for insert performance.
> When I tried inserting 1M rows into a table with a Primary Key, it took
> almost 62 seconds.
> After adding a composite index of 2 columns, the performance degrades to 125
> seconds.

This sounds a lot like the bottleneck I was hitting. What Linux kernel
version are you running?

If it's 2.6.33 or later, see:
http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server#wal_sync_method_wal_buffers
http://archives.postgresql.org/pgsql-performance/2010-10/msg00602.php

Regards,
Marti