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Re: Index creation

From: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
To: Eric Jain <Eric(dot)Jain(at)isb-sib(dot)ch>
Cc: pgsql-performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Index creation
Date: 2004-01-07 19:51:30
Message-ID: Pine.LNX.4.33.0401071248290.5671-100000@css120.ihs.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, 7 Jan 2004, Eric Jain wrote:

> Any tips for speeding up index creation?
> 
> I need to bulk load a large table with 100M rows and several indexes,
> some of which span two columns.
> 
> By dropping all indexes prior to issuing the 'copy from' command, the
> operation completes 10x as fast (1.5h vs 15h).
> 
> Unfortunately, recreating a single index takes nearly as long as loading
> all of the data into the table; this more or less eliminates the time
> gained by dropping the index in the first place.
> 
> Also, there doesn't seem to be a simple way to disable/recreate all
> indexes for a specific table short of explicitely dropping and later
> recreating each index?

Note that you can issue the following command to see all the index 
definitions for a table:

select * from pg_indexes where tablename='sometable';

And store those elsewhere to be reused when you need to recreate the 
index.


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