Re: Need suggestion on how best to update 3 million rows

Lincoln Yeoh wrote:
> At 06:32 PM 9/6/2007, Richard Huxton wrote:
>
>> Two other tips for bulk-updates like this:
>> 1. Do as many columns in one go as you can
>> 2. Only update rows that need updating
>>
>> When you've finished, a CLUSTER/VACUUM FULL can be useful too.
>
> How about: make sure you have enough free space because the table will
> effectively double in size? Assuming it hasn't already been updated a few
> times without vacuuming :).

It is true for CLUSTER, but not for VACUUM FULL.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support