Re: gin index creation performance problems

On Mon, 3 Nov 2008 16:45:35 +0100
Ivan Sergio Borgonovo <mail(at)webthatworks(dot)it> wrote:

Forgot to add that top say postgresql is using 100% CPU and 15%
memory.

> I'm looking for a bit more guidance on gin index creation.
>
> The process:
> - vaccum analyze.
> - start a transaction that:
> - drop the triggers to update a tsvector
> - drop the index on the tsvector
> - fill several tables
> - update the tsvector in a table with ~800K records
> - recreate the gin index
> - commit
>
> To have a rough idea of the data involved:
> - 800K record
> - tsvector formed from concatenation of 6 fields
> - total length of concatenated fields ~ 200 chars *
> - average N of lexemes in tsvector 10 *
> [*] guessed
>
> 2xXeon HT 3.2GHz, 4Gb RAM, SCSI RAID5
>
> Index creation takes more than 1h.
>
> maintenance_work_mem is still untouched. What would be a good value
> to start from?
> Anything else to do to improve performances?

--
Ivan Sergio Borgonovo
http://www.webthatworks.it