Re: Distributed/Parallel Computing

On Mon, Oct 5, 2009 at 12:11 PM, Viji V Nair <viji(at)fedoraproject(dot)org> wrote:
> Hi Team,
>
> This question may have asked many times previously also, but I could not
> find a solution for this in any post. any help on the following will be
> greatly appreciated.
>
> We have a PG DB with PostGIS functions. There are around 100 tables in the
> DB and almost all the tables contains 1 million records, around 5 table
> contains more than 20 million records. The total DB size is 40GB running on
> a 16GB, 2 x XEON 5420, RAID6, RHEL5 64bit machines, the questions is
>
> 1. The geometry calculations which we does are very complex and it is taking
> a very long time to complete. We have optimised PG config to the best, now
> we need a mechanism to distribute these queries to multiple boxes. What is
> best recommended way for this distributed/parallel deployment. We have tried
> PGPOOL II, but the performance is not satisfactory. Going for a try with
> GridSQL

What is the nature of the transactions being run? Are they primarily
read-only other than bulk updates to the GIS data, are they OLTP in
regards to the GIS data, or are they transactional with regards to
other tables but read-only with respect to the GIS?

Jeff