On Tue, May 10, 2011 at 12:22 PM, Shaun Thomas <stho...@peak6.com> wrote:
> On 05/10/2011 10:06 AM, Maciek Sakrejda wrote: > > I have 8-core server, I wanted to ask whether a query can be divided for >>> multiple processors or cores, if it could be what to do in postgresql >>> >> >> No, at this time (and for the foreseeable future), a single query will >> run on a single core. >> > > It can *kinda* be done. Take a look at GridSQL. It's really good for > splitting up reporting-like queries that benefit from parallel access of > large tables. It's not exactly Hadoop, but I ran a test on a single system > with two separate instances of PostgreSQL, and a single query over those two > nodes cut execution time in half. > > It's meant for server parallelism, so I wouldn't necessarily recommend > splitting your data up across nodes on the same server. But it seems to > deliver as promised when used in the right circumstances. > > Yes, GridSQL is useful even in multi-core scenarios on a single server for query parallelism. You can also use the same PostgreSQL instance (cluster), as the virtual node databases are named distinctly, which simplifies configuration. Mason
