On Tue, 2001-12-18 at 13:46, Michael Owens wrote:
>
> By having the postmaster map multiple clients to a fixed number of backends,
> you achieve the happy medium: You never exceed the ideal number of active
> backends, and at the same time you are not limited to only accepting a fixed
> number of connections. Accepting connections can now be based on load
> (however you wish to define it), not number. You now make decisions based on
> utlization.
>
> If it were shown that even half of a backend's life consisted of idle time,
> leasing out that idle time to another active connection would potentially
> double the average number of simultaneous requests without (theoretically)
> incurring any significant degradation in performance.
>
Have you looked at the client-side connection pooling solutions out
there?
DBBalancer ( http://dbbalancer.sourceforge.net/ ) tries to sit very
transparently between your application and PostgreSQL, letting you
implement connection pooling with almost no application changes.
There was another one I came across too, but that one requires you to
make more wide-reaching changes to the application.
In my applications I have found DBBalancer to be roughly the same level
of performance as PHP persistent connections, but a lot fewer
connections are needed in the pool because they are only needed when
Apache is delivering dynamic content - not the associated static
stylesheets and images.
Regards, Andrew.
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