You cant. There is an article about count performance. Generally its slow but latest version 9.2 i think supports index for count under some condition.But 300 isnt that much that you should worry.Another modern solution is to not count results just add one more at limit to see if there is next page.
On Fri, Oct 5, 2012 at 5:29 PM, Moshe Jacobson
<moshe@neadwerx.com> wrote:
We have a PHP web application that pulls results from the database and paginates them.We show e.g. "1-50 of 300" so the user knows how many total results there are, and which ones are currently being displayed.
To achieve this, we use a query with LIMIT...OFFSET to get the displayed results, and we do another identical query using count(*) to get the total count.
Is there a more efficient way to do this that does not require us to do two queries? I just feel that it's a waste of resources the way we do it.
Thanks!
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Moshe Jacobson
Nead Werx, Inc. | Senior Systems Engineer