Re: [HACKERS] []performance issues

On Fri, Aug 02, 2002 at 02:08:02PM -0400, Rod Taylor wrote:
>
> Of course, as suggested this is easily overcome by keeping your own c
> counter.
>
> begin;
> insert into bigtable values ();
> update into counttable set count=count+1;
> commit;
>
> Now you get all the fun concurrency issues -- but fetching the
> information will be quick.   What happens more, the counts, or the
> inserts :)

You could get around this with a trigger that just inserts 1 into one
table (call it counter_unposted), and then using an external process
to take those units, add them to the value in counter_posted, and
delete them from counter_unposted.  You'd always be a few minutes
behind, but you'd get a counter that's pretty close without too much
overhead.  Of course, this raises the obvious question: why use
count() at all?

A

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