Search Postgresql Archives

Re: Counting records in a PL/pgsql cursor

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, 3 Nov 2006, Merlin Moncure wrote:
> >
> > I can deal with materializing the resultset, but I want to get away from
> > the loop-a-thousand-times-doing-plus-one...
>
> i dont think its possible.  note that you can make a refcursor inside
> your plpgsql function and pass it to an sql function which can do sql
> cursor operations on it -- i think :-)..haven't tried it yet.
>
> merlin

...If you know your application well enough, you might get away with doing
a select count() with the same where clause just before entering the
cursor. It _could_ of course be wrong, though! OTOH, it would be much
faster. If the only down-side is occasionally giving users an incorrect
count, then perhaps call it a "row estimate", and let them marvel at how
accurate the estimate is most of hte time!

Good luck,
Richard



-- 
Richard Troy, Chief Scientist
Science Tools Corporation
510-924-1363 or 202-747-1263
rtroy@xxxxxxxxxxxxxxxx, http://ScienceTools.com/



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux