Re: Large data sets and FOR LOOP's

Bo Lorentsen wrote:
> Hi ...
>
> I have been working on some server side scripts in Plpgsql and I'm quite
> happy about them (nice and fast way to work with large data sets) :-)
>
> But, if I, in my code, make "for loop" on a huge select result (about
> 1.7 mil. rows), my function begin to consume alot of memory. The code
> looks like this :
>
> FOR trec IN SELECT f1,f2 FROM large_tabel LOOP
> ...
> END LOOP;

You probably want to upgrade to 7.2, because 7.2's PL/pgSQL
uses the newly available SPI cursors silently in FOR loops.

Releases before 7.2 loaded the entire result set into memory
(ahem, swap space) before entering the FOR loop.

Jan

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