* Alvaro Herrera <[EMAIL PROTECTED]> wrote:
> On Thu, Mar 24, 2005 at 02:32:48PM +0100, Enrico Weigelt wrote:
> 
> > BTW: is it possible to explicitly clear the cache for immutable 
> > functions ?
> 
> What cache?  There is no caching of function results.

Not ? So what's immutable for ?

<snip>
> > I'd like to use immutable functions for really often lookups like 
> > fetching a username by uid and vice versa. The queried tables 
> > change very rarely, but when they change is quite unpredictable.
> 
> Maybe you should use a stable function if you fear we'll having function
> result caching without you noticing.

hmm, this makes more real evaluations necessary than w/ immuatable.
AFAIK stable functions have to be evaluated once per query, and the 
results are not cached between several queries.


cu
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