Re: GD global data array capabilities in pltcl

On Mon, 14 Oct 2002, Constantin Teodorescu wrote:

> What would be the limitations of using the GD (global data) array in 
> pltcl stored procedures ?
> 
> I mean, if I'll keep there a big cache for a warehouse using
> 
> set GD($itemId,quantity) $computedQuantity
> ...
> then elsewhere
> 
> return $GS($itemId,quantity)
> 
> would be a problem for let's say , 15000 articles?
> 
> How would work the GD array in a heavy multi-user application?
> I presume that it is shared among any backend processes, isn't it?
> 
Comment in the code says:
    /************************************************************     * prefix procedure body with     * upvar #0
<internal_procname>GD
 

so I would say it's not accessable from other functions within the same
backend. I doubt very much that this data is database wide I can only see it
being backend specific.


> Are there some locking mechanisms?
> 
> In other words, is the GD array appropriate to implement some caching 
> features for a heavy used application in PostgreSQL?
> 
> If not, are there any other sollutions (before going to EJB's and stuff) ?
> 
> Thanks in advance,
> Constantin Teodorescu
> Braila, ROMANIA
> 

-- 
Nigel J. Andrews