On Thu, Apr 14, 2011 at 6:54 PM, Tim Schaub <[email protected]> wrote:
> > Sorry, I meant to ask about *paging* on all stores.
>
> And I should add, I know it is less efficient for the server to do
> paging for stores that don't support it. But in my mind, paging is
> about easing the burden on the client.
>
> A response set with a ton of records may be a lot for the server to
> handle, but resources are typically more limited on the client. Paging
> manually would only add minor work on the server (as I imagine it), but
> it is a huge relief in terms of the burden on the client.
>
>
Nevertheless we have to be very careful. We have received funding to avoid
_counting_ records in WFS responses, because that takes a ton of time
if you have a 50 millions records in a Oracle database.
Yet that is a quite light operation compared to paging and sorting.
You should consider three orders of magnitude:
- the size that a javascript client can handle in a reasonable time
- the size that a server can handle in a reasonable time
- the size that a large public administrator is mandated to handle, one
that would bring to his knees even a server if not properly handled
So I'm ok with allow administrators to give full sorting/paging support to
whatever store, but we have to be careful that this will be either
always a light operation, otherwise we have to provide the admin the option
to turn it off to safeguard the server stability
Cheers
Andrea
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