On Thu, Jan 26, 2012 at 10:54 PM, Stephen V. Mather <
[email protected]> wrote:
> Hi All,****
>
> Are there any recommended tips and tricks to getting fast
> responses with GetFeatureInfo? I’ve got a lot of layers I’m serving up
> through OpenLayers. If I turn many of them off, I get an almost instant
> response, but the more I turn on, the slower the response gets, sometimes
> taking 30 seconds to return a value.
>
Wow, that's a long time. How many layers are we taking about?
GetFeatureInfo has a QUERY_LAYER parameter where you specify which layers
you want to query out
of the original map. Maybe you can shorten the list of layers being queried
a bit?
Besides that, there are possible code modifications to make that query
faster:
- today we retrieve also the geometry because templates _can_ return it to
the client (and the GML output surely does).
One thing could be to identify a list of attributes that should be
returned by GetFeatureInfo, so that one can
limit it appropriately
- another option having multiple layers could be to parallelize queries a
bit
Cheers
Andrea
--
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Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
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