2011/10/11 Michaël Michaud <michael.mich...@free.fr>
> Le 11/10/2011 18:50, G. Allegri a écrit :
>
> I don't know if it's possible with OJ, but with many other GIS softwares
> the user has the possibility to pause rendering (and reading data), adjust
> zoom levels, symbology, etc., the start rendering again.
>
> Have you examples ?
> In our case, i think it would not help. Stopping the renderer will not stop
> the query which will return all the queried rows, and throw the >:o OOM
> Exception.
>
QGis and ArcGIS, for example.
I suppose they stop iterating over the resultset.
You're right, it doesn't solve the OOM Exception, but it's a plus that I
would add to the "limit" addon request.
>
> I fear that a feature count limit is quite useless depending on the
> sequence in which data rows are mantained: they could be spatially
> sequential (in some way) but they could be spatially sparse. Let's suppose
> they start sequencially from top-left BBOX: in this case you would render
> only a region of the whole dataset, and you may miss the area you're
> interested in...
>
> The limit may mean : your zoom level is too small, I can't display all the
> features, but if you want to go on working, you can hide the layer or zoom
> in again.
> Useful to know that after an OOM exception, OpenJUMP may become instable
> and sometimes unsuable.
>
> My two cents
>
> Michaël
>
>
> my 2 cents,
> giovanni
>
> 2011/10/11 Rahkonen Jukka <jukka.rahko...@mmmtike.fi>
>
>> Hi,
>>
>> What do you think, would it be too dangerous to add a possibility to set a
>> feature count limit for PostGIS datastore layers? I know I can set scale
>> limit for the layer but if I have zoomed to show the whole country when
>> adding some layer with millions of features into OpenJUMP is starts to read
>> the whole PostGIS table and chokes before it is possible to set the scale
>> limit.
>>
>> What is dangerous is that user would not always have all the data from the
>> PostGIS layer on the visible map. Perhaps there should be a red light
>> burning and warning the user that there is a count limit set for the layer?
>> Even better if the light burns only if the feature limit has been reached.
>> Technically it should not be difficult to set the feature count, just to add
>> "limit [max_features]" to all the SQL queries if the parameter is set.
>>
>> -Jukka Rahkonen-
>>
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>
>
>
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> threats, fraudulent activity and more. Splunk takes this data and makes
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> definitive record of customers, application performance, security
> threats, fraudulent activity and more. Splunk takes this data and makes
> sense of it. Business sense. IT sense. Common sense.
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definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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