Best practices for using layer definition queries for display/map rendering

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04-16-2012 11:59 AM
PieterCoetzer
New Contributor II
Re-post from http://forums.arcgis.com/threads/53327-Best-practices-for-using-layer-definition-queries-for-display... - Think I had it in the wrong forum.


Hi Guys,

I am busy setting up my layers for a typical vector map display, but I have a question around the use of definition queries instead of using split up layers.

I have a road network layer that contains a type field and obviously different types are displayed on different zoom scales. Now I have the option of using the definition query to load the roads of a specific type from the dataset, but the implication of doing this, is that on each different zoom scale, Arc requires all road types, which does take a while to render.

My question is would it be advisable to rather split out the layers into the different road types? The problem with this is that I won�??t be able to make use of the "join/merge" functionality with the Symbol Level?
or
Is there a way to load the full dataset once in memory, then use the same data on the different zoom scales (almost like a layer memory cache) thus limiting the cycles needed to query the raw vector data?

Thanks,

Pieter
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