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POSpatial index is slow when trying to find all the points within a range of a geocode. How do I make this faster?
 

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  1. POSpatial index is slow when trying to find all the points within a range of a geocode. How do I make this faster?
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    <p>I've setup a spatial index on a table that has 1.3 million records in it that are all geocoded. These values are stored in a geography data type column. The problem I'm having is that when I query this column that has a spatial index is is really slow still. It's taking about 20 seconds to find all of the accounts within a mile for instance.</p> <p>Here is an example of a query that runs slow:</p> <pre><code>DECLARE @g Geography; SET @g = (select ci.Geocode from CustomerInformation ci where ci.CIOI = 372658) DECLARE @region geography = @g.STBuffer(1609.344) Select top 100 ci.Geocode.STDistance(@g), ci.CIOI from CustomerInformation ci where ci.Geocode.Filter(@region) = 1 order by ci.Geocode.STDistance(@g) asc </code></pre> <p>Here is my create index statement:</p> <pre><code>CREATE SPATIAL INDEX [IX_CI_Geocode] ON [dbo].[CustomerInformation] ( [Geocode] )USING GEOGRAPHY_GRID WITH ( GRIDS =(LEVEL_1 = MEDIUM,LEVEL_2 = LOW,LEVEL_3 = LOW,LEVEL_4 = LOW), CELLS_PER_OBJECT = 128, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) GO </code></pre> <p>The data is every house in a portion of a single state. So in a mile radius I expect there to be a 1000 points or more. Am I indexing this properly? Any help would be great.</p> <p>Another slow query example:</p> <pre><code>DECLARE @g Geography; SET @g = (select ci.Geocode from CustomerInformation ci where ci.CIOI = 372658) select top(100) CIOI, (ciFinding.Geocode.STDistance(@g) / 1609.344) as Distance, ciFinding.Geocode.ToString() --ciFinding.Geocode.STDistance(@g) / 1609.344 from CustomerInformation ciFinding where ciFinding.Geocode.STDistance(@g) is not null and ciFinding.Geocode.STDistance(@g) &lt; 1609.344 order by ciFinding.Geocode.STDistance(@g) </code></pre>
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    1. USPaul Mendoza
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