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Are my speed issues with remote MSSQL SELECT query (via php) caused by the connection or the server?

Posted on 2013-11-15
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Last Modified: 2013-11-20
Greetings,

I have a situation with a client (client A) where a SQL SELECT query is taking over 3 minutes.   Here is the query -

WITH MyProducts AS (SELECT ProductID, cast(GUIDProduct as varchar(36)) as myProductGUID, UpdatedDate, _Manufacturer, _Clearance, _Promotion, _HidePriceOnline, ProductType, Status, DATALENGTH(ProductPicture) as myImageSize, AvailOnWeb, SalesCategory, ProductClassID, ListPrice, Taxable, SalesUnit, Weight, Length, Color, Height, Width, Size, UPC, AltDescription, Description, OuterPackQty, TechSpec, ProductPicture , ROW_NUMBER() OVER (ORDER BY GUIDProduct) AS RowNumber FROM Product where UpdatedDate > '2013-11-14') SELECT * FROM MyProducts where RowNumber between 1 and 200

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The query is kind of complicated, because it returns 200 rows at a time from a dataset of recently updated records.   The subquery (MyProducts) has 20,000 rows for this client.  

On another client (client B), the same query takes less than one second and MyProducts subquery has 40,000+ records.  They are both on the same webserver.

How could I trace to see if the issue is with the internet connection or if there are problems with their SQL server?
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Question by:lthames
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3 Comments
 

Author Comment

by:lthames
ID: 39651314
Update -

This information might help -

This query takes over 3 minutes -
WITH MyProducts AS (SELECT ProductID, cast(GUIDProduct as varchar(36)) as myProductGUID, UpdatedDate, _Manufacturer, _Clearance, _Promotion, _HidePriceOnline, ProductType, Status, DATALENGTH(ProductPicture) as myImageSize, AvailOnWeb, SalesCategory, ProductClassID, ListPrice, Taxable, SalesUnit, Weight, Length, Color, Height, Width, Size, UPC, AltDescription, Description, OuterPackQty, TechSpec, ProductPicture , ROW_NUMBER() OVER (ORDER BY GUIDProduct) AS RowNumber FROM Product where UpdatedDate > '2013-11-14') SELECT * FROM MyProducts where RowNumber between 1 and 200

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But this query takes about a second -
SELECT top 200 ProductID, UpdatedDate, _Manufacturer, _Clearance, _Promotion, _HidePriceOnline, ProductType, Status, DATALENGTH(ProductPicture) as myImageSize, AvailOnWeb, SalesCategory, ProductClassID, ListPrice, Taxable, SalesUnit, Weight, Length, Color, Height, Width, Size, UPC, AltDescription, Description, OuterPackQty, TechSpec, ProductPicture FROM Product where UpdatedDate > '2013-11-14'

Open in new window


It is returning the same exact information on the first pass (rows 1 - 200), so can I assume this is not the internet connection?

Thanks!
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LVL 19

Accepted Solution

by:
strivoli earned 500 total points
ID: 39651482
Use the SQL Profiler to understand what happens, or, run the query locally and you will know how much it takes.
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LVL 2

Expert Comment

by:loki0609
ID: 39652060
Check your indexing. Whenever I've had slow queries it was because the row i was doing the where clause wasn't indexed.
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