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8.7

Stored procedure slow from VB.NET, fast from SSMS

Asked by gunman69 in MS SQL Server, .NET, Visual Basic Programming

Tags: SQL Server 2005, VB.NET, stored procedure, performance

I have an SP that takes 23 parameters, and the result set depends (of course) on the parameters.
In this particular scenario (i.e. with a specific set of values for the parameters) the SP returns 30 000 rows, with around 150 columns.

When I run the SP directly from the query window in SSMS, the SP executes at around 50 secs (completely, with output result in the result window). The "Reads" columns in the profiles states 1927431 reads.
When I execute the SP from VB.NET, it now takes more than 20 minutes, and the "Reads" column states a much greater value (unfortunately I don't have right now, but it's at least 100 times greater).

In VB.NET, I call ExecuteReader. For testing purposes, I have removed the code that iterates over the IDataReader which is returned. In other words, I dont pull much data from SQL Server to the VB.NET process (or at least that's the way I think it works).

The VB.NET executable lives on the same machine as SQL Server, whereas SSMS and SQL Server are on different machines (separated with a slow network)

Note that I THINK that the call from VB.NET sometimes executes at around the same time as from within SSMS (under a minute). I am not sure, since I haven't worked with this code for long myself.

Any ideas what can cause the performance difference?

Perhaps I am completely wrong, but to me it looks like SQL Server picks different execution plans, when I perform the call from SSMS v.s. when I call from VB.NET. (Because of the big difference in number of reads).

Thanks!
/Fredrik
[+][-]11/06/09 07:44 AM, ID: 25760056Accepted Solution

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About this solution

Zones: MS SQL Server, .NET, Visual Basic Programming
Tags: SQL Server 2005, VB.NET, stored procedure, performance
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Solution Provided By: emoreau
Participating Experts: 3
Solution Grade: A
 
[+][-]11/06/09 06:37 AM, ID: 25759423Expert Comment

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[+][-]11/06/09 07:20 AM, ID: 25759836Author Comment

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[+][-]11/06/09 07:46 AM, ID: 25760077Expert Comment

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[+][-]11/06/09 05:33 PM, ID: 25764562Expert Comment

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[+][-]11/06/09 11:22 PM, ID: 25765298Author Comment

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[+][-]11/07/09 05:28 AM, ID: 25766238Expert Comment

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