Query Executes Faster In Grid Mode Than In Text Mode!!
Mar 9, 2000
Hello,everyone!!
There is a query which when executed in the grid mode(ctrl+d) takes approx 0.02 seconds(about 21,000
rows) But when I execute in the text mode, it takes about 0.40 seconds!!
Why is this difference?
Also, when the records from this table are read from a VB application, they are equally slow (as in the text mode!)
Why is it so slow on the text mode & relatively faster in the grid mode?
Has anyone got any idea on ‘Firehose’ style cursor ?(which may speed up access of data in the VB application)
I apologize for the long post but I am trying to give as much information as I can about the steps I've taken to troubleshoot this.
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Does anyone know why sql server is generating such an inefficient execution plan for the stored proc compared to the execution plan that it generates when executing the raw sql statement? The only thing I can think of is that some stats are not updated and that somehow throws off the stored proc. But then again, shouldn't it affect the raw sql statement?
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QUERY with SQL2008 compt level - finished in 2 minutes. QUERY with SQL2014 compt level - finishes in 3 hours 22 minutes.
same exact query - same server - only thing changed was compatibility level.
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I have a very frustrating problem. But given that this is a development forum, I'll keep that for my 'Envelope Lickers Rehab' and instead talk about an issue I'm having.
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-- The purpose of this script is to demonstrate that -- two queries against a columnstore index that each execute in batch mode -- will continue to execute in batch mode when inner joined. -- However, one of the queries will execute in row mode when cross-joined.
-- Create function to return 0 to n rows IF OBJECT_ID('dbo.IntCount') IS NOT NULL DROP FUNCTION dbo.IntCount;
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