Sql query vs entity framework query with C# .NET

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I have observed an interesting behavior. There is a one complex query 'A' generated by Entity framework (I know this via logging) and there is another query 'B' the same query re - written via simple joins by DBA.

Now when we run 'A' and 'B' in SSMS then following is the execution time taken by each query.
A -> 1 min and 20 sec
B -> 21 sec

Now when I execute these query via a .net application using entity frame work.
A -> 25 sec
B -> 1 min

I am unable to understand why the change in the execution time. can any one shed some light on this.

I expected the same behavior when I ran the queries with .Net application and SSMS.

What I have tried:

I have tried searching online.Normally every where they have mentioned the reverse scenario. Slow in App fast in ssms. But for Query B it is reversed

Posted 29-May-17 2:03am

Saurabh.abhyankar

Updated 29-May-17 5:46am

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Maciej Los · Answer 1 · 2017-05-29T05:46:00

Your question is unanswerable for set of reasons, but two of them are most important:
1. we can not reproduce your issue,
2. we don't see your queries (EF and SQL)
3. we have no idea what these queries do.

At this moment i suggest to use, for example LinqPad, which can "convert" an EF query into its SQL form and vice versa. There you'll be able to compare time of execution.