Comments on: SQL SERVER – Actual Execution Plan vs. Estimated Execution Plan

By: Ashok

Ashok — Wed, 06 May 2009 05:28:22 +0000

Thank u friend for given usefull information provided abt Exec plan..

By: Muralikrishna Reddy

Muralikrishna Reddy — Mon, 23 Mar 2009 05:49:57 +0000

Very Good.

Lot of information provided.

By: SQL SERVER - Guidelines and Coding Standards Part - 2 Journey to SQL Authority with Pinal Dave

Thu, 26 Feb 2009 12:14:43 +0000

[...] Use graphical execution plan in Query Analyzer or SHOWPLAN_TEXT or SHOWPLAN_ALL commands to analyze SQL queries. Your queries should do an “Index Seek” instead of an “Index Scan” or a “Table Scan”. (Read More Here) [...]

By: SQLAuthority News - Best Articles on SQLAuthority.com Journey to SQL Authority with Pinal Dave

Tue, 24 Feb 2009 12:10:33 +0000

[...] SQL SERVER – Actual Execution Plan vs. Estimated Execution Plan [...]

By: Divya

Divya — Thu, 22 Jan 2009 09:48:59 +0000

You are great!

By: Shyam

Shyam — Tue, 02 Dec 2008 06:49:00 +0000

Dear Dave,
Thanks for the useful information..

Regards,
ShyamSundar.S

By: Gnans

Gnans — Wed, 19 Nov 2008 16:37:59 +0000

Gud one

By: SQL SERVER - Stored Procedure WITH ENCRYPTION and Execution Plan Journey to SQL Authority with Pinal Dave

Sat, 01 Nov 2008 19:03:19 +0000

[...] To understand this scenario let us create two SPs. First without encryption and second with encryption. Once SPs are created run them one by one with having Actual Execution Plan turned on. To learn how to turn on Actual Execution Plan read my previous article SQL SERVER – Actual Execution Plan vs. Estimated Execution Plan. [...]

By: Alkesh khedle

Alkesh khedle — Wed, 06 Aug 2008 08:27:26 +0000

Could you please tell me how we could recognize that the statistics are not updated by looking in to the actual execution plan of the query.
What is Bookmark Lookup and RID Lookup.What are the difference between them.Are the performance booster or performance Killer.How we can remove those from our query plan.

By: Anil

Anil — Wed, 18 Jun 2008 06:10:31 +0000

Hi,
Can i see execution plan for Stored Procedure and triggers.
Thanks

By: Krishna

Krishna — Thu, 17 Apr 2008 21:51:40 +0000

Dave,

Thanks for the useful information..

–Regards,
Krishna

By: jerome gerald

jerome gerald — Fri, 28 Mar 2008 09:53:56 +0000

HI Dave,

I was not aware of the 2 Execution Plans. After seeing yours only i got to know that there are 2 types.

Thanks

By: jerome gerald

jerome gerald — Fri, 28 Mar 2008 09:50:28 +0000

HI Dave,

I was not aware of the 2 Execution Plans. After seeing yours only i got to know that there are 2 types.

Thanks

By: Anil

Anil — Wed, 05 Dec 2007 18:26:56 +0000

Hi,

Is there any way to get execution time for stored procedure in sql server 2005.

My requirement was i have display that execution time as waiting time..so tht user will wait till tht time.

By: Naga Sai Krishna

Naga Sai Krishna — Tue, 13 Nov 2007 14:19:50 +0000

Estimated execution plans will be useful when we are facing any query time out issues from the application.

As we all know that if we set showplan_all on we will get the estimated execution plan and which will be very useful some times.

By: Anonymus DBA

Anonymus DBA — Wed, 29 Aug 2007 16:11:15 +0000

Dave,

I find this post very useful. I now realize that I should have used Actual plan. I was using estimated plan, bad very bad.

thz.

By: pinaldave

pinaldave — Wed, 29 Aug 2007 14:47:51 +0000

Simon,

What you have said is correct. And as I said Estimated Execution plan may not be accurate and I do not use it.

Community is smart and I have explained them both the method and explained my preferred method. I think it is totally fair and appropriate to tell community what my opinion is. I will continue to do so.

As I said earlier, I do not want to end up here in big discussion and I have strong opinion about Actual Execution Plan.

Regards,
Pinal Dave ( http://www.SQLAuthority.com )

By: Simon Worth

Simon Worth — Wed, 29 Aug 2007 14:41:26 +0000

The problem with using Actual Execution Plan
and SET STATISTICS PROFILE ON is you don’t get the results until the query has completed.
This can be a problem when troubleshooting performance problems on long running queries. If the query you are trying to analyze doesn’t return the result set for 2 hours, then you have to wait 2 hours to see the actual execution plan.
Using show estimated execution plan give you the opportunity to see a best guess at what the SQL Engine is going to do when it executes the query, and allows the developer to see if what they have written is the best it can be.

So, while I agree that the Actual Execution Plan is ideal, it is not fair to tell others in the community that the Estimated Execution plan should not be used.
It is a valuable resource in the tool kit of SQL Developers and should not be overlooked when information about query processes is needed on long running queries.

By: Srikanth

Srikanth — Tue, 28 Aug 2007 15:50:26 +0000

Thanks Dave. I didn’t know that there are two options but I have always used actual execution plan.

I am wondering if you could write about how to use query plan to tweak a query for better performance?.

Thanks in advance.