Comments on: On Counts

By: sql-developer

sql-developer — Wed, 16 Feb 2011 20:39:53 +0000

There is a wrong assumption that sys.partitions uses statistics between many DBAs I talked to.
I’m happy to read that you have stated that it is not based on statistics.

By: Prakash

Prakash — Thu, 30 Jul 2009 13:58:50 +0000

Gail,

Thanks a Lot for the Wonderful Explanation..

By: Sm

Sm — Mon, 08 Jun 2009 11:39:25 +0000

Gail, Now just I have tested but all are same. may be its my dev box. but can you tell me how to calculate CPU time = 16 ms, elapsed time = 15 ms.. And also I tried with mine query Top 1 statements but no difference i found. Can u tell me y so?

Sm.

By: Sm

Sm — Mon, 08 Jun 2009 11:17:30 +0000

ok, let me test it ‘n Come back to you Gail..again..see you…then
Sm

By: Gail

Gail — Mon, 08 Jun 2009 09:12:51 +0000

Why don’t you test it out and tell me?

By: Sm

Sm — Mon, 08 Jun 2009 05:48:54 +0000

Gail,

Instead of “Select 1 from Tablename” IF we use “Select Top 1 ” will it decrease performance?

By: Gail

Gail — Thu, 04 Jun 2009 12:50:13 +0000

It should be.

By: VBindra

VBindra — Thu, 04 Jun 2009 11:07:31 +0000

Great article!
I think that COUNT(1) will also be treated in the same way as COUNT(*). Is it correct?

By: Christopher

Christopher — Wed, 13 May 2009 14:52:46 +0000

great article I loved this one and was brought back it today, when trying to help someone with a problem at SSC:
http://www.sqlservercentral.com/Forums/Topic714996-338-3.aspx

By: julio

julio — Fri, 01 May 2009 21:46:20 +0000

Excelente información para los que somos movatos