Comments on: SQL SERVER – Find Busiest Database

By: Graeme Martin

Graeme Martin — Thu, 21 Feb 2013 15:07:51 +0000

CROSS APPLYing, not CROSS JOINing, eh?

By: SQL SERVER – Weekly Series – Memory Lane – #012 « SQL Server Journey with SQL Authority

Sat, 19 Jan 2013 01:31:10 +0000

[...] Find Busiest Database In my early career I was asked to how to find which is the busiest database in any SQL Server Instance. What he really meant by this is which database was doing lots of read and write operation. To find the answer to this question I decided to look into the DMV which contains all the details of the executed query. From the DMV sys.dm_exec_query_stats I found three most important columns to determine busiest database. [...]

By: Snehal

Snehal — Fri, 10 Sep 2010 09:48:48 +0000

Thanks a Lot.

Sir, with this query can we make assumption that a DB is read or write intensive? And furthermore can we make suggetion for raid levels i.e. 5 or 10.?

By: Pinal Dave

Pinal Dave — Tue, 23 Feb 2010 16:10:31 +0000

Hello Abhikit,

A dynamic statment, can be executed in any database and the sql_handle is not associated with any db_id. So it can interpreted that all batch that are not associated with any db_id are adhoc statements.
For more information see the page:
http://connect.microsoft.com/SQLServer/feedback/details/374600/sys-dm-exec-query-stats-dbid-column-null-for-dynamic-sql

Regards,
Pinal Dave

By: Abhijit

Abhijit — Tue, 23 Feb 2010 07:31:46 +0000

Pinal,
Here we can see the AdhocSQL databasename in the list .What does that mean?

By: Raj

Raj — Tue, 02 Feb 2010 04:44:46 +0000

There are so much to learn. With DMV’s we could do lot of analysis on production environments.

By: siva

siva — Mon, 01 Feb 2010 07:25:40 +0000

Please send this query for sql 2000

I am not aware of any workaround for SQL Server 2000.

By: Phani

Phani — Tue, 19 Jan 2010 06:39:43 +0000

Hi,

Visit the link http://msdn.microsoft.com/en-us/library/ms188754.aspx to get the whole list of Dynamic Management Views, different categories and detailed explanation.

Regards,
Phani

By: Kuldip.Bhatt

Kuldip.Bhatt — Mon, 18 Jan 2010 05:21:15 +0000

Hello Sir,
Nice Script.
is there any way we find the busiest Table in a database ?

By: Daniel

Daniel — Fri, 15 Jan 2010 22:35:38 +0000

Hi Pinal,

Great tip, thanks. We have some information about databases now, can we get the same information about tables (most read and write tables) additionally?

By: Ramdas

Ramdas — Fri, 15 Jan 2010 14:20:25 +0000

Hi Pinal,
Thanks for the script, Nice discussion around this topic.

By: pinaldave

pinaldave — Fri, 15 Jan 2010 07:23:14 +0000

Thanks Phani,

I appreciate your suggestions here. This will help every body who will ready this post.

It really helps community when a single topic is discussed by experts and added so much valuable information.

Kind Regards,
Pinal

By: Phani

Phani — Fri, 15 Jan 2010 07:15:59 +0000

Thought to share another couple of DMVs which I guess would be of help to production DBAs. There is one DMV on connections existing on the server “sys.dm_exec_connections” and one on the sessions “sys.dm_exec_sessions”. It provides lots of details along with resource consumption as well. HTH

By: pinaldave

pinaldave — Fri, 15 Jan 2010 05:22:06 +0000

Thanks Ben,

I think your comment is very valuable to this post. This way anybody who will read this post will realize the limitation of this DMV and will be appropriately use this script.

Kind Regards,
Pinal

By: Benjamin Nevarez

Benjamin Nevarez — Fri, 15 Jan 2010 04:38:20 +0000

I totally agree with Adam, this DMV will not give you the information you are looking for. Plus not every plan is cached and some cached plans can be removed by memory pressure.

Ben

By: Sundar Manmohan

Sundar Manmohan — Fri, 15 Jan 2010 01:25:34 +0000

dev,

You should also mention that this feature is also very useful to figure out how much Ad-Hoc queries are creating read and write in your system.

In fact, this was never known gem.

By: Narendra

Narendra — Thu, 14 Jan 2010 19:26:13 +0000

good post,

Started to use it today.

By: pinaldave

pinaldave — Thu, 14 Jan 2010 18:36:12 +0000

Thanks Adam for your reply for SQL Server 2000.
This helps.

By: Adam Machanic

Adam Machanic — Thu, 14 Jan 2010 18:25:16 +0000

The virtual file stats DMF will also reset with a service restart. The difference is, it actually reports the data you’re interested in seeing :-)

By: Adam Machanic

Adam Machanic — Thu, 14 Jan 2010 18:24:19 +0000

The workaround for SQL Server 2000 is to use the correct approach to begin with and use the fn_virtualfilestats function–the precursor to the virtual file stats DMF.

By: SQL Margie

SQL Margie — Thu, 14 Jan 2010 17:53:09 +0000

DMV sys.dm_exec_query_stats resets when services are reset, where as DVF sys.dm_io_virtual_file_stats works with server restart.

My needs are more related to service restart.

By: Jeff

Jeff — Thu, 14 Jan 2010 17:42:38 +0000

Ah, that would be the case, thanks. That would explain why my AdHocSQL is one of the biggest.

I have several databases used by very small internal applications that are only using ad hoc queries.

By: SQL Margie

SQL Margie — Thu, 14 Jan 2010 17:39:44 +0000

Nice!

I absolutely see it working on my computer.

Jeff,

It may be you are running only dymanic query and that could be the reason. In our infra, we use SP and it is giving me very accurate details.

Margie

By: pinaldave

pinaldave — Thu, 14 Jan 2010 17:25:11 +0000

I am not aware of any workaround for SQL Server 2000.

By: pinaldave

pinaldave — Thu, 14 Jan 2010 17:24:48 +0000

Jeff,

As this is DMV it will only show the data from last services restart. Is that the case, with you?

Kind Regards,
Pinal