Comments on: SQL SERVER – Find Most Expensive Queries Using DMV

By: Dima

Dima — Mon, 08 Apr 2013 17:24:45 +0000

Hi, thanks for a wonderful query. What is the way to find out which SPID’s are running these queries?. Thanks in advance

By: Sathish (@apshathish)

Sathish (@apshathish) — Tue, 12 Feb 2013 16:24:55 +0000

Hi all, Is it possible to get top 10 sql for our time frame?

By: sahil bangerwa

sahil bangerwa — Wed, 23 Jan 2013 12:15:55 +0000

update bcz it has to overwrite the data.If any index is on table then it has to modifi that and if that index is clusterd index then that index arrange itself in assinding order.

By: sondurak

sondurak — Sat, 15 Dec 2012 10:35:52 +0000

The second argument is the starting place. Using the statement start offset and statement end offset, we have to divide by two because the offset is in bytes and the text is Unicode. In this argument only, we must add 1 because the statement_start_offset and statement_end_offset are 0 based whereas the substring function is 1 based. This is correct in this function.

By: Shadab Shah

Shadab Shah — Wed, 03 Oct 2012 08:48:05 +0000

Sir, I would like to know why have you done (qs.statement_start_offset/2)+1

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Wed, 03 Oct 2012 01:31:17 +0000

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By: Girijesh Pandey

Girijesh Pandey — Tue, 02 Oct 2012 07:05:15 +0000

Hi Pinal,

Nice post, quite helpful while working for Query optimization.

Regards,
Girijesh

By: MDS

MDS — Sat, 21 Jul 2012 04:21:15 +0000

Does running these DMVs in itself cause any performance overhead. My DBA is of the opinion that running these queries in itself cause an overhead. Can anyone please provide me concrete data/proof that these DMVs are not resource intensive

By: Stefano Gioia

Stefano Gioia — Mon, 23 Apr 2012 20:40:35 +0000

Rohit: It works on 2005. If you cant make it work, check the database compatibility. There are a lot of good query DMV Scripts (search for DMV Allstars)

Vick: Since 2000 doesnt have DMVs, go for the ol’ fashioned SQL Profiler or automated scripts that select and record the sysprocesses / DBCC NPUTBUFFER output.

By: Rohit Paliwal

Rohit Paliwal — Wed, 18 Apr 2012 11:54:29 +0000

It seems it doesn’t work on 2005 :(

By: Vick

Vick — Wed, 14 Mar 2012 16:52:25 +0000

Any idea for DB running on Sql 2000? Please?

By: abhi

abhi — Fri, 03 Feb 2012 11:27:12 +0000

out of following commands which one is most costly:

1)Insert
2)Update
3)delete
4)truncate

If possible please provide the reason also.

By: Sasi

Sasi — Thu, 10 Nov 2011 19:35:38 +0000

check your database compatibility

By: Adam Durr (@SQLClimber)

Adam Durr (@SQLClimber) — Thu, 27 Oct 2011 17:33:47 +0000

Check the compatibility level of the database. If its in SQL 2000 mode then this query will not work.

By: madhivanan

madhivanan — Wed, 13 Jul 2011 13:20:45 +0000

It is based on the actual data stored.

By: suresh

suresh — Wed, 13 Jul 2011 06:50:41 +0000

Morning Pinal,

i hava a doubt .. how the memory allcation will be in creation of table in sql server…

create table test
(
name varchar(10)–
)

means in sql server the memory allocation will be like bit or bytes…

if i declared name varchar(10) the memory allocation will be based on the seze or byte wise

Plz give me earlier responce..

Regards
Suresh..

By: Jorge Rosete

Jorge Rosete — Tue, 21 Jun 2011 16:06:03 +0000

I ran the script on a database but the result was empty, i ran again in another database and works why is that? the statistics are enabled

By: Robin

Robin — Wed, 13 Apr 2011 15:02:31 +0000

Thank you for the script Pinal. Do you have a workaround for SQL 2008? It doesn’t appear to work with .sql_handle’.

By: rob

rob — Fri, 18 Feb 2011 16:54:47 +0000

How can I add the database name to this query?

By: vipul

vipul — Wed, 09 Feb 2011 17:00:08 +0000

Dear Sir / Madam

I have problem in sql server 2008

(1) I am using service brokar for messaging purpose , my application every three second read message ( binary to xml ) and send to web client this method lot of resource use , then any alternative method available in sql server ?

(2) in statics update lot of _wa_sys file this is effect performance or not ? if performance effect then delete or not ?
Please tell soluation as soon as possible …

Regards

By: Sudeep

Sudeep — Fri, 28 Jan 2011 19:52:55 +0000

just delete that ‘– ‘ and type that again.

By: Todd

Todd — Sat, 17 Jul 2010 09:55:00 +0000

Gaurav,

I get a syntax error on both of your queries:
Msg 102, Level 15, State 1, Line 8
Incorrect syntax near ‘-’.

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Mon, 31 May 2010 01:32:19 +0000

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By: Gaurav Mittal

Gaurav Mittal — Tue, 18 May 2010 14:39:27 +0000

Here is what the scripts I have…this gives the original source of the query which helps in making any changes to query

–Queries taking longest elapsed time:
SELECT TOP 10
qs.total_elapsed_time / qs.execution_count / 1000000.0 AS average_seconds,
qs.total_elapsed_time / 1000000.0 AS total_seconds,
qs.execution_count,
SUBSTRING (qt.text,qs.statement_start_offset/2,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE qs.statement_end_offset END – qs.statement_start_offset)/2) AS individual_query,
o.name AS object_name,
DB_NAME(qt.dbid) AS database_name
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
LEFT OUTER JOIN sys.objects o ON qt.objectid = o.object_id
where qt.dbid = DB_ID()
ORDER BY average_seconds DESC;

–Queries doing most I/O:

SELECT TOP 10
(total_logical_reads + total_logical_writes) / qs.execution_count AS average_IO,
(total_logical_reads + total_logical_writes) AS total_IO,
qs.execution_count AS execution_count,
SUBSTRING (qt.text,qs.statement_start_offset/2,
(CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE qs.statement_end_offset END – qs.statement_start_offset)/2) AS indivudual_query,
o.name AS object_name,
DB_NAME(qt.dbid) AS database_name
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
LEFT OUTER JOIN sys.objects o ON qt.objectid = o.object_id
where qt.dbid = DB_ID()
ORDER BY average_IO DESC;

By: Ramdas

Ramdas — Fri, 14 May 2010 17:55:51 +0000

thanks for the script, do you know if there is a dmv which is equivalent to sp_who2.
Thank you