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What do you use to find out what's slowing down your instance right now


What do you use to find out what's slowing down your instance right now

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sql-lover
sql-lover
SSCommitted
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This is not a DMV I wrote (can't remember where I found it, honestly) but it is the 1st thing I ran to find out what query is slowing down my system:


SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT [Spid] = session_Id
,ecid
, [Database] = DB_NAME(sp.dbid)
, [User] = nt_username
, [Status] = er.status
, [Wait] = wait_type
, [Individual Query] = SUBSTRING (qt.text, er.statement_start_offset/2,
(CASE WHEN er.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE er.statement_end_offset END - er.statement_start_offset)/2)
,[Parent Query] = qt.text
, Program = program_name
, Hostname
, nt_domain
, start_time
FROM sys.dm_exec_requests er
INNER JOIN sys.sysprocesses sp ON er.session_id = sp.spid
CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) as qt
WHERE session_Id > 50 -- Ignore system spids.
AND session_Id NOT IN (@@SPID) -- Ignore this current statement.
ORDER BY 1, 2




I like it because it shows the spid plus the actual T-SQL statement.
Jeff Moden
Jeff Moden
SSC Guru
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Points: 86043 Visits: 41096
GilaMonster (1/21/2014)
sys.dm_exec_requests join sys.dm_exec_sessions cross apply sys.dm_exec_sql_text.


That and a quick trip to the desk of the person who invoked the rogue query along with the appropriate pork chop launcher and a bat to help tenderize the target. ;-)

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
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GilaMonster
GilaMonster
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sql-lover (1/22/2014)

WHERE session_Id > 50 -- Ignore system spids.


Careful, spid < 50 indicating a system process hasn't been true since SQL 2000.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


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