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Dead Locks in SQL Server

Posted on 2013-01-02
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Last Modified: 2013-01-11
Hi,
Please help me to resolve this issue.

We are using SQLSentry tool to monitor our DB server. We got below alert.

Environment: SQL Server 2005 Std With SP2 on Windows Server 2003 Ent

Please help why we are getting below deadlock

[Connection]:  abc.xyz.com
[Message]:  SQL Server Deadlock Detected
[Event Time]:  12/22/2012 3:52:10 PM
----------------------------------------------------------------------
[Timestamp (Local)]:  12/22/2012 3:52:10 PM
[Timestamp (UTC)]:  12/22/2012 11:52:10 PM
[Generated By]:  SQL Sentry 7.2 Server [SQLQADB02]
[Version]:  7.2.54.0
[Monitor Type]:  SqlServerProfiler
[Condition]:  SQL Server: Deadlock
[Response Ruleset]:  Notify Every Time (default)
----------------------------------------------------------------------
[Deadlock Victim Information]:
SPID [ecid]: 707 [0]
Host: host15
Application: .Net SqlClient Data Provider
Database: databse01
Login: WebServer
Log Used: 0
Deadlock Priority: 0
Wait Time: 1484
Transaction Start Time: 12/22/2012 3:52:09 PM
Last Batch Start Time: 12/22/2012 3:52:09 PM
Last Batch Completion Time: 12/22/2012 3:52:09 PM
Mode/Type: S
Status: suspended
Isolation Level: read committed (2)
Text Data:
    at databse01.dbo.up_Getads2 line 24
      SELECT
        H.ID as ID,
        H.ParentID as PID,
        RTRIM(REPLACE(REPLACE(REPLACE(H.Subject,'&amp;',  '&'), '&lt;', '<'), '&gt;', '>')) as T,
        dbo.fn_ConvertToXmlDate(H.PostDate) as D,
        RTRIM(REPLACE(REPLACE(REPLACE(H.PreviewText,'&amp;',  '&'), '&lt;', '<'), '&gt;', '>')) as PT,
        CASE
                WHEN Anonymous = 0 THEN RTRIM(U.Handle)
                ELSE 'Anonymous'
        END as A,

        CASE
                WHEN H.PollID = -1 THEN NULL
                ELSE 1
        END as P,

        CASE
                WHEN Status & 163
Client Options 2: 128056
Client Options 1: 538968096
Is Victim: True
Wait Resource: KEY: 5:72057594065518592 (2c00ac28262b)
Transaction Count: 0
Lock Timeout: 4294967295
SPID: 707
ECID: 0
Transaction ID: 423751167
Transaction Name: XML SELECT
Database ID: 5

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msghdrs-deadlock.JPG
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Question by:spkvijay
  • 2
5 Comments
 
LVL 15

Expert Comment

by:Anuj
ID: 38736928
Make sure you have proper indexes for this query, can you post the execution plans of this query?
0
 
LVL 42

Accepted Solution

by:
EugeneZ earned 500 total points
ID: 38738562
..can be many reasons:
the main one the code -- you need to include Catch -TRY for proc..
Isolation Level: read committed is contributing as well

more:
Minimizing Deadlocks
http://msdn.microsoft.com/en-us/library/ms191242(v=sql.90).aspx

Although deadlocks cannot be completely avoided, following certain coding conventions can minimize the chance of generating a deadlock. Minimizing deadlocks can increase transaction throughput and reduce system overhead because fewer transactions are:
• Rolled back, undoing all the work performed by the transaction.

• Resubmitted by applications because they were rolled back when deadlocked.


To help minimize deadlocks:
• Access objects in the same order.

• Avoid user interaction in transactions.

• Keep transactions short and in one batch.

• Use a lower isolation level.

• Use a row versioning-based isolation level.
¿ Set READ_COMMITTED_SNAPSHOT database option ON to enable read-committed transactions to use row versioning.

¿ Use snapshot isolation.


• Use bound connections.


Detecting and Ending Deadlocks
http://msdn.microsoft.com/en-us/library/ms178104(v=sql.90).aspx


SET DEADLOCK_PRIORITY
http://msdn.microsoft.com/en-us/library/ms186736(v=sql.90).aspx

Set READ_COMMITTED_SNAPSHOT

http://msdn.microsoft.com/en-us/library/ms173763(v=SQL.90).aspx
0
 

Author Comment

by:spkvijay
ID: 38739522
I've requested that this question be deleted for the following reason:

Posted wrong one
0
 
LVL 42

Expert Comment

by:EugeneZ
ID: 38739523
<Posted wrong one>? :)

it looks like good one to me
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