Ms Sql Deadlock Error Number
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Deadlock In Sql Server 2008 How To Avoid Deadlock
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Sql Server Deadlock Trace
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Sql Server Deadlock Graph
of this site About Us Learn more about Stack Overflow the company how to remove deadlock in sql server 2008 Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges sql deadlock victim Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: https://technet.microsoft.com/en-us/library/aa175791(v=sql.80).aspx Sign up How to catch SqlException caused by deadlock? up vote 66 down vote favorite 19 From a .NET 3.5 / C# app, I would like to catch SqlException but only if it is caused by deadlocks on a SQL Server 2008 instance. Typical error message is Transaction (Process ID 58) was deadlocked on lock resources with another process and has been http://stackoverflow.com/questions/2256939/how-to-catch-sqlexception-caused-by-deadlock chosen as the deadlock victim. Rerun the transaction. Yet, it does not seem to be a documented error code for this exception. Filtering exception against the presence of the deadlock keyword in their message seems a very ugly way to achieve this behavior. Does someone know the right way of doing this? .net sql-server-2008 deadlock try-catch sqlexception share|improve this question edited Feb 13 '10 at 8:32 AdaTheDev 79.8k13131154 asked Feb 13 '10 at 8:26 Joannes Vermorel 4,65564084 1 I (finally) found the documentation for the error code: msdn.microsoft.com/en-us/library/aa337376.aspx. You can also find this through SQL Server itself: select * from master.dbo.sysmessages where error=1205 –Martin McNulty Feb 7 '13 at 14:13 add a comment| 2 Answers 2 active oldest votes up vote 103 down vote accepted The Microsft SQL Server-specific error code for a deadlock is 1205 so you'd need to handle the SqlException and check for that. So, e.g. if for all other types of SqlException you want the bubble the exception up: catch (SqlException ex) { if (ex.Number == 1205) { // Deadlock } else throw; } A handy thing to do
Server Deadlocks by Example 16 January 2014SQL Server Deadlocks by ExampleWhen a SQL Server instance deadlocks, it can be anything from minor irritation to something far more severe. In this article, Gail Shaw looks at how you can identify common https://www.simple-talk.com/sql/performance/sql-server-deadlocks-by-example/ types of deadlock, the difference between a deadlock and severe blocking, and how to avoid and fix the most common deadlock types. 83 26 Gail Shaw For each type of deadlock, we'll review ‘typical' deadlock graphs and discuss the signature http://www.codeproject.com/Articles/42547/SQL-SERVER-How-To-Handle-Deadlock that distinguishes each one, so that you can recognize it if you see it on your own systems. We'll also consider the root causes of each type of deadlock, the code patterns that make them a possibility, how to avoid sql server them recurring, and the need to deal with deadlocks, and all other SQL Server errors gracefully, with error handling and retries. The Difference between Severe Blocking and Deadlocking In my experience, developers and DBAs often think that their SQL Server instance is experiencing deadlocks when, really, it is experiencing severe blocking. Blocking occurs when session A requests a lock on a resource (typically a row, page or table), but SQL Server cannot grant that lock because session B already holds deadlock in sql a non-compatible lock on that resource. For example, let's assume that session B is in the process of modifying a row in the Invoices table. The session's associated process (thread) currently holds an Intent-Exclusive (IX) lock on both the table and the page that contains the row, and an X lock on the row. Simultaneously, session A needs to read a few pages on same table. Its associated process acquires an Intent-Shared (IS) lock on the table (since IS and IX lock mode are compatible) and then attempts to acquire an S lock on the pages it needs to read. However, session B's process holds an IX lock on one of the pages that contains some of the rows session A needs. S locks and IX locks are incompatible, and so session B's thread blocks session A's until the former completes its work and releases the locks. Lock modes and lock compatibility I don't have space in this piece for a fuller discussion of lock modes and compatibility. See Further Reading at the end of the article for some useful references. This is a transient situation and can be completely resolved by the session B completing its work and releasing its locks. It is possible to have extensive blocking chains where multiple sessions are blocked waiting for a session that itself is blocked waiting for another session that is blocked and so on, repeating multiple time. However, at
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