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Re: SSE 2008: Transactions and Rollbacks: When are they done?

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver, microsoft.public.sqlserver.programming
Subject	Re: SSE 2008: Transactions and Rollbacks: When are they done?
Date	Wed, 18 May 2011 07:27:20 +0000 (UTC)
Organization	Erland Sommarskog
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Gene Wirchenko (genew@ocis.net) writes:
>      The insert trigger fires.  At the first statement of the insert
> trigger's try block, @@trancount=1.  Why 1?

When you are in a trigger, you are always in a transaction. If you did not 
start one explicitly, there is still an implicit one defined by the 
statement that fired the trigger. This is an essential point: the trigger is 
part of the INSERT statemnet, and if the trigger fails, the INSERT statement 
should also be rolled back.

>      Supposedly, set xact_error on causes auto-rollbacks.  Fine, but
> the above happens with set xact_error off (unless I am actually not
> setting it in the right place.)

When you are in a trigger XACT_ABORT is ON by default. Furthermore, if you 
roll back the transaction in the trigger, the batch is aborted.

Error handling in SQL Server is a patchwork of inconsistencies. A lot 
inherited from Sybase, but Microsoft has been careful to add their own 
madness. Up to SQL 2000, an error in a trigger always aborted the batch, but 
starting with SQL 2005 you can prevent that with an explicit SET XACT_ABORT 
OFF in the trigger.

-- 
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

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Thread

SSE 2008: Transactions and Rollbacks: When are they done? Gene Wirchenko <genew@ocis.net> - 2011-05-17 15:09 -0700
  Re: SSE 2008: Transactions and Rollbacks: When are they done? Erland Sommarskog <esquel@sommarskog.se> - 2011-05-18 07:27 +0000
    Re: SSE 2008: Transactions and Rollbacks: When are they done? Gene Wirchenko <genew@ocis.net> - 2011-05-18 10:50 -0700
      Re: SSE 2008: Transactions and Rollbacks: When are they done? Erland Sommarskog <esquel@sommarskog.se> - 2011-05-18 23:39 +0200
        Re: SSE 2008: Transactions and Rollbacks: When are they done? Gene Wirchenko <genew@ocis.net> - 2011-05-19 13:10 -0700
          Re: SSE 2008: Transactions and Rollbacks: When are they done? Erland Sommarskog <esquel@sommarskog.se> - 2011-05-19 23:38 +0200
            Re: SSE 2008: Transactions and Rollbacks: When are they done? Gene Wirchenko <genew@ocis.net> - 2011-05-19 23:20 -0700
              Re: SSE 2008: Transactions and Rollbacks: When are they done? Erland Sommarskog <esquel@sommarskog.se> - 2011-05-20 07:32 +0000

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