Groups > comp.databases.ms-sqlserver > #156

Re: SSE 2008: Trigger: Modifying Data to be Written

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver, microsoft.public.sqlserver.programming
Subject	Re: SSE 2008: Trigger: Modifying Data to be Written
Followup-To	comp.databases.ms-sqlserver
Date	Sun, 10 Apr 2011 14:48:15 +0200
Organization	Erland Sommarskog
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Cross-posted to 2 groups.

Followups directed to: comp.databases.ms-sqlserver

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Gene Wirchenko (genew@ocis.net) writes:
>   2) I think that maintainability was covered by the code I borrowed
> from.  My derivative has
>           select * into #Inserted from Inserted
> at the beginning and then at the end, writes with
>           insert into Accounts select * from #Inserted

That should work. One of the few situations where SELECT * in production 
code could be defended.

Unfortunately, it will not work if the table has an identity column, a
timestamp column or a computed colunm.

I have also experienced performance problems with using SELECT INTO in a 
trigger which was written to handle multi-row inserts, but the transaction 
at hand was a loop that did things one-by-one. I found by testing that 
SELECT INTO was more expensive that using CREATE TABLE #temp, which in its
turn was more expensive than table variables. Then again, this was on SQL
2000, and it is possible that the temp-table caching in later versions 
alleviates the problem. I haven't come around to test that.

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

Links for SQL Server Books Online:
SQL 2008: http://msdn.microsoft.com/en-us/sqlserver/cc514207.aspx
SQL 2005: http://msdn.microsoft.com/en-us/sqlserver/bb895970.aspx

Thread

SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-08 15:11 -0700
  Re: SSE 2008: Trigger: Modifying Data to be Written "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2011-04-08 18:44 -0400
    Re: SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-08 16:23 -0700
      Re: SSE 2008: Trigger: Modifying Data to be Written Erland Sommarskog <esquel@sommarskog.se> - 2011-04-09 11:22 +0200
        Re: SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-09 21:29 -0700
          Re: SSE 2008: Trigger: Modifying Data to be Written Erland Sommarskog <esquel@sommarskog.se> - 2011-04-10 14:48 +0200
            Re: SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-11 09:46 -0700
          Re: SSE 2008: Trigger: Modifying Data to be Written "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2011-04-10 08:54 -0400
            Re: SSE 2008: Trigger: Modifying Data to be Written Erland Sommarskog <esquel@sommarskog.se> - 2011-04-10 21:33 +0200
            Re: SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-11 09:42 -0700
              Re: SSE 2008: Trigger: Modifying Data to be Written "Bob Barrows" <reb01501@NOyahooSPAM.com> - 2011-04-11 14:55 -0400
                Re: SSE 2008: Trigger: Modifying Data to be Written Gene Wirchenko <genew@ocis.net> - 2011-04-11 14:53 -0700
                Re: SSE 2008: Trigger: Modifying Data to be Written "Bob Barrows" <reb01501@NOSPAMyahoo.com> - 2011-04-11 18:49 -0400

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