Groups > comp.databases.ms-sqlserver > #734

Re: trying to replace multiple update statements with one update

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: trying to replace multiple update statements with one update
Date	Tue, 04 Oct 2011 23:14:59 +0200
Organization	Erland Sommarskog
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migurus (migurus@yahoo.com) writes:
> SQL 2005, there is a table with some 20,000 rows updated quite
> frequently, estimates are 2000 updates per minute. Many updates affect
> several records at once, so each update touches approximately 10 - 15
> records.
> 
> I am trying to come up with solution that avoids multiple updates with
> one update, thinking that it is less load on the db locking etc... The
> idea is for the app to declare a variable type of table, populate it
> with key - value pairs and then issue one update statement that will
> join the in memory table with the table.

Sounds like an excellent idea!

The only hickup is that SQL 2005 does not support table-valued parameters;
you need SQL 2008 for that.

However, rather than passing a TVP, you can pass the values in an XML
document, and then update the table from that document. See
http://www.sommarskog.se/arrays-in-sql-2005.html#XML for an 
introduction.
 

-- 
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

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trying to replace multiple update statements with one update migurus <migurus@yahoo.com> - 2011-10-03 18:11 -0700
  Re: trying to replace multiple update statements with one update Erland Sommarskog <esquel@sommarskog.se> - 2011-10-04 23:14 +0200
  Re: trying to replace multiple update statements with one update --CELKO-- <jcelko212@earthlink.net> - 2011-10-05 09:21 -0700
    Re: trying to replace multiple update statements with one update Erland Sommarskog <esquel@sommarskog.se> - 2011-10-05 23:44 +0200

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