SQL Server 2008 change data capture vs triggers in audit trail

Question

We have audit trail implemented using triggers on our web application. Those triggers log field level updates. So, in a table, if you have 5 column values changed, we have 5

Answer 1

I use CDC in my WPF app. Works very well but I've discovered three problems:

• You need to back-up change tables quite often (I use MERGE statement to add records to historical tables). Because record stays in change table only for about 2-3 days as I found out. Don't forget to backup cdc.lsn_time_mapping table.
• You can't truncate tables with CDC enabled.
• There is a problem with disabling cdc and reenabling (should be solved in new service pack as MS said). I've got this problem only once so it's not so annoying.

  http://blogs.technet.com/b/claudia_silva/archive/2010/06/04/cdc-cdc-hangs-when-i-try-to-disable-it.aspx

Anyway, CDC is very useful mechanism which helps me track all changes on database.