After reading my previous article on CDC (Change Data Capture), one of the reader had tried to do it in his development server but in his server, CDC was already enabled and another co-incident was that, the table he has choose for CDC, was already having its capture instance, may be any of the other team member might have done it and he doesn’t knew that , so he was greeted with the error like given below.
Msg 22926, Level 16, State 1, Procedure sp_cdc_verify_capture_instance, Line 36
Could not create a capture instance because the capture instance name 'dbo_ChangeDataCapture' already exists in the current database. Specify an explicit unique name for the parameter @capture_instance.
Error message is pretty much clear that the table he was using was already having capture instance so obviously he should use another table for this testing purpose or remove CDC from that table and re-create it or while activating CDC for that table, he has to provide another name for capture instance table by providing @Capture_Instance name explicitly (not recommended). I will provide TSQL needed from disable CDC later in this article.
Well, these are some of the solution when you face above given error message but as said by someone that “Prevention is better than cure”, that reader asked me how do I know even before activating CDC that the table is CDC enabled or not.
It is not a big issue; you can use very small TSQL queries like below when you want to know it.
--list out the name of databases which are CDC enabled
SELECT [name], database_id
FROM master.sys.databases WHERE is_cdc_enabled =1
--list out all tables which are CDC enabled in your database
SELECT [name] AS Table_name
FROM sys.tables WHERE is_tracked_by_cdc =1
--know in details like which table is CDC enabled
--which is the capture instance of that table
--disable CDC from your table.
@source_name = N'ChangeDataCapture',
@source_schema = N'dbo',
@capture_instance = N'dbo_ChangeDataCapture';
--disable CDC from your database
Reference: Ritesh Shah
Note: Microsoft Books online is a default reference of all articles but examples and explanations prepared by Ritesh Shah, founder of http://www.SQLHub.com
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