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.

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 CDCfrom that table and re-create it or while activating CDCfor 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 CDClater 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 CDCthat 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    
GO
–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
GO
–know in details like which table is CDC enabled
–which is the capture instance of that table
EXEC sys.sp_cdc_help_change_data_capture
GO
–disable CDC from your table.
EXECUTE sys.sp_cdc_disable_table
    @source_name = N’ChangeDataCapture’,
    @source_schema =N’dbo’,
    @capture_instance =N’dbo_ChangeDataCapture’;
   
–disable CDC from your database
EXEC sys.sp_cdc_disable_db
GO
Reference: Ritesh Shah

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Author: Riteshshah

Ritesh Shah is a database professional with having 16+ years of experience in various domain of IT field. He is a author of many technical articles on Microsoft Technology and authored a book of SQL Server 2012 Performance Tuning cookbook. He loves work with different Microsoft Products.