![]() ![]() Check SQL Server Transaction Log Architecture for more information.When a change is performed, this change will be written to the Transaction Log file. When the feature is enabled on a SQL Server database table, two SQL Server Agent jobs will be created for that database the first job is responsible for populating database change tables with the changes information and the second job is responsible for the cleaning up the change tables by deleting the records older than the configurable retention period of 3 days.Ĭhange Data Capture depends on the SQL Server Transaction Log as the source of the data changes. This detailed information makes it easier to monitor the database changes for security or auditing purposes, or incrementally load these changes from the OLTP source to the target OLAP data warehouse, using T-SQL or ETL methods.Ĭhange Data Capture requires that a SQL Server Agent is running on a SQL Server instance. _$update_mask that is a bit mask defined for each captured column, identifying the updating columns. ![]() _$seqval that shows the order of that change related to other changes in the same transaction, _$operation that shows the operation type of the change, where 1 = delete, 2 = insert, 3 = update (before change), and 4 = update (after change). ![]()
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