What is Change Data Capture for SQL Server

 

In today’s data-driven business environment, the overriding concern is data breaches. Organizations try to solve this issue by ramping up data security to protect historical data. Hence, the top database platforms like Microsoft SQL Server and Oracle database have introduced various solutions like timestamps, complex queries, triggers, and data audits.



In 2005, SQL Server launched “after date”, “after delete”, and “after insert” features for SQL Server Change Data Capture (CDC). But that only partially solved the issue. In 2008 SQL Server introduced a modified version of CDC that turned out to be more effective. CDC helps to track and capture all the changes that are made on the SQL Server database tables without extra programming. In the initial stages up to 2016, SQL Server Change Data Capture was active only in the Enterprise Edition but now, it is a universal feature in the SQL Server.

CDC monitors the Insert, Update, and Delete operations in the table of a database. All these changes are recorded in detail in a mirrored table that has the same column structure as the source tables. There are additional columns too that records the descriptions of the changes made. It goes like this.

·        For every Insert statement, the SQL Server writes one record showing the inserted values.

·        For every Delete statement, the SQL Server writes one record showing the deleted values.

·        For every Update statement, the SQL Server writes two records. The first shows the data before the change is made and the second shows the value after the change has been made.

However, for SQL Server Change Data Capture it is essential that an Agent runs on a SQL Server instance.

 

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