Change Data Capture and Microsoft SQL Server Database

 

Data security is the prime concern of organizations today, with data breaches, leaks, and hacking becoming a very common occurrence. An important method to ramp up data security is saving changed data in the database so that the historical data is always preserved. For ensuring this, various databases have introduced different solutions over time such as triggers, complex queries, timestamps, and data audits.



In 2005, SQL Server introduced “after date”, “after insert”, and “after delete” features to enable SQL Server change data capture. But it did not address the issue fully and it was only in 2008 that Microsoft SQL Server launched the Change Data Capture technology where developers could capture and archive data without additional programming.

CDC or Change Data Capture is the process that tracks all changes made in user-created tables. These changes are stored in relational tables for quick retrieval and access later with the T-SQL. After the features of the CDC are applied to a database table, a replicated image is created of the same table.

SQL Server change data capture updates, deletes, inserts, and records all data that has been applied to a SQL Server table, the details of which are stored in a user-friendly format. All the information about metadata and column before the changes are made is captured for the modified rows. These are then stored in the changed tables and the complete column structure of the tracked source tables is replicated.

The SQL Server transaction log in the SQL Server change data capture process is the source of change in the CDC. In the case of modifications, the changes described in the entries are added to the log.

  

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