All That You Need to Know About SQL Server CDC

In the modern business environment, data is to be protected data from breaches. Keeping this in mind, major database solution providers like Oracle and Microsoft had launched various initiatives like triggers, complex queries, timestamps, and data audits. The first player was Microsoft when in 2005 it launched SQL Server Change Data Capture (CDC) with “after date”, “after delete”, and “after insert” features. A modified version, introduced in 2008 and still being usedcan monitor and capture any changes made to the SQL Server database.

The functioning of the SQL Server change data capture feature is not a complex one. All changes like insert, update, and deletemade to a SQL Server tableare captured by Change Data Capture which then enters the details of the modifications in a user-friendly relational format.

Information about metadata and column structure necessary to apply changes to the target database are captured for the changed rows and stored in change tables. These tables replicate the column structure of the tracked source tables. Table-valued functions that enable users to have uninterrupted access to the full changed data are provided by SQL Server change data capture.

The source of CDC is the transaction log of the SQL Server. All changes like inserts, updates, and deletes that are applied to the tracked source tables are added to the log through entries describing the changes. Hence, the main input in the SQL Server change data capture process is the SQL Server log with modifications in the source database like Insert, Update, and Delete being tracked by the SQL Server Change Data Capture.

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