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The SQL command used for performing a merge operation in Change Data Capture (CDC) is "MERGE INTO." This command allows you to combine data from two tables—typically a source and a target table—by inserting new records or updating existing records based on certain conditions.

The MERGE INTO statement is particularly important in CDC scenarios where you are tracking changes in data, such as additions, modifications, or deletions. It enables efficient synchronization of data between two datasets, ensuring that the target table reflects the most current state of the data in the source table.

This command supports a versatile approach where you can specify conditions for inserting new rows, updating existing rows, or even deleting rows if needed, all in a single statement. This capability is crucial for managing data efficiently and accurately as changes occur over time.

Thus, when dealing with data updates in CDC, using the MERGE INTO command is the appropriate choice for ensuring that your target dataset remains aligned with changes in your source dataset.