Change tracking captures the fact that rows in a table were changed, but does not capture the data that was changed. This enables applications to determine the rows that have changed with the latest row data being obtained directly from the user tables. Therefore, change tracking is more limited in the historical questions it can answer compared to change data capture. However, for those applications that do not require the historical information, there is far less storage overhead because of the changed data not being captured. A synchronous tracking mechanism is used to track the changes. This has been designed to have minimal overhead to the DML operations.
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