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The purge process moves data between and deletes data from three categories of data, or data sets:
The current data set, which contains data that needs to be available to users. Users can change or review the data.
The history data set, which contains data that can only be reviewed or aggregated by users. Users can't change the data.
The dormant data set, which contains data that falls out of the availability threshold but needs to be stored to meet legal or business requirements. This data is archived, so it can't be changed, reviewed, or aggregated by users.
The purge process is configurable and dynamic, so new categories or subcategories can be added to accommodate changes in legal and business requirements. For example, the current data set could be further classified into read-only data and updateable data. By hosting the read-only data on read-only file groups, you can improve SQL Server performance.
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