- **Advanced data corruption protection**. The Business Critical tier leverages database replicas behind-the-scenes for business continuity purposes, and so the service also then leverages automatic page repair, which is the same technology used for SQL Server database [mirroring and availability groups](/sql/sql-server/failover-clusters/automatic-page-repair-availability-groups-database-mirroring). In the event that a replica can't read a page due to a data integrity issue, a fresh copy of the page will be retrieved from another replica, replacing the unreadable page without data loss or customer downtime. This functionality is applicable in General Purpose tier if the database has geo-secondary replica.
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