MS SQL Server Mirroring v/s MS SQL Always on MS SQL Server Mirroring and Always On Availability Groups are both high-availability and disaster recovery solutions provided by Microsoft SQL Server, but they have some key differences: SQL Server Mirroring: MS SQL Server Mirroring is an older technology and has been deprecated in newer versions of SQL Server. Mirroring works on a per-database basis, meaning that each database needs to be individually configured for mirroring. It uses a principal and mirror server configuration, where the principal server handles client connections and the mirror server maintains a synchronized copy of the database. Automatic failover is possible in high-safety mode with the help of a witness server, which monitors the availability of the principal server. Mirroring supports synchronous and asynchronous replication modes. Mirroring is limited to two servers and does not provide read scalability. Mirroring is available in the Standard and Enterprise editions...
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