What is Replication and Database Mirroring?

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Database mirroring can be used with replication to provide availability for the publication
database. Database mirroring involves two copies of a single database that typically reside
on different computers. At any given time, only one copy of the database is currently
available to clients which are known as the principal database. Updates made by clients to
the principal database are applied on the other copy of the database, known as the mirror
database. Mirroring involves applying the transaction log from every insertion, update, or
deletion made on the principal database onto the mirror database.