11.4. Mirroring modes
Later in the chapter we'll go through the process of preparing for and setting up a mirroring session. For now, let's concentrate on the process behind the delivery of transactions from the principal to the mirror during a mirroring session, and how this process is performed based on the mirroring mode.
A database mirroring session begins with the mirror instance identifying the log sequence number (LSN) of the last transaction applied to the mirror database. The mirror instance then obtains any outstanding transactions from the transaction log of the principal database. The outstanding transactions received from the principal instance are written to the transaction log of the mirror database and rolled forward. The outstanding ...
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