What Is Database Mirroring?
When you mirror a database, you are essentially asking for a complete copy of a database to be created and maintained, with as much up-to-the-second completeness as possible; you are asking for a mirror image. Database mirroring is a database-level feature. This means that there is no support for filtering, sub-setting, or any form of partitioning. You mirror a complete database or nothing at all. This limitation actually keeps database mirroring simple and clean to implement. It also certainly provides some drawbacks, such as burning up twice the amount of disk storage, but what you get in return is well worth the cost in storage.
Database mirroring works through the transaction log of the principal database (of ...
Get Microsoft® SQL Server 2012 Unleashed now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
