In this article we discuss the concept of Database Mirroring with special emphasis on its implementation in SQL Server
Now, that Microsoft has launched its SQL Server 2016, it’s time to learn about its interesting features like Database Mirroring. For those of you are still unaware of what database mirroring is like, let us acquaint you with it. Database mirroring is actually a way to increase the availability of an SQL Server Database. You must also know that this feature is implemented works only on those databases that incorporate a full recovery model. Learn in depth about Database Mirroring from the perspective of an SQL Server user.
Now, it’s time to learn about the whole concept of database mirroring in detail. Actually, there are two copies maintained in a database mirroring for a single database that reside on different server instances of the database engine. Once these copies are maintained on two different locations, a database mirroring session begins. It is important to know that out of the two database instances, one is used to serve the client or the principal server and the other is meant to act a standby server according to the configuration. Now, whenever a database mirroring session is synchronized, the database mirroring feature gives the standby server full support for rapid failover without any chances of data loss.
As an SQL Server user, you must also note that the primary and the mirror or standby servers cooperate and communicate as partners during a database mirroring session. Moreover, at a time one partner is in the primary role and the other acts as a mirror role and the role depends on the current situation of the server. On the other hand, one must also note that database mirroring also involves redoing inserts, updates and deleting operations occurring on the main database as well as on the mirror database.
Advantages of Database Mirroring
Let us now throw some light on the advantages of database mirroring. The first and most important benefit of using this feature as we mentioned ago, is that it enhances the availability of a database. For instance, if there is a disaster and you have faced data loss in your database, then this mirroring feature helps in bringing the standby copy of the database online. Another benefit of mirroring is that it enhances the data protection by providing almost full redundancy of the data according to the operating mode which can be either high performance or high safety. Third major benefit of database mirroring is that enhances the availability of the database for production during the upgrades and by this it minimizes the downtime for a mirrored database and allows the user to upgrade the instances that can host the partners for failover.
SQL Crashes are common and it is important to invest in a recovery solution
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Alan Chen is President & Chairman of DataNumen, Inc., which is the world leader in data recovery technologies, including access recovery and sql recovery software products. For more information visit https://www.datanumen.com/