What is database mirroring in SQL Server 2008?
Database Mirroring is used to move the database transactions from one SQL Server database (Principal database) to another SQL Server database (Mirror database) on a different instance. In SQL Server Log Shipping and Mirroring can work together to provide solutions for high availability and disaster recovery.
How do I create a database mirroring in SQL Server?
To configure database mirroring, you can use the following procedure:
- Connect to the primary server.
- Ensure the database is at Full recovery model.
- Enable database mirroring.
- Configure database mirroring security.
- Define whether or not a witness server is used for automatic failover.
What is the difference between mirroring and always on?
Essentially you had to choose between using database mirroring for disaster recovery (asynchronous) or for high availability(synchronous). AlwaysOn, however, allows up to two synchronous replicas and two asynchronous replicas to be simultaneously active.
What is the difference between replication and mirroring in SQL Server?
Mirroring refers to keeping copies of database to a geographically different location. Replication referes to creating multiple copies of data objects of a database for distribution efficiency. Mirroring is applicable on complete database as a whole. Replication is done on database objects.
Which of the two would you prefer database mirroring or database replication?
Replication is cheaper as compared to Mirroring. Mirroring is not applicable in case of Distributed databases. Replication can be easily implemented in case of distributed databases. Mirroring is done to create a copy of database on different hardware and on different location to serve as backup location.
How do you mirror a database?
Getting Started
- Right click on the database and select Tasks>Mirror.
- Press the Configure Security button.
- The Configure Database Mirroring Security Wizard will be displayed.
- The first wizard will ask if you want a Witness.
- The next option will let you select where to save the security configuration.
What are the benefits of database mirroring?
SQL Server Database Mirroring Advantages
- Minimizes data loss.
- Provides a high availability of the database.
- Maintains full-text catalogs.
- Do not need any singular hardware.
- Provides automatic server failover in high safety mode.
- The log-transfer method provides a solution for database redundancy.
What are the prerequisites of mirroring in SQL Server?
The Prerequisites to configure the database mirroring are: Principal and mirror instance must be running on SQL Server 2005 SP1 and later edition. SQL Server version and edition must be the same on the principal and mirror instance. Principal and mirror databases must have the same name and database collation.
What things must be prepared before carrying out database mirroring?
To prepare a database for mirroring, you need to perform the following steps:
- Script the restore of the latest full database backup.
- Script the restore of every transaction log backup that has been made after that full database backup.
- Copy the full database backup and transaction log backups to the mirror server.
What is the relationship between synchronization and mirroring?
With Synchronize files mode, the newer files in source directory are transferred to the opposite directory. With Mirror files mode, the different (both newer and older) files in source directory are transferred to the opposite directory.