Tuesday, September 14, 2010

SQL Server Database Mirroring Pros and Cons

Here is the list of advantages and disadvantages of Database mirroring in SQL Server 2008.

Point 1: Database mirroring can be configured along with replication, log shipping, and database snapshots. 

Point 2: In SQL Server 2008 compresses the Transaction Log at Principal Server before it is transferred to mirror server so it saves lot of traffic bandwidth. 

Point 3: System databases can not be mirrored. 

Point 4: Database which needs to be mirrored it must be a FULL recovery mode, mirroring doesn't work on other recovery models. 

Point 5: High Safety Mode (Synchronous operation) Log are committed on Principal and Mirror when databases are synchronized. 

Point 6: High Performance Mode (Asynchronous operation) Principal commits and Mirror tries to keep up with received log records from Principal. 

Point 7: The mirrored server can not be used during mirroring operation, it always be on recovery mode. 

Point 8: We can take the snapshot of the mirrored database, for reporting purpose.

Point 9: Automatic Failover is only possible when high safety mode is configured with automatic failover.

Point 10: Database mirroring has automatic server failover and client failover capabilities.

Point 11: Configuration of database mirroring is simpler than any other high availability like log shipping and replication.
 
Point 12: Mirroring has built-in network encryption support (AES algorithm).
 
Point 13: Database mirroring supports full-text catalogs.

Point 14: If you are configuring witness server as well then additional SQL Server instances may be required.
Pros and Cons for Database . Basic about database mirroring. Evaluating SQL Server Database Mirroring as a Disaster Recovery. Reasons not to configure automatic failover for database mirroring. Database Mirroring vs Failover Clustering. SQL Server 2012 Database Mirroring. Mirroring vs. Log Shipping in Sql Server 2008 R2. Database Mirroring in the Real World. Database Mirroring Advantages & Disadvantages. SQL Server High Availability Options. Pros and cons of HA solutions. Database Mirroring or Clustering. Database Mirroring Architecture. SQL Mirroring Cons. Database Mirroring Issue. Database Mirroring error.

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