Implementing Database Mirroring in .NET

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Implementing Database Mirroring
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Database mirroring s High Protection operating mode is the same as High Availability operating mode, except that you do not configure a witness server. SQL Server transfers transactions synchronously between principal and mirror, but because a two-outof-three quorum cannot be achieved without a witness, failover is manual. If the principal fails in High Protection operating mode, you must manually promote the mirror to serve the database.
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Because High Protection operating mode s synchronous transfer can affect application performance while not offering the benefit of automatic failover, this operating mode is not recommended for normal operations. You should configure a database mirroring session in High Protection operating mode only when you need to replace the existing witness server. After you have replaced or recovered the witness, you should change the operating mode back to High Availability operating mode.
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Each high availability technology available in SQL Server 2005 has performance and possibly application implications during a failover. Clustering avoids the application issues because it uses only one instance; however, the instance must restart on another node, thereby causing the data and query caches to be repopulated. Log shipping requires changes to the application to reconnect to the secondary server as well as requiring the data cache and procedure cache to be repopulated. Replication requires application changes to reconnect to a subscriber and has some performance impact because the query cache and part of the data cache would need to be repopulated. Database mirroring, however, does not have caching issues. In addition to sending transactions to the mirror, database mirroring also performs periodic metadata transfers. The purpose of these metadata transfers is to cause the mirror to read pages into data cache. This process maintains the cache on the mirror in a semi-hot state. The cache on the mirror does not reflect the exact contents of the cache on the principal, but it does contain most of the pages. Thus, when the database mirroring session fails over, SQL Server does not have to completely rebuild the cache, and applications do not experience as large a performance impact as they would if you had used the other availability technologies.
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Lesson 4: Understanding Operating Modes
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Transparent Client Redirection
One of the most difficult processes of failing over when using either log shipping or replication involves application connections. Applications must be redirected to the secondary server to continue processing. Database mirroring can avoid this necessity under a very particular configuration. The new version of MDAC that ships with Microsoft Visual Studio 2005 contains a database mirroring related feature within the connection object called Transparent Client Redirect. When a connection is made to a principal, the connection object caches the principal as well as the mirror. This caching is transparent to the application, and developers do not need to implement any code to implement this functionality. If a database mirroring session were to fail over while an application were connected, the connection would be broken, and the connection object would send an error back to the client. The client would then just need to reconnect, and the connection cache within MDAC would automatically redirect the connection to the mirror server. The application would think it was connecting to the same server to which it was originally connected, when in fact it is connected to a different server.
Quick Check
1. What are the three operating modes for database mirroring 2. Which mode is not recommended for normal operations
Quick Check Answers
1. The three operating modes are High Availability operating mode, High Performance operating mode, and High Protection operating mode. 2. High Protection operating mode is not recommended for normal operations because its synchronous transfers have high performance impact without the benefit of automatic failover.
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