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High Protection operating mode transfers transactions synchronously, but does not have a witness server. The synchronous transfer guarantees that all transactions com mitted at the principal are first committed at the mirror, and it requires the same per formance considerations as the High Availability operating mode. However, the lack of a witness prevents automatic failover to the mirror in the event of a failure of the principal. 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 perfor mance while not offering the benefit of automatic failover, this operating mode is not recom mended 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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Exam Tip SQL Server 2005 Service Pack 1 has applied a slight change to the operating mode terminology. High Availability operating mode now appears as High Safety with automatic failover. High Protection operating mode now appears as High Safety without automatic failover. We will continue to use the terms High Performance, High Protection, and High Availability because you will see these terms on the exam as well as within virtually every piece of documentation written about Database Mirroring.
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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 ship ping 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 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 trans fers. 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 semihot 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 do if you use the other availabil ity technologies.
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Lesson 1: Overview of Database Mirroring
Transparent Client Redirect
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 Microsoft Data Access Components (MDAC) that ships with Microsoft Visual Studio 2005 contains a Database Mirroring related feature within the connection object called Transparent Client Redirect. When a client makes a con nection 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 write any code to implement this functionality. If a Database Mirroring session failed 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; the connection cache within MDAC would automatically redirect the connection to the mirror server. The applica tion would think it was connecting to the same server to which it was originally con nected, when in fact it is connected to a different server.
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