c# gtin Lesson 1: Overview of Database Mirroring in Visual C#

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Lesson 1: Overview of Database Mirroring
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You can use the following questions to test your knowledge of information in Lesson 1, Overview of Database Mirroring. The questions are also available on the compan ion CD if you prefer to review them in electronic form.
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which role is valid for Database Mirroring A. Publisher B. Principal C. Primary D. Monitor 2. Which of the following are valid actions for a witness (Choose all that apply.) A. Arbitrates a failover for the High Protection operating mode B. Arbitrates a failover for the High Availability operating mode C. Serves the database when the principal and mirror are offline D. Services multiple Database Mirroring sessions 3. Which of the following are endpoint options that are required for transactions to be exchanged between principal and mirror databases (Choose two; each answer represents a portion of a solution.) A. STATE configured with the default option B. Port 6083 specified for communications C. COMPRESSION set to ENABLED D. ROLE set to PARTNER
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Lesson 2: Initializing Database Mirroring
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You configure Database Mirroring on a database-by-database basis. Each database you define must use the Full recovery model to participate in a Database Mirroring session. Each mirror database needs to be synchronized with the principal using a backup before you start the mirroring session. This lesson walks through the four general steps you need to take to prepare for Database Mirroring: 1. Ensure that databases are set to use the Full recovery model. 2. Back up the primary database. 3. Restore the database to the instance hosting the mirror database by using the NORECOVERY option. 4. Copy all necessary system objects to the instance hosting the mirror database.
After this lesson, you will be able to:
Initialize Database Mirroring.
Estimated lesson time: 45 minutes
Real World
A customer with thousands of databases spread across hundreds of instances of SQL Server was looking for a reasonably straightforward availability strategy. The current solution was a hybrid of log shipping and replication. Replication was originally deployed for several of the systems because the customer wanted the capability to offload reporting activity. However, as the number of databases and instances grew, the burden on the dis tributor increased to the point at which they were running almost a dozen dif ferent distributors. Additionally, the management of the architecture was getting increasingly complex and posed a significant problem for new DBAs being added to the staff. After some careful analysis, it was determined that this customer had a need, not currently fulfilled by either replication or log shipping, for an automated failover for several of the databases. All the reporting activity on the subscribers could be accomplished with point-in-time copies of the data. The remaining databases did not need automated failover.
Lesson 2: Initializing Database Mirroring
Instead of extending the architecture and trying to design tools to enable the customer to more easily deploy and manage thousands of log shipping and rep lication sessions, the decision was made to replace the entire architecture with Database Mirroring. Beginning with the CTP 16 release of SQL Server 2005, we started to replace log shipping sessions with Database Mirroring in High Performance operating mode. After the initial group was implemented and the architecture was stabi lized, we replaced the remaining log shipping sessions on databases needing automatic failover with Database Mirroring running in High Availability operat ing mode. The replication sessions were left for last we replaced replication with Database Mirroring running in either High Performance or High Availabil ity operating mode, depending on the failover capability needed. We imple mented scheduled jobs that maintained a rolling set of Database Snapshots against the mirror database for the databases being used to scale out reporting capability. We replaced their entire architecture by the time SQL Server 2005 was released to the public and we have subsequently upgraded it to Service Pack 1. With more than 4,000 Database Mirroring sessions currently running, we know this is the largest implementation to date and we also know that Database Mirroring really works. With the implementation of Database Mirroring, we have been able to move five production DBAs over to development and enable more applications and features to be delivered than ever before. The only downside we found was the tool support for Database Mirroring. Because there was a complete lack of tools targeted at managing Database Mirroring architectures, we wrote our own GUI monitoring tools and are getting ready to move two more production DBAs to development on a part-time basis because our monitoring tools now enable a single DBA to monitor several hundred Database Mirroring sessions.
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