In This Chapter

The first part of this chapter answers the following basic questions about the database server mirroring feature:

• What are the benefits of mirroring?
• What are the costs of mirroring?
• What happens if you do not mirror?
• What should you mirror?
• What mirroring alternatives exist?

The second part of the chapter discusses the actual mirroring process. The following aspects of the process are discussed:

• What happens when you create a mirror chunk?
• What are the mirror status flags?
• What is recovery?
• What happens during processing?
• What happens if you stop mirroring?
• What is the structure of a mirror chunk?

For instructions on how to perform mirroring tasks, refer to Using Mirroring.