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This is an area where the DBA cannot work in isolation The amount of downtime and data loss that an organization can stand is a matter for the business analysts, not the DBA The business analysts in conjunction with the end users will determine the requirement, and the DBA will then configure the database appropriately To do this, you will require the cooperation of the system administrators and other support staff Sometimes there will be budget constraints to consider: a zero data loss and 100 percent uptime environment will be far more expensive to configure than an environment that does not have such guarantees Performance may also tend to degrade as the uptime and data loss requirements become more demanding The end result of considering the business requirements, performance, and financial considerations is often a compromise It is vitally important that this be documented, usually in the form of a service level agreement that details exactly what is being done, and what the effects will be of various types of failure For you as the DBA, there is no such thing as good or bad database administration in this environment; there is only whether the procedures you are following confirm to the service level agreement, or not This protects the DBA from criticism (you can t be fired for doing what it has been agreed that you will do) and guarantees the end users the level of service that they have agreed they require The three areas of a service level agreement relevant to backup and recovery are the mean time between failures (the MTBF), the mean time to recover (the MTTR), and loss of data Your objective as DBA is to increase the MTBF while reducing the MTTR and data loss MTBF refers to how frequently the database becomes unavailable For some organizations, the database must be available all the time Real-time systems, such as satellite flight control or process control in an oil refinery, must run all the time; even a few minutes failure can be catastrophic Oracle provides two advanced options that can contribute to 100 percent availability: RAC and Streams A RAC, or clustered, database consists of one physical database opened by multiple instances on multiple computers If any one computer or instance fails, the database remains open for use through a surviving instance RAC protects against hardware, operating system, and.

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