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The ideal way to maintain a redundancy set is to use the flash recovery area, as described in the section The Flash Recovery Area later in this chapter. This way, you can maintain the redundancy set in one location on disk and automatically manage this space. Your recovery time will be reduced, as all the necessary backups that are part of your redundancy set are maintained on the disk itself.

Using backed-up copies of data files and control files to replace lost or damaged data files and control files is called restoring. Bringing the data files up to date using backed-up data files and archived redo log files is called recovery.

You can take it for granted that there will be some kind of storage media related problems over time. You need to have a strategy so you can be ready for this eventuality. Your backup strategy will depend heavily on the type of SLA you have in place, the size of your databases, the amount of changes made to your data, the disk space available, and other factors.

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There are two steps in an Oracle media recovery process: First you restore a backup of the data files and the control file and make them available to Oracle. Then comes the recovery, when you bring the data files up to date by applying the archived redo log files and the online redo log files. The recovery process, itself, has two steps: Cache recovery (rolling forward): The redo log contains both committed and uncommitted changes. As you know, Oracle writes to the redo log first and the data files later. When you restore older files from backups to replace lost or damaged data files, those files are missing all the changes made since the time of the backup. The process of applying the contents of both the archived and redo log files to bring the data files up to date is called cache recovery or rolling forward. Once you complete cache recovery, you will have gained all your committed changes, but unfortunately, you ll also have all the uncommitted changes that are part of the redo log.

It is common for most IT departments today to draw up formal SLAs with their clients. SLAs are ways to formalize expectations regarding the availability and performance of the database, as well as other components such as the network. SLAs usually include factors such as the following: Maintenance windows Upgrade schedules Backup and recovery procedures Response times for certain key database operations Database and server downtime parameters SLAs specify the uptime for the databases in clear terms. They also specify maintenance windows and the planned recovery time under several identifiable downtimes (for example, downtime due to a disk failure). The concept of uptime is pretty tricky with a 99 percent uptime, you are still down almost four entire days during the year. Whether your organization can handle this or would like a 99.999 percent uptime, which implies only five minutes of downtime, is something you need to nail down in clear terms. A typical SLA for database operations may look like the following (a partial agreement is shown here): Standard Processing Services. The Provider shall furnish and allow access to the processing environments listed below: a. Mid-tier processing. (1) Applications to be processed: Financial Information Systems (FIS) to include: LIST OF FIS APPLICATIONS Other Departmental Applications (2) Hours of Availability. Interactive: Monday-Friday* 07:00-17:00* Saturday, Sunday and Holidays Not Applicable *Application will be a web-based 24 7 365 system WITH the exception of the scheduled maintenance periods (see below) Batch: Not applicable Maintenance: Monthly, Fourth Weekend of Every Month

Transaction recovery (rolling back): During the application of the redo log data to the data files, both committed and uncommitted changes get applied. The uncommitted changes must now be removed from the data files. Oracle uses the pre-change versions of data stored in the undo segments to remove these uncommitted changes. This second step is called transaction recovery or rolling back. Oracle gets the undo data through cache recovery, which regenerates the undo segments from the redo log.

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