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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.

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.

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

Figure 1-6. Dynamic coupling is introduced through a direct typed reference. In this example, assume class A uses the typed reference named myReference to call B.Method1. Class A is dynamically coupled to B because the executable code for B.Method1 must be present at run time in order to run A. Note that class A is also statically coupled to B, because A references the type B (through the typed reference myReference). It is possible to eliminate the static coupling by separating the interface of B from the implementation of B, as shown in Figure 1-7.

(3) Standard Processing/Service Requirements. All of the systems/applications listed in paragraph (1) above are required to be operational 98% of the total time listed in paragraph (2) above. The Information Systems Department will provide a method for the Department of Finance to monitor operational percentages. (4) Processing of data will be limited to the functionality/processing that was being conducted at the time of handing over the operations to the Information Services Department. b. ...

Note SLAs also specify the cause of possible service interruptions and the expectations regarding the resumption of normal service. If the disruption of service is not due to a database failure, obviously other factors come into play, such as the network and the servers. You should, however, list the potential reasons for a database failure and the time it will take to recover from each of those failures. The total time taken for any recovery, of course, will include the time taken to restore the lost or damaged files and the time to recover the database. 16 covers the recovery process.