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There is no one size fits all type backup strategy that works for all organizations. Plan on using the flash recovery area, described in the next section, as it will eliminate the need to restore from tape in many cases, saving you valuable time. You also don t need to manually remove the obsolete backup files. Planning an efficient backup strategy will mean two important things: You have all required backup files preferably on disk for a quick restoration and recovery. You minimize the space requirements by deleting obsolete backups and keeping only the required backup files on hand. If you expect few changes in data, you are better off using incremental backups, since they won t consume a lot of space. Incremental backups, as part of your backup strategy, will reduce the time required to apply redo during recovery. However, if most of your database blocks change frequently, your incremental backups will be quite large. In such a case, you are better off making a complete image copy of the database at regular intervals. Your frequency of backups and whether and how you should use incremental backups depends on the acceptable mean time to recover (MTTR). For example, you can implement a three-level backup scheme where you take a full or level 0 monthly backup, a weekly cumulative level 1 backup, and a daily differential level 1 backup. (See the Incremental Backups section in the discussion of RMAN commands later in this chapter for a description of these levels and cumulative and differential backups.) Using this strategy, you most likely can completely recover your database without needing to apply more than a day s worth of redo logs.

As we saw for range partitioning, if we try to insert a value that isn t specified in the list partition, Oracle will raise an appropriate error back to the client application In other words, a list partitioned table without a DEFAULT partition will implicitly impose a constraint much like a check constraint on the table: ops$tkyte@ORA11GR2> insert into list_example values ( 'VA', 'data' ); insert into list_example values ( 'VA', 'data' ) * ERROR at line 1: ORA-14400: inserted partition key does not map to any partition If we want to segregate these seven states into their separate partitions, as we have, but have all remaining state codes (or, in fact, any other row that happens to be inserted that doesn t have one of these seven codes) go into a third partition, then we can use the VALUES ( DEFAULT ) clause.

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You could use the incrementally updated backups feature to minimize the MTTR. If on a daily basis, you run the script that appears in the Incrementally Updated Backups section later in this chapter, in essence, you can perform any PITR within 24 hours.

Composite partitioning is useful when you have something logical by which you can range partition, but the resulting range partitions are still too large to manage effectively. You can apply the range partitioning and then further divide each range by a hash function or use lists to partition. This will allow you to spread out I/O requests across many disks in any given large partition. Additionally, you may achieve partition elimination at three levels now. If you query on the range partition key, Oracle is able to eliminate any range partitions that do not meet your criteria. If you add the hash or list key to your query, Oracle can eliminate the other hash or list partitions within that range. If you just query on the hash or list key (not using the range partition key), Oracle will query only those hash or list subpartitions that apply from each range partition. It is recommended that, if there is something by which it makes sense to range partition your data, you should use that over hash or list partitioning. Hash and list partitioning add many of the salient benefits of partitioning, but they are not as useful as range partitioning when it comes to partition elimination. Using hash or list partitions within range partitions is advisable when the resulting range partitions are too large to manage, or when you want to use all PDML capabilities or parallel index scanning against a single range partition.

In this example, you size the flash recovery area so it holds three days worth of incremental backups In this and the next example, assume that the retention policy is REDUNDANCY 1; that is, you keep only one set of backups on hand Use the following commands to make your incremental backups As explained later in this chapter, the RECOVER COPY command will produce a level 0 whole database backup Use the following script to save archived logs and incremental backups created after SYSDATE-3: RECOVER COPY OF DATABASE TAG "whole_db_copy" UNTIL TIME 'SYSDATE-3'; BACKUP INCREMENTAL LEVEL 1 FOR RECOVER OF COPY WITH TAG "whole_db_copy" DATABASE; Let s say you start running the script on Sunday, July 20, 2008 You decide that you want to keep only three days worth of backups in the flash recovery area, including datafiles and archived redo logs.

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