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directly use them to perform a recovery. However, if you have backup sets, you must first extract the backup files using the RESTORE command before you can perform a recovery.

Figure 3-44. The delivery timing of a notification relayer system The advantage of the relayer approach is that it is deterministically stable: C always gets n2 after n1.2, because B is in charge of sending both. Of course, B needs to wait for n1.2 to be delivered to C before sending n2, and can do so by using a synchronous delivery protocol. Unfortunately, demons lurk in the shadows with the relayer approach. Not only does it require ad hoc coding in each component, but there is another problem: If n1.1 and n1.2 are sent in a pull mode to retrieve data from B and C, then A expects the response from n1.1 to contain both B s and C s data. B needs some extra intelligence regarding how to reconcile its own returned data with C s returned data. This extra intelligence is needed only because B is trying to solve a problem created by A (the requirement to use multicasting with n1). Other solutions are possible for avoiding race conditions, but a completely generic solution that is easy to implement doesn t currently exist.

You can use the database backups instead of the actual database files to transport tablespaces. Thus, you don t need to make a running database s datafiles read-only in order to transport tablespaces.

RMAN provides undeniable benefits when compared to the traditional user-managed recovery methods. Here s a summary of what RMAN offers during a database recovery: RMAN selects and applies the necessary data and log files during recovery. RMAN selects the most recent backup sets and image copies to recover with. RMAN can perform recovery at the data block level with the block media recovery feature (an option not otherwise available), which dramatically reduces recovery time. RMAN provides restore optimization, a great time-saving feature that enables you to bypass datafiles that are okay during the recovery process. RMAN can check the files that need to be restored and avoid recovering bad files. RMAN allows you to recover by applying incrementally updated backups, which drastically reduces recovery time. RMAN provides the DUPLICATE command, which lets you easily create clones of your production database. RMAN restores datafiles from backups and applies the necessary archived redo logs to bring the database up to date. RMAN knows, by looking into its recovery catalog, which files it needs. You thus avoid the extremely labor-intensive and error-prone manual intervention in a typical user-managed recovery.

When notifications cross process, machine, or network boundaries, you sometimes need to be extra careful with their ordering. Consider a system consisting of three concurrent processes, P1, P2, and P2, as shown in Figure 3-45.

The recovery catalog, as you learned in 15, provides so many benefits that you should plan on using it if RMAN is a part of your backup and recovery strategy.

One of the biggest advantages to using RMAN is that you can check whether your backups are valid before performing a recovery. The following section explains how to validate backups taken with RMAN.

When you use RMAN to perform backup and recovery tasks, it s easy to verify that a certain backup not only exists, but also is usable. The LIST command shows information about backup sets, proxy copies, and image copies recorded in the RMAN repository. You can use the LIST BACKUP command in RMAN to view information about backup sets, backup pieces, and proxy copies. The LIST COPY command shows information about all datafile copies, archived redo logs, and image copies of archived redo logs. The LIST BACKUP SUMMARY command shows a summary of all RMAN backups. The LIST commands show usable and unusable backups, backups that can and can t be restored, and expired and unavailable backups. You must use the RECOVERABLE option with the LIST command, to list only those backups that can be used for recovery.