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With byte-oriented delivery mechanisms that require the payload to be serialized, such as remote procedure calls, objects must be broken down into a stream of bytes on one end and rebuilt on the other The delivery mechanism often imposes constraints on the size of the payload For example, if notifications are delivered by writing data to a shared memory area, the payload must fit in the available space If it doesn t, the payload might have to be compressed or broken down into a series of smaller pieces sent separately Probably the most limiting constraint of all is throughput You can t send information faster than the delivery channel can handle it Large EBSs often use messaging middleware to manage and distribute the notifications sent between major subsystems Such middleware uses network connections to send and receive notifications as messages.

RMAN> RUN { shutdown immediate; startup mount; restore database; recover database; alter database open; } RMAN> As you can see, RMAN makes the recovery of a database a breeze. You don t have to specify the location of any of the files that you need to restore. RMAN knows where to get the files from by looking in the recovery catalog (or the control file).

In the previous example, I showed how you first had to restore the datafiles before recovering the database. By default, when you use the RESTORE command, RMAN restores a datafile from an image backup or from a backup set if an image copy isn t available. Either way, you have to wait for RMAN to copy the file to its original location. However, you don t have to copy the file to the original location. When you need to perform a fast recovery, you can save the time it takes to restore the datafiles by using the image copies directly. You use the special SWITCH command to let Oracle know that you are actually using the image copy for the lost datafile. You can thus skip the restore step and directly head to the recovery stage. The SWITCH command makes the control file point to the copy of the datafile as the current datafile. This is the same as using the SQL statement ALTER DATABASE RENAME FILE. Note that the filename at the operating system level remains unchanged. Here s how you use the SWITCH command: RMAN> SWITCH DATABASE TO COPY; The preceding command will perform a hot restore of your database.

The network bandwidth is one bottleneck, but the messaging middleware itself also has its own limits on how fast it can handle, filter, and distribute incoming messages Delivery latency is another constraint If the communication channel involves a satellite link, the latency might be hundreds of milliseconds Even if the bandwidth is high, the round-trip time might be a serious problem The round-trip time is the time it takes a message and its response to travel back and forth through a communication channel Delivery mechanisms that rely on acknowledgments for each packet sent may be highly sensitive to the round-trip time A system that runs fine during testing on a local area network might be completely unacceptable in the final production environment if it runs using a satellite link or in a wide-area network..

Use the SWITCH DATABASE rather than the RESTORE DATABASE command if your goal is to restore as quickly as possible.

The user-managed complete database recovery process starts with the restoration of all lost or damaged datafiles from the backup. You then recover the database by using the RECOVER DATABASE command. Oracle will ask for the necessary archived log files and perform the recovery by applying them. It s easier to let Oracle apply the relevant archived log file than to attempt to do it yourself manually. You can automate the application of the archived redo log files in two ways. Before you use the RECOVER DATABASE command, you can use the SET AUTORECOVERY ON command. The other way is to specify the AUTOMATIC keyword in the RECOVER command, as in RECOVER DATABASE AUTOMATIC. The following is a summary of steps required for a complete recovery of your database: 1. Restore the datafiles from backup. 2. Start up the database in the mount mode: SQL> STARTUP MOUNT;