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the system architect. If the recipient is in the same network as the sender, the message is delivered directly to the recipient; otherwise, it is sent to a router, which then forwards the message toward the destination network. Once the message reaches the router of the destination network, the message is delivered to the recipient. There may be multiple routers in the delivery path. Multicasting is not supported in point-to-point, because the sender specifies a unique destination client. All notification messages carry a subject property, and subscribers can listen for notifications with a given subject. In PubSub interactions, the rendezvous point is a message queue, which is identified by the message subject. RV messages are delivered to the recipient application using a push model. The recipient registers with the local RV daemon, providing a queue name and a callback method. RV stores incoming messages in queues. There are queues for different kinds of messages, such as timer messages, diagnostic messages, and normal user messages. A subject can also be provided. When a message arrives, it is wrapped in an event object, and the object is placed in the appropriate event queue and subsequently dispatched to the recipient application by calling the registered callback method. When messages arrive faster than they can be processed, they are buffered up in the event queues. The RV daemon uses a separate dispatch thread for each event queue, so events in each queue are processed one at a time, in the order received.

The following sections take you through a few examples of various kinds of backups you can perform using RMAN.

If you want to back up the entire database, you use the BACKUP DATABASE command. RMAN will automatically back up all the datafiles that are part of the database, as shown in Listing 15-3. Listing 15-3. Backing Up a Database Using RMAN RMAN> BACKUP DATABASE; Starting backup at 06-JUN-08 using channel ORA_DISK_1 channel ORA_DISK_1: starting full datafile backupset channel ORA_DISK_1: specifying datafile(s) in backupset input datafile fno=00001 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\SYSTEM01.DBF input datafile fno=00003 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\SYSAUX01.DBF input datafile fno=00005 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\EXAMPLE01.DBF input datafile fno=00002 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\UNDOTBS01.DBF input datafile fno=00004 name=C:\ORALE\PRODUCT\10.1.0\ORADATA\ORCL\USERS01.DBF . . . Starting Control File Autobackup at 06-JUN-08 piece handle=C:\ORACLE\PRODUCT\10.1.0\FLASH_RECOVERY_AREA\ORCL\AUTOBACKUP\2005_06 _06\O1_MF_N_539094997_0PJ8FDBF_.BKP comment=NONE Finished Control File Autobackup at 06-JUN-08 RMAN>

The basis for message filtering in RV is the message subject. Subject-based filtering is only available for PubSub messages. Subjects are specified using a dot notation, such as Shipping.Air. Subjects can define a hierarchical subject space. An example might be the three subjects Shipping, Shipping.Air, and Shipping.Air.Priority. Wildcard subjects are possible, so the subject Shipping.* would indicate all types of Shipping messages. RV doesn t have a centralized notification service, so the burden of filtering must be placed somewhere else. The RV architects opted for the receiving end. When an RV client publishes a message, a subject must be provided. The message is broadcast to all the other RV clients in the system. A multicast message only travels once through the network, regardless of the number of RV clients or subscribers. When an RV daemon receives a message, it checks the subject. If the subject was subscribed to by a client application, the message is grabbed, wrapped in an event object, and saved in an event queue for subsequent dispatching to the recipient application.

You use the BACKUP ARCHIVELOG ALL command to back up all archived logs that you haven t backed up before. You can also use the command BACKUP DATABASE PLUS ARCHIVELOG to back up all datafiles as well as any archived redo log files, as shown in Listing 15-4. Listing 15-4. Backing Up a Database and Archived Logs Using RMAN RMAN> BACKUP DATABASE PLUS ARCHIVELOG; Starting backup at 06-JUN-08 current log archived allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=38 devtype=DISK channel ORA_DISK_1: starting archive log backupset channel ORA_DISK_1: specifying archive log(s) in backup set input archive log thread=1 sequence=4 recid=1 stamp=539702327 . . . 16\O1_MF_ANNNN_TAG20041016T132206_0Q2SPK4S_.BKP comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:05 Finished backup at 06-JUN-08 RMAN>