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All the BACKUP commands in the preceding sections are full backup commands. You can also perform incremental backups using RMAN, and in fact, this is one of the big advantages of using RMAN. Incremental backups are much faster than backing up the entire database. Incremental backups will back up only those data blocks that changed since a previous backup. Incremental backups can be either level 0 or level 1. A level 0 incremental backup copies all data blocks just like a full backup, and acts as the base for subsequent incremental backups. To perform a level 1 incremental backup, you must first have a base level 0 backup. RMAN provides two types of incremental backups: Differential backup: Backs up all blocks changed after the most recent incremental backup at level 1 or 0. Cumulative backup: Backs up all blocks changed after the most recent incremental backup at level 0. The following command gets a level 0 backup to start with: RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE; Once you have the level 0 backup, you perform a level 1 differential incremental backup: RMAN> BACKUP INCREMENTAL LEVEL 1 DATABASE; A cumulative incremental backup at level n will perform a backup of all changed blocks since the last backup at level n 1 or lower. So, if you perform the cumulative incremental backup at level 2,

it will back up all data blocks changed since level 0 or level 1. Although you can perform a level 2 incremental backup, according to Oracle, only level 0 and level 1 are permitted. The size of your incremental backup file will depend on the number of changed blocks and the incremental level. Cumulative backups will, in general, be larger than differential backups, since they duplicate the data copied by backups at the same level. However, cumulative backups have the advantage that they reduce recovery time, because you apply only one backup. Thus, Oracle recommends using cumulative backups, if space isn t a problem on your server. Here s an example that shows how you can use a combination of incremental backups to come up with your backup strategy: On Sunday, perform an incremental level 0 backup. On Monday through Saturday, perform differential incremental level 1 backups. Repeat the cycle next week. In this strategy, if you need to recover data on Thursday evening, you apply the incremental backups from Monday, Tuesday, and Wednesday to Sunday s level 0 backup. Consider an alternative strategy using cumulative backups: On Sunday, perform an incremental level 0 backup. On Monday through Saturday, perform cumulative incremental level 1 backups. Repeat the cycle next week. Note that in this case, the daily cumulative level 1 backup backs up all blocks changed since the Sunday backup. Thus, if you need to recover your database on Thursday, you need to apply only one cumulative backup from the night before to Sunday s incremental level 0 backup.

You can t use the ALLOCATE CHANNEL and SWITCH commands as stand-alone commands. You must use them with the RUN command, as follows: RMAN> RUN {ALLOCATE CHANNEL c1 DEVICE TYPE PARMS='ENV=(NSR_GROUP=default)'; BACKUP DATAFILE 1; } allocated channel: c1 channel c1: sid=11 devtype=SBT_TAPE channel c1: MMS Version 2.2.0.1 sbt

With indirect-delivery architectures, publishers send notifications to a middleware system, which then takes responsibility for notifying subscribers The middleware components serve as decouplers, because publishers and subscribers no longer talk to each other directly In the literature, middleware components go under a variety of names, including notification services, event services, messaging services, message-oriented middleware (MOM), and others Middleware components offer a host of services to event publishers, such as reliable delivery, various types of QoS, complex subscription filters, and support for mobile subscribers This last feature has become of great interest, with the rise in popularity of wireless systems Rendezvous-Notify20 is an example of system-supporting mobile subscribers In indirect-delivery architectures, notification delivery is almost always asynchronous Notifications are generally textual in nature, so they often are called messages Messages may contain human-readable text, XML data representing the serialized data of complex objects, or other.

The SWITCH command is similar to the ALTER DATABASE RENAME DATAFILE command. It lets you replace a datafile with file copy made by RMAN.