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The preceding login examples connect directly to the target database without a recovery catalog. Once you configure the optional recovery catalog, you have the option of connecting to the recovery catalog first and performing all your backup/recovery actions through it. This is the option Oracle strongly recommends because of the benefits of using the recovery catalog. In the following, the recovery catalog is in the database nick and the target database is orcl: $ rman target orcl catalog rman/rman@nick Recovery Manager: Release 11.1.0.6.0 - Production on Thu Mar 27 11:09:16 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved.target database Password: connected to target database: ORCL (DBID=1065483535) connected to recovery catalog database RMAN>

By default, RMAN outputs everything to the screen, but you can have it redirect the output to a log file by specifying the parameter LOG when starting RMAN. For example: $ rman LOG /u01/app/oracle/rman.log When you specify the LOG parameter, RMAN doesn t display any output to you. To make RMAN log its output as well as send it to standard output, use the Linux or UNIX tee command, as shown here: $ rman | tee /u01/app/oracle/rman.log

Figure 3-16. A notification delivered using a procedure call The arrow in Figure 3-16 shows the direction of travel of execution control, not the direction of data transferred by the notification. All procedure calls are natively synchronous at the machine level: The caller blocks until the callee returns. If the caller returns when it s completely done, the computing model is synchronous, but if the callee returns immediately after scheduling a background thread to handle the call, the computing model is asynchronous. Synchronous models are much more popular, because they are simpler to deal with: They don t introduce concurrency issues, since the system is only doing one thing at a time. Sometimes you want multiple things to happen at the same time, so you might need to use an asynchronous model. To do so, you must use concurrent code on the caller side, the callee side, or both. When sending notifications with procedure calls, the procedure call itself represents the notification signal. Procedure calls might or might not have parameters. If they do, the arguments represent the notification s payload. The payload also includes data returned from the callee. Although notifications usually push information from the sender to the receiver, they can also pull information.

As you ll see in upcoming sections of this chapter, you can use simple manual RMAN commands, such as BACKUP DATABASE and LIST OBSOLETE. However, manual commands aren t the only or the best way to give directives to RMAN. RMAN comes with a powerful scripting language that lets you encapsulate common backup tasks easily. You can store RMAN scripts either in the recovery catalog or as text files. You can create scripts designed for a single database or global scripts that can be used in several databases. RMAN offers two sorts of scripts: stored scripts (kept in the RMAN recovery catalog) and text scripts (kept in regular text files). Stored scripts have the advantage that any user who logs into RMAN can access them easily. You can use stored scripts as alternatives to command files for any set of RMAN commands that you regularly execute. Unlike command files, which are stored on the file system, stored scripts are stored in the recovery catalog. When you need to use a large number of configuration parameters for a particular backup, it s much easier to use a script. RMAN scripts thus perform the same function as regular scripts in UNIX or SQL: they make it easier to store and rerun long sets of commands.