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The transmission latency of a connection is related to two key parameters: the amount of traffic in the system and the system s bandwidth When using complex connection infrastructures which networks are the transmission latency can be totally unpredictable Anyone who has surfed the Web knows that some pages can take a much longer time to download than others As traffic piles up at hot spots in the network, delays occur while the networking infrastructure struggles to process the backlog of messages over a system with finite bandwidth When the sender and receiver are in different computers in different places, the sender might not know whether the receiver is online Even if the receiver is online, it might be too busy to accept incoming data, or the data might arrive faster than the receiver can handle it For these situations, middleware components like message queues can be helpful.

This is because the control file allocates a finite space for backup-related activities, while the recovery catalog has more room for storing backup history One recovery catalog in your system can perform backup, restore, and recovery activities for dozens of Oracle databases Thus, you can centralize and automate backup and recovery operations by using the recovery catalog Oracle recommends that you use a dedicated database for running the recovery catalog, but it isn t absolutely necessary..

Note You re strongly advised to use the recovery catalog so you can take advantage of the full range of features provided by RMAN. The discussion of RMAN s features in this chapter and the next assumes the existence of the recovery catalog.

You can make backups directly to your operating system disks using RMAN. If you want to make backups to tape, you ll need additional software called an MML or a media manager. RMAN can move backups on disk to tape and restore the tape backups if necessary. Oracle Database 11g contains a proprietary media management product, called Oracle Secure Backup, which I discuss in the Oracle Secure Backup section later in this chapter.

Regardless of the physical details of the connection medium, all serialized connections conceptually transfer data the same way, as shown in Figure 3-15 The marshaling/unmarshaling processes transfer objects from one address space into another When the transfer entails the use of a serialized connection, the marshaling process also serializes the object, while the unmarshaler deserializes them on the other end Omitted from the previous figures are software layers related to networking From this point of view, the networking software is transparent Of course, you need to consider certain aspects of the underlying protocol when designing a notification system For example, TCP uses a built-in mechanism for resending messages that become garbled in the transmission, while UDP uses no such mechanism..

You can connect to RMAN by simply typing rman at the operating system prompt. (Make sure you ve set the path variables correctly; in some operating systems, such as SUSE Linux, you may get the operating system s utility, named rman, instead of Oracle s RMAN utility.) This will get you the RMAN> prompt, at which point you can type in the various commands. You can also use the RMAN commands in batch mode or through pipes by using Oracle s DBMS_PIPE package. You don t need to be a SYSDBA privilege holder to just connect to the RMAN catalog; you can do so with the special rman account and password. As you ll see later in the Creating the Recovery Catalog section, the user rman is the owner of the catalog. You can connect to RMAN through database password authentication. You can also connect to the database using operating system authentication. The following sections describe each of these methods.

You can log into the RMAN utility using your database credentials. You issue backup/recovery commands after connecting to the target database. To finish your RMAN session, use the exit command. Here is an example of connecting to the database named orcl, which is the target database: $ rman 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. RMAN> CONNECT TARGET / connected to target database: ORCL (DBID=1080111806) RMAN> exit Recovery Manager complete. $