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Syntax Diagrams: This reference uses syntax diagrams to show Recovery Manager commands. These syntax diagrams use lines and arrows to show syntactic structure, as shown in the following example for the RMAN CATALOG command. Keywords Keywords have special meanings in Recovery Manager syntax. In the syntax diagrams, keywords appear in rectangular boxes and an uppercase font, like the word CATALOG in the example diagram. When used in text and code examples, RMAN keywords appear in uppercase, monospace font, for example, CATALOG DATAFILECOPY. You must use keywords in RMAN statements exactly as they appear
in the syntax diagram, except that they can be either uppercase or lowercase. Manually allocated channels (allocated by using ALLOCATE) should be distinguished from automatically allocated channels (specified by using CONFIGURE). Manually allocated channels apply only to the RUN job in which you issue the command. Automatic channels apply to any RMAN job in which you do not manually allocate channels. You can always override automatic channel configurations by manually allocating channels within a RUN command. Spreading a Backup Across Multiple Disks: Example When backing up to disk, you can spread the backup across several disk drives. Allocate one DEVICE TYPE DISK channel for each disk drive and specify the format string so that the filenames are on different disks. Backup Sets, Backup Pieces, Image Copies, and Proxy Copies When the AS BACKUPSET option is used, RMAN generates one or more backup sets, which are RMAN-specific logical structures. The backup set is the smallest unit of a backup. By default, each backup set contains 4 or fewer datafiles or 16 or fewer archived logs.
Tags : syntax diagrams, archived logs, syntax diagram, word catalog, rectangular boxes, backup sets, image copies, channel configurations, backup set, logical structures, monospace font, database recovery, oracle database, syntactic structure, datafiles
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