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You can create operating system command files for regularly scheduled RMAN backup jobs. Inside a command file, you can use the @filename syntax to specify a command file that you want RMAN to execute. For example, you can create a command file named testfile1 with the following RMAN command: BACKUP DATABASE PLUS ARCHIVELOG; You can then run the command file testfile1 from the operating system command line as follows: $ rman target / @testfile1 Note that you can also specify the @filename syntax at the RMAN prompt to execute a command file, as shown here: RMAN> @testfile1 You can also specify the USING clause at the command-line prompt to specify values for use in substitution variables in a command file, thus making a command file dynamic. I provide a simple example that shows how to create and execute a dynamic shell script. The script calls a command file that contains the substitution variables.
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1. Create a command file (monthly_backup.cmd) that uses substitution variables, as shown here: #monthly_backup.cmd CONNECT TARGET / RUN { ALLOCATE CHANNEL c1 DEVICE TYPE sbt PARMS 'ENV=(OB_MEDIA_FAMILY=&1)'; BACKUP DATABASE TAG &2 FORMAT '/u02/app/oracle/bck/&1%U.bck' RESTORE POINT &3; } EXIT; The command file monthly_backup.cmd uses three substitution variables to name the tape set, to provide the FORMAT string specification, and to name the restore point. 2. Next, create a shell script you ll use to run the monthly_backup.cmd file. The shell script mybackup.sh contains three shell variables, and you can pass the values for those variables at the command line when you execute the script. #!/bin/tcsh # name: mybackup.sh # usage: use the tag name and number of copies as arguments set media_family = $argv[1] set format = $argv[2]set restore_point = $argv[3] rman @'/u01/app/oracle/scripts/monthly_backup.cmd' USING $media_family $format $restore_point Now you have a shell script (mybackup.sh) that you can execute by passing arguments at the command line to specify values for our three substitution variables. 3. Execute the mybackup.sh shell script, as shown here: % mybackup.sh archival_backup bck0906 FY06Q3 Each time you run the mybackup.sh script, you can specify different values for the three substitution variables, right at the command line.
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All stored scripts in RMAN are created with the CREATE SCRIPT command, followed by the actual script contents enclosed within a pair of curly brackets, { }. You can use any commands within the brackets of a CREATE SCRIPT command that you can use in a RUN block. The RMAN scripts do look a bit cryptic at first, but they are highly effective and actually easy to write. Here s a simplified nightly backup script that performs a full database backup. Note that by using the keyword SQL, you can include regular SQL commands within your RMAN backup script. RMAN> CREATE SCRIPT nightly_backup { 2> ALLOCATE CHANNEL c1 TYPE DISK; 3> BACKUP DATABASE FORMAT '/u01/app/oracle/%u'; 4> SQL 'ALTER DATABASE BACKUP CONTROLFILE TO TRACE'; 5> } created script nightly_backup RMAN>
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You execute a script with the RUN command and the EXECUTE SCRIPT command. So, now that you have created the script nightly_backup, all you need to do to run the full backup is to execute the script as follows: RMAN> RUN {EXECUTE SCRIPT nightly_backup;} executing script: nightly_backup allocated channel: c1 channel c1: sid=19 devtype=DISK . . . RMAN> RMAN scripting enables you to perform complex tasks in a few short lines. The following script uses two tape devices to perform a full database backup. The script allocates the two channels (connections to the server), completes the backup in a specified format, and releases the channels. RMAN> 2> 3> 4> 5> 6> 7> 8> 9> 10> RUN { ALLOCATE CHANNEL c1 TYPE 'sbt_tape'; ALLOCATE CHANNEL c2 TYPE 'sbt_tape'; BACKUP FORMAT 'full d%d_u%u' FILESPERSET 10 DATABASE; RELEASE CHANNEL c1; RELEASE CHANNEL c2; }
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If you wish, you can incorporate RMAN commands in an operating system file, called a command file. Here is an example that shows how you can use an operating system file to execute RMAN commands and store the results in a log file (output.txt): $ rman TARGET/CATALOG rman/cat@catdb CMDFILE commandfile.rcv LOG outfile.txt
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