Very first step in configuring RMAN for a Backup

DB version:10gR2
I am a DBA supporting applications development and i am not familiar with RMAN. This weekend we are going to Patch 10.2.0.1.0 to 10.2.0.3.0. Before that i am going to take a backup of the entire Database containing around 57 schemas(total of around 600gb).
We don't have Tape drives. I am going to backup this up on three filesystems in the same machine. This instance is not running on ASM. What is the first step i should be doing in configuring RMAN for a backup?
Edited by: user10583227 on Jan 27, 2009 4:50 AM

Be careful, three filesystems doesn't necessarily mean the use of three channels. Could be more...could be less.
Are you in a position to shutdown the database? If not, you'll also want to backup the archivelogs with BACKUP DATABASE PLUS ARCHIVELOG. You may also consider creating a Guaranteed Restore Point which would allow you to rollback your database in minutes if the upgrade fails.

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See "Using RMAN to Back Up and Restore Files" in "Data Guard Concepts and Administration 10g Release 2 (10.2) B14239-05"
http://docs.oracle.com/cd/B19306_01/server.102/b14239/rman.htm
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http://alexzeng.wordpress.com/2008/09/13/how-to-use-standby-backup-to-restore-primary-db/
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Here we have a dataguard environment with db1(db_unique_name) as primary and db2(db_unique_name) as physical standby database. For both primary and secondary the ORACLE_SID is 'oracledb'.We configured dataguard in 10g environments and we are not using grid control. And now we want to configure rman for incremental backups. We are using a third catalog database to which we registered from primary db successfully. During primary rman configuration it is showing conflicts. Even the changes made in primary RMAN configuration are applied on to the standby too which i think shouldn't happen in this scenario. How to resolve this issue? Is this happening because of the same ORACLE_SID for both primary and secondary? I'm attaching the link of the doc that we followed also the errors and configuration in rman. Can anyone help?
http://docs.oracle.com/cd/B28359_01/server.111/b28294/rman.htm#BAJFBBBB
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN-01007: at line 1 column 11 file: standard input
RMAN> show all;
starting full resync of recovery catalog
full resync complete
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CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY;
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/10.2.0/db_1/dbs/snapcf_NIOS.f'; # default
Thanks.

RMAN> show db_unique_name;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
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RMAN-01007: at line 1 column 7 file: standard input
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found ";": expecting one of: "allocate, alter, backup, beginline, blockrecover, catalog, change, connect, copy, convert, create, crosscheck, configure, duplicate, debug, delete, drop, exit, endinline, flashback, host, {, library, list, mount, open, print, quit, recover, register, release, replace, report, renormalize, reset, restore, resync, rman, run, rpctest, set, setlimit, sql, switch, spool, startup, shutdown, send, show, test, transport, upgrade, unregister, validate"
RMAN-01007: at line 1 column 21 file: standard input
But on this i'm getting response
SQL> select db_unique_name from v$database;
DB_UNIQUE_NAME
db1
same and db2 as db_unique_name for standby....
Edited by: 954758 on Sep 3, 2012 3:41 AM

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Very first step in configuring RMAN for a Backup

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