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12c Database : RMAN Enhancements : Multisection backups for image copy backup

	[oracle@Geek DBA12c admin]$ rman target /

	Recovery Manager: Release 12.1.0.1.0 - Production on Fri Sep 13 21:15:43 2013

	Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.

	connected to target database: DB12C (DBID=1279089071)

	RMAN> CONFIGURE DEVICE TYPE DISK PARALLELISM 5;

	using target database control file instead of recovery catalog
	new RMAN configuration parameters:
	CONFIGURE DEVICE TYPE DISK PARALLELISM 5 BACKUP TYPE TO BACKUPSET;
	new RMAN configuration parameters are successfully stored

	RMAN> backup as copy  section size 100M datafile 3 format '/home/oracle/backup_copy_sysaux_%U';

	Starting backup at 13-SEP-13
	using channel ORA_DISK_1
	using channel ORA_DISK_2
	using channel ORA_DISK_3
	using channel ORA_DISK_4
	using channel ORA_DISK_5
	channel ORA_DISK_1: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 1 through 12800
	channel ORA_DISK_2: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 12801 through 25600
	channel ORA_DISK_3: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 25601 through 38400
	channel ORA_DISK_4: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 38401 through 51200
	channel ORA_DISK_5: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 51201 through 64000
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:26
	channel ORA_DISK_1: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 64001 through 76800
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:26
	channel ORA_DISK_2: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 76801 through 89600
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_3: datafile copy complete, elapsed time: 00:00:26
	channel ORA_DISK_3: starting datafile copy
	input datafile file number=00003 name=/u01/app/oracle/oradata/DB12c/sysaux01.dbf
	backing up blocks 89601 through 90880
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_4: datafile copy complete, elapsed time: 00:00:26
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_5: datafile copy complete, elapsed time: 00:00:26
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_3: datafile copy complete, elapsed time: 00:00:03

	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:16
	output file name=/home/oracle/backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d tag=TAG20130913T212045
	channel ORA_DISK_2: datafile copy complete, elapsed time: 00:00:16
	Finished backup at 13-SEP-13

	Starting Control File and SPFILE Autobackup at 13-SEP-13
	piece handle=/u01/app/oracle/fast_recovery_area/DB12C/autobackup/2013_09_13/o1_mf_s_826060887_936f3zh5_.bkp comment=NONE
	Finished Control File and SPFILE Autobackup at 13-SEP-13

At OS or in DISK the file is only one,

	[oracle@Geek DBA12c ~]$ ls -ltr
	-rw-r-----. 1 oracle oinstall 744497152 Sep 13 21:21 backup_copy_sysaux_data_D-DB12C_I-1279089071_TS-SYSAUX_FNO-3_0iojpc1d
	[oracle@Geek DBA12c ~]$

-Thanks

Geek DBA

With multisection copies the backup will be faster than earlier

Prior to 12c, If you are taking a backup of database or datafile for image copy, the file will be copied as is, and backup cannot split into multiple pieces.

According to documentation, you can now create the image copy backup of database or datafile into multiple sections backups. This will provide us the benefit to scatter the backup across and also leverage the parallelism option to backup the database/datafile faster.

Let’s see how this works,

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