Backup e Restore em Parallel

Chega de medo de DATAFILEs grandes.
O Oracle Database (Enterprise Edition, 11gR1 ou superior) permite também que o BACKUP e RESTORE via RMAN de um único DATAFILE seja executado em vários canais paralelos, o que pode agilizar em muito este tipo de operação, dependendo de suas CPUs e I/O.
No exemplo abaixo, eu permiti PARALLEL 10, mas o RMAN decidiu utilizar apenas 3, devido ao DATAFILE ter apenas cerca de 1GB.

 [oracle@Caspar ~]$ rman TARGET /
 
 Recovery Manager: Release 11.2.0.3.0 - Production on Sat Oct 15 14:41:06 2011
 
 Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
 
 connected to target database: CATALOGO (DBID=2990378892)
 
 RMAN> SHOW ALL;
 
 using target database control file instead of recovery catalog
 RMAN configuration parameters for database with db_unique_name CATALOGO are:
 CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
 CONFIGURE BACKUP OPTIMIZATION OFF; # default
 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 COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
 CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
 CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.2.0.3/db_1/dbs/snapcf_CATALOGO.f'; # default
 
 RMAN> CONFIGURE DEVICE TYPE DISK PARALLELISM 10 BACKUP TYPE TO BACKUPSET;
 
 new RMAN configuration parameters:
 CONFIGURE DEVICE TYPE DISK PARALLELISM 10 BACKUP TYPE TO BACKUPSET;
 new RMAN configuration parameters are successfully stored
 
 RMAN> BACKUP DATAFILE 1;
 
 Starting backup at 15-OCT-11
 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
 using channel ORA_DISK_6
 using channel ORA_DISK_7
 using channel ORA_DISK_8
 using channel ORA_DISK_9
 using channel ORA_DISK_10
 channel ORA_DISK_1: starting full datafile backup set
 channel ORA_DISK_1: specifying datafile(s) in backup set
 input datafile file number=00001 name=/u01/app/oracle/oradata/CATALOGO/system01.dbf
 channel ORA_DISK_1: starting piece 1 at 15-OCT-11
 channel ORA_DISK_2: starting full datafile backup set
 channel ORA_DISK_2: specifying datafile(s) in backup set
 channel ORA_DISK_3: starting full datafile backup set
 channel ORA_DISK_3: specifying datafile(s) in backup set
 including current SPFILE in backup set
 channel ORA_DISK_3: starting piece 1 at 15-OCT-11
 channel ORA_DISK_3: finished piece 1 at 15-OCT-11
 piece handle=/u01/app/oracle/FRA/CATALOGO/backupset/2011_10_15/o1_mf_nnsnf_TAG20                                              4246 comment=NONE
 channel ORA_DISK_3: backup set complete, elapsed time: 00:00:01
 including current control file in backup set
 channel ORA_DISK_2: starting piece 1 at 15-OCT-11
 channel ORA_DISK_2: finished piece 1 at 15-OCT-11
 piece handle=/u01/app/oracle/FRA/CATALOGO/backupset/2011_10_15/o1_mf_ncnnf_TAG20                                              4246 comment=NONE
 channel ORA_DISK_2: backup set complete, elapsed time: 00:00:08
 channel ORA_DISK_1: finished piece 1 at 15-OCT-11
 piece handle=/u01/app/oracle/FRA/CATALOGO/backupset/2011_10_15/o1_mf_nnndf_TAG20                                              4246 comment=NONE
 channel ORA_DISK_1: backup set complete, elapsed time: 00:00:31
 Finished backup at 15-OCT-11
 
 RMAN>

Ricardo Portilho Proni

Com 20 anos de experiência profissional, Oracle ACE Member – eleito pela Oracle Corporation um dos maiores especialistas do mundo em Oracle Database- Trabalhou em grande parte dos maiores bancos de dados Oracle do Brasil. Certificado em Oracle, SQL Server, DB2, MySQL, Sybase e Websphere.

Conselheiro do GPO e do GUOB, palestrante do ENPO, GUOB Tech Day e Oracle Open World, escritor da Revista SQL Magazine e Instrutor na Nerv.