Backup and Recovery

Protects From Data Loss

Backup and Recovery

Protects From Data Loss

Provides for Media Recovery

Backup and Recovery

Protects From Data Loss

Provides for Media Recovery

Backup TypesPhysical

Logical

Backup and Recovery

Protects From Data Loss

Provides for Media Recovery

Backup TypesPhysical

Logical

Types of BackupsRecovery Manager (RMAN)

User-Managed (including third party utility)

Backup Strategy

ComprehensiveRMAN• Database files, including datafiles, control

files, and the server parameter file (SPFILE)• Archived redo logs

OS• Network configuration files (listener.ora, tnsnames.ora, et cetera)

• Password files• External tables• Oracle home

RMAN BACKUP Command

Basic BACKUP Commands:BACKUP DATABASE

BACKUP CURRENT CONTROLFILE

BACKUP SPFILE

BACKUP ARCHIVELOG ALL

RMAN Default Configuration

Backup Location OS Dependent

Backup Type Disk

Backup Channels One

MAXSETSIZEUnlimited

Backup Example$ rmanRecovery Manager: Release 10.2.0.3.0 - Production on Thu Jun 15 10:28:59 2006

Copyright (c) 1982, 2005, Oracle. All rights reserved.

RMAN> connect target tsb@mylreptarget database Password: connected to target database: MYLREP (DBID=518368273)

RMAN> backup database;Starting backup at 12-JUN-08.Output from backup is printed here.Finished backup at 12-JUN-08RMAN> exit

BACKUPSET vs. COPIES

BACKUP SET

Consists of BACKUP PIECES• Proprietary Format• Backup "USED" blocks

Only RMAN can be used to restore/recover

BACKUPSET vs. COPIES

BACKUP SET

Consists of BACKUP PIECES• Proprietary Format• Backup "USED" blocks

Only RMAN can be used to restore/recover

COPIES

Identical to OS copies.

Can be used as replacement to datafile.

Can be used in user-controlled recover/restores.

Block Change Tracking

Used for Incremental Backups

Traditional incremental backup read entire datafile.

Enabled Block Change TrackingCreates Change Tracking File (CTF)

Use CTF to determine blocks to backup

Consider Environment

Enabling and Disabling Change Tracking

Current State:SQL> SELECT * FROM V$BLOCK_CHANGE_TRACKING;

Enabling/Disabling:SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING;

SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE '/oracle/bu/rman_change_track.f' REUSE;

SQL> ALTER DATABASE DISABLE BLOCK CHANGE TRACKING;

RMAN> list backup;List of Backup Sets===================

BS Key Type LV Size Device Type Elapsed Time Completion Time------- ---- -- ---------- ----------- ------------ ---------------1 Full 1.80G DISK 00:02:49 12-JUN-08 BP Key: 1 Status: AVAILABLE Compressed: NO Tag:

TAG20080612T102922 Piece Name: /opt/oracle/product/10g/dbs/01jio142_1_1 List of Datafiles in backup set 1 File LV Type Ckp SCN Ckp Time Name ---- -- ---- ---------- --------- ---- 1 Full 23722948433 12-JUN-08

/oracle/mylrep/sxfbf35/ora/system01.dbf 11 Full 23722948433 12-JUN-08

/oracle/mylrep/sxfbf35/ora/mgmt_ecm_depot1.dbf

BS Key Type LV Size Device Type Elapsed Time Completion Time------- ---- -- ---------- ----------- ------------ ---------------2 Full 6.92M DISK 00:00:01 12-JUN-08 BP Key: 2 Status: AVAILABLE Compressed: NO Tag:

TAG20080612T102922 Piece Name: /opt/oracle/product/10g/dbs/02jio19j_1_1 Control File Included: Ckp SCN: 23722948667 Ckp time: 12-JUN-08 SPFILE Included: Modification time: 11-JUN-08

LIST COMMANDS

LIST BACKUP;

LIST BACKUPSET;

LIST COPY;

LIST EXPIRED BACKUP;

CROSSCHECK and DELETE

RMAN> CROSSCHECK BACKUP;

RMAN> DELETE EXPIRED BACKUP;

REPORT

REPORT NEED BACKUP;

REPORT OBSOLETE;

REPORT SCHEMA;

REPORT UNRECOVERABLE;