Oracle Recovery Manager - RMAN
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1 Oracle Recovery Manager - RMAN
2 RMAN Incremental Backups Recovery Preview allows you to test recovery process without actually recovering Backup can be stored in ASM Compress backups save disk and network bandwidth Recover past resetlogs!
3 Introduction Session Goal Discuss the merits of Recovery Manager and the importance of backups Session Objectives Discuss the basic anatomy of Recovery Manager Review backup options Learn basic RMAN syntax required for backup and recovery Answer your burning questions about RMAN
4 Agenda Slide Backup Basics and Review Recovery Manager Anatomy Using Enterprise Manager for RMAN Setup Backups with RMAN Backup Reports Questions and Answers
5 Backup Basics and Review
6 Executive Decisions What questions should be posed to your institution while formulating your backup and recovery plan? Can you afford any data loss? What is an acceptable recovery time? What kind of budget has been designated? Are you considering a High Availability (HA) solution? Real Application Clusters Data Guard
7 Translation of Executive Decisions Allocate resources Hardware Software Manpower Time Configure database according to decisions Storage space for backups
8 Oracle Architecture Network User Processes Client Server Processes PGA Database Buffer Cache Redo Log Buffer SGA Instance Java Pool Large Pool Shared Pool Shared SQL & PL/SQL Data Dictionary Cache SMON DBWn CKPT PMON LGWR ARCn Parameter File Database Files Control Files Redo Log Files Password File Database Archived Log Files
9 Oracle Architecture- Files Control Files: record the status of data/physical structure Datafiles: physical storage of data Redo Logs: contain before and after copies of data Archived Redo Logs: copies of redo logs Alert Log: logs major database changes and errors Password File: stores information allowing sysdba connections Parameter File: stores parameters required for instance startup
10 Oracle Architecture- Processes PMON: Performs rollback and releases the resources held by a failed process SMON: performs automatic instance recovery DBWn: writes dirty buffers form the data buffer cache to the data files LGWR: writes data from the redo log buffer to the redo log files CKPT: Synchronizes the headers of the data files and control files with the current redo log and checkpoint numbers ARCHn: copies redo logs that have been marked for archiving
11 To Archive or Not to Archive? NOARCHIVELOG mode Default mode Database must be shutdown to perform backups ARCHIVELOG mode Uses ARCH process May use point-n-time recovery Database may be open while performing backups
12 Turning on Archivelog Mode Set necessary init.ora parameters Log_archive_dest_n Log_archive_dest_state_n Log_archive_format Shutdown the database Mount the database ALTER DATABASE ARCHIVELOG; Open the database
13 NOARCHIVELOG offline backup A database in NOARCHIVELOG mode can achieve full recovery only up to the point of the last complete backup taken with the following steps: 1.Shutdown the database cleanly 2.Make a copy of all datafiles, control files and online redo logs to another location 3.Startup the database
14 ARCHIVELOG offline backup A database in ARCHIVELOG mode can be backed up while the database is open or shut down. In order to take an offline backup use the following steps: 1.Shutdown the database cleanly 2.Make a copy of all datafiles 3.Startup the database 4.Force a log switch for your online redo logs 5.Make a copy of all archived redo logs 6.Create a backup of the control file
15 ARCHIVELOG online backup In order to take an online backup use the following steps: 1.ALTER DATABASE BEGIN BACKUP; 2.Make a copy of all datafiles 3.ALTER DATABASE END BACKUP; 4.Force a log switch for your online redo logs 5.Make a copy of all archived redo logs 6.Create a backup of the control file
16 What happens during an online backup? Datafiles are written to continuously as backup is performed All redo generated during a backup must be available if recovery is needed, hence the log switch Entire blocks of data that are being changed are recorded in the redo, rather than just the change vectors More disk space and CPU resources are utilized during backup mode
17 ARCHIVELOG Recovery In order perform a full database recovery use the following steps: 1.Copy all of the database files from your last backup 2.Copy all necessary archived redo logs 3.Mount the database 4.Recover the database 5.Apply archived redo entry as prompted 6.Open the database
18 What else should I backup? While you could recreate the following, it s a lot less work to restore from a backup: Oracle Home software Network files listener.ora tnsnames.ora Parameter files Password files Oratab file
19 Recovery Manager Anatomy
20 What is RMAN? Short Answer RMAN is an interface for backing up and recovering your database. Long Answer RMAN is a method of server managed recovery, interpreting commands into remote procedure calls to be carried out in the database for the purpose of backup and recovery.
21 Why use RMAN? It s FREE (with your Oracle license) Backups can be checked for corruption before it become a problem Minimize downtime after failure Recover single blocks of data Backup directly to tape Creating duplicate instances, including standbys for failover
22 Why use RMAN?...continued Backups can be taken online without the additional overhead of traditional online backups Automatically includes new datafiles and tablespaces without manual intervention Only backs up used data blocks Allows for compressed backups Works with third-party media management Allows for centralized management and reporting of backups
23 Key RMAN Players $ORACLE_HOME/bin/rman Command interpreter, creating PL/SQL calls to the target Creates system calls to the OS requiring read/write privileges recover.bsq Library file Must be the same version as the executable
24 Supporting Cast Target Database: database that is being backed up Recovery Catalog: additional repository for backup metadata Auxiliary Database: database to be cloned or standby instance to be created
25 Additional plot lines RMAN always connects to the target as sysdba, because it must access objects in the SYS schema Best practice is to run RMAN form the target $ORACLE_HOME If you are not running RMAN from the target $ORACLE_HOME, you will need a password file, sysdba privileges, a tnsnames.ora entry for the target instance RMAN is backward compatible The recommendation for 10g is to run RMAN through the control file, rather than a separate repository It is easy to connect to the wrong database when using the same $ORACLE_HOME
26 Benefits of Using the Control File Already has physical database structure included No need to update when new datafiles/tablespaces are added Possible to use the RMAN utility delivered in the $ORACLE_HOME of the target database May not need password file or sysdba privileges
27 How the Control File Works Control file regularly ages out information as necessary Noncircular Reuse Records include datafile and log file inventory Circular Reuse Records include archived log history and RMAN backups
28 Additional Control File Notes CONTROL_FILE_RECORD_KEEP_TIME=7 (default) is found in the init.ora file RMAN creates a read consistent view of the control file during backups called the snapshot control file Database must be at least in NOMOUNT for RMAN usage
29 Benefits of using a Recovery Catalog You may store scripts for future use or reuse Helpful for a Data Guard HA solution Do not need to use CONTROL_FILE_RECORD_KEEP_TIME in init.ora You will not lose RMAN metadata when rebuilding the control file Creates one spot for maintenance and reporting of backups
30 How a Recovery Catalog Works RMAN connects to designated schema in a database other than the target database RMAN connects to the target database Metadata is extracted from the control file of the target Data is loaded into tables of the schema specified while connecting to the additional instance
31 How to Create a Recovery Catalog Designate another database SYSTEM 90MB TEMP 5MB UNDO 5MB RMAN User 15MB per backed up instance Online Redo 1MB per file Figures are based on one year of metadata collection Create a user specifically for RMAN backups Grant connect, resource, recovery_catalog_owner to the user created above Issue the CREATE CATALOG command
32 Using Enterprise Manager for Backups
33 EM Maintenance Tab
34 Recovery Catalog Settings
35 Register Database with Recovery Catalog
36 Backup Settings
37 Configuration Settings RMAN> show all; RMAN configuration parameters are: CONFIGURE RETENTION POLICY TO REDUNDANCY 2; 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 '/u03/backup/pprd/rman/%f'; 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 CHANNEL DEVICE TYPE DISK FORMAT '/u03/backup/pprd/rman/%u'; CONFIGURE MAXSETSIZE TO UNLIMITED; # default CONFIGURE ENCRYPTION FOR DATABASE OFF; # default CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/ /dbs/snapcf_pprd.f'; # default
38 Backup Settings
39 Default Device Type Determines whether you will be backing up to disk or tape Options are mutually exclusive Default may be overridden with the backup device type parameter Syntax: CONFIGURE DEFAULT DEVICE TYPE TO DISK; CONFIGURE DEFAULT DEVICE TYPE TO SBT;
40 Format Multiple channels may be allocated Various format options available %U: System generated unique filename (default) %F: DBID, day, month, year, sequence %s: backup set %p: backup piece Syntax: CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT /u01/backup/pprd/rman/pprd_%u ;
41 Backup Type Used to further define how backups will be carried out by default device type If compressed backup sets are chosen, backup files will be smaller, but it will take longer to restore from them Syntax: CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO BACKUPSET; CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET; CONFIGURE DEVICE TYPE DISK BACKUP TYPE COPY;
42 Backup Settings
43 Backup Settings
44 Retention Policy Dictates when a backup will be marked as obsolete Backups that do not meet the configured retention policy will NOT be automatically deleted Syntax: CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 2 DAYS; CONFIGURE RETENTION POLICY TO REDUNDANCY 2; CONFIGURE RETENTION POLICY TO NONE; CONFIGURE RETENTION POLICY TO CLEAR;
45 Retention Policy Notes Retention policies remain until changed or control file is rebuilt You can identify backups that fall outside of your retention policy by issuing the REPORT OBSOLETE command The CHANGE BACKUPSET n KEEP command maybe used to bypass retention policies Restrictions for KEEP FOREVER Must be using a recovery catalog May not be using Flash Recovery Area
46 Control File Autobackup This option will backup the control file and the spfile, if one exists When enable, backups will happen under the following conditions: BACKUP or COPY command is issued, not in a RUN block If a RUN block is used, then at the end as long as the last statement is not BACKUP or COPY Syntax: CONFIGURE CONTROLFILE AUTOBACKUP ON; CONFIGURE CONTROLFILE AUTOBACKUP OFF;
47 Schedule a Backup
48 Schedule a Backup
49 Schedule a Backup
50 Schedule a Backup
51 Schedule a Backup SHGE
52 Schedule a Backup
53 Schedule a Backup
54 Backup Reports
55 11g New Features for RMAN You don t have to physically copy backup files to the auxiliary server, thanks to network aware duplication Backups can skip transactions in the undo tablespace that have already been committed Backup control files can now be converted to standby control files for Data Guard usage Large files can be backed up in parallel with multiple channels using multi-section backups Access to portions of a recovery catalog can be restricted with virtual private catalogs RMAN scripts now take variables at run time
56 Summary Backups are one of the most important aspects the DBA role, if for no other reason than this is the database from which your paycheck comes Recovery Manager usage can be as simple or as complex as you need it to be Recovery with RMAN is just as easy as the backup RMAN can be used for more than backups Failovers Duplicate Instances TEST your backups!!
57 Questions & Answers It s your turn ($5 per question)!!
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