Oracle Recovery Manager (RMAN) 10g : Reloaded Tammy Bednar Sr. Product Manager Oracle Corporation Session id: 40104

RMAN: Reloaded

Agenda  What is Recovery Manager?  Automatic disk based recovery  Optimized incremental backups  Incrementally updated backups  Just say no to shrinking backup windows  A new twist to transportable tablespaces  Q&A

Recovery Manager: Oracle’s Backup & Recovery Utility  Over 25 Man Years of Engineering Technology provides: – Intimate knowledge of database file formats and recovery procedures – Manages and automates the backup, restore, and recovery process – Creates and maintains backup policies – Catalogs all backup and recovery activities – Operates on-line and in parallel for fast processing – Corrupt block detection during backup and restore and the ability to validate backups – Integrated with Enterprise Manager & 3rd party network backup products Media Management Layer Enterprise Manager & 3 rd Party Tools Network RecoveryManager

New World: Disk Based Data Recovery  Disk economics are close to tape  Disk is better than tape – Random access to any data  We rearchitected our recovery strategy to take advantage of these economics – Random access allows us to backup and recover just the changes to the database  Backup and Recovery goes from hours to minutes 2000 ’ s GB 1980 ’ s MB 1000x increase

Flash Recovery Area  Unified storage location for all recovery files and recovery related activities in an Oracle Database. – Centralized location for control files, online redo logs, archive logs, flashback logs, backups – A flash recovery area can be defined as a directory, file system, or ASM disk group – A single recovery area can be shared by more than one database  Minimize the number of initialization parameters to set when you create a database – Define a database area and flash recovery area location – Oracle creates and manages all files using OMF Database AreaFlash Recovery Area

Flash Recovery Area Space Management Disk limit is reached and a new file needs to be written into the Flash Recovery Area Backup Files to be deleted Archive Logs & Database File Backups Warning Issued to user Space Pressure occurs RMAN updates list of files that may be deleted 1 2 Oracle delete files that are no longer required on disk. Flash Recovery Area

Benefits to Using a Flash Recovery Area  Unifies the storage location of related recovery files  Manages the disk space allocated for recovery files automatically  Simplifies database administrator tasks  Much faster backup  Much faster restore  Much more reliable due to inherent reliability of disks

Change Tracking File  Optimizes incremental backups – Track which blocks have changed since last backup  Integrated change tracking file – Changed blocks are tracked as redo is generated – RMAN backup automatically uses changed block list Change Tracking File Flash Recovery Area

Incremental Backup and Changed Tracking File Benefits  Faster – Reduces the amount of time needed for daily backups – Saves network bandwidth when backing up over a network  Better – Reduce the backup file storage – Enables fast backups of changed blocks  Simpler – Automatically integrates with backup and recovery – zero effort

Incrementally Updated Backups  Eliminates the need to perform a whole database backup.  Reduces the time required for media recovery since the image copy is updated with the latest block changes. RMAN RECOVER COPY OF DATAFILE RMAN incremental backup Initiate Merge Incrementally Updated Backups

Eliminate Shrinking Backup Window Syndrome!  Fully automatic disk based backup and recovery – Set it and Forget it  Nightly incremental backup rolls forward recovery area backup – Changed blocks are tracked in production DB  Full scan is never needed – Dramatically faster (20x) – Blocks validated to prevent corruption of backup copy  Use low cost ATA disk array for recovery area Two Independent Disk Systems Flash Recovery Area Nightly Apply Validated Incremental Weekly Archive To Tape Database Area

Oracle Suggested Strategy  Easy & Reliable – Integrates the Oracle DB 10g features  Fast Recovery Options – Backup and Recovery goes from hours to minutes

Automated Disk Based Backup & Recovery Benefits  Much faster backup – Just propagate changes to recovery area – Dramatic difference for large databases  Much faster restore – Copy backup files from the Flash Recovery Area – Or simply use the copy in the Flash Recovery Area  Much more reliable due to inherent reliability of disks – Tapes not needed for normal backup/recovery, only for archiving

Backup Management  List RMAN backups – View files included in a backup set  Perform maintenance – Remove obsolete backups with a single click

What is Transportable Tablespace? OS copy File 1 File 2 expdat.dmp File 1 File 2 expdat.dmp 24  Mechanism to quickly move a tablespace across Oracle databases  Most efficient means to move bulk data between databases. – File is simply copied at OS level

Oracle10g Cross Platform Transportable Tablespace Solaris (SPARC) Open VMS (Intel IA64) Windows (Intel IA32/64) Linux (Intel IA32/64) AIX (PowerPC) HP-UX (PA-RISC) Tru64 UNIX (Alpha) HP-UX (Intel IA64) Small Endian PlatformsBig Endian Platforms Simple File Copy Within These High Speed File Convert RMAN

Cross Platform Transportable Tablespace Benefits  Fast data distribution in Data Warehousing environment (data marts)  Used for publishing structured data (i.e. catalogs on CDs)  Sharing of read only tablespaces by heterogeneous systems  Allowing a database to be migrated from one platform to another

Other Oracle10 g Backup & Recovery Enhancements  Compression of archive logs and backups  Restore tolerates missing or corrupt backup – Automatically fails over to previous backup  Automated recovery through a previous point in time recovery – Recovery through resetlogs  Fully automated tablespace point-in-time recovery  Automatic channel failover on backup or restore  Time window based throttling of backups  Tablespace Rename  Drop Database

Oracle Database 10 g Unified Unified storage location of related recovery files Managed Managed disk space for recovery files automatically Simplified Simplified database administration tasks faster backup Much faster backup faster restore Much faster restore more reliable Much more reliable due to inherent reliability of disks

Next Steps High Availability Sessions from Oracle 11:00 AM How Oracle Database 10g Revolutionizes Availability and Enables the Grid 3:30 PM Oracle Recovery Manager (RMAN) 10g: Reloaded 5:00 PM Proven Techniques for Maximizing Availability 8:30 AM Oracle Database 10g - RMAN and ATA Storage in Action 11:00 AM Oracle Data Guard: Maximum Data Protection at Minimum Cost 1:00 PM Oracle Database 10g Time Navigation: Human-Error Correction 4:30 PM Data Guard SQL Apply: Back to the Future Wednesday in Moscone Room 304Tuesday in Moscone Room 304 For More Info On Oracle HA Go To

Next Steps High Availability Sessions from Oracle 8:30 AM in Moscone Room 304 Oracle Database 10g Data Warehouse Backup and Recovery: Automatic, Simple, Reliable 8:30 AM in Moscone Room 104 Building RAC Clusters over InfiniBand Thursday For More Info On Oracle HA Go To Real Application Clusters Data Guard Database Backup & Recovery Flashback Recovery LogMiner, Online Redefinition, and Cross Platform Transportable Tablespaces Database HA Demos All Four Days In The Oracle Demo Campground

Resources  HA OTN:  RMAN Discussion Forum otn.oracle.com  MetaLink MetaLink.oracle.com & Q U E S T I O N S A N S W E R S

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