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DBA 101 Bootcamp
New DBA Series
Backup 101
April 12, 2011 1Paper #352
Definitions
• Archivelogmode
• Noarchivelogmode
• Shutdown normal
• Shutdown immediate
• Shutdown transactional
• Shutdown abort
April 12, 2011 2Paper #352
Definitions cont’d
• Consistent
• Inconsistent
• Control Files
• Data Files
• Redo Logs
• Archive Logs
April 12, 2011 3Paper #352
Definitions cont’d
• Physical Backup
• Logical Backup
• RMAN client
• Target database
• Recovery catalog database
• Recovery catalog schema
April 12, 2011 4Paper #352
Definitions cont’d
• User Managed Backups
• Hot Backup
• Cold Backup
• Flash/Fast recovery area
April 12, 2011 5Paper #352
User Managed Backups (Physical)
• YOU manage the:– Who– What – Where– When– Why– How
April 12, 2011 6Paper #352
User Managed Backups cont’d
• Cold (consistent noarchivelogmode) backup– (g)v$datafile– (g)v$controlfile– Shutdown (any mode EXCEPT ABORT)– Copy datafiles and 1 copy of controlfile to
“other” location.
April 12, 2011 7Paper #352
User Managed Backups cont’d
• Cold (consistent archivelogmode) backup– Same as consistent noarchivelogmode AND– (g)v$archived_log– That’s it for COLD backups, any questions
before we move on?
April 12, 2011 8Paper #352
User Managed Backups cont’d• Hot (inconsistent) backup
– Implies archivelogmode– Same as cold consistent archivelogmode– Put tablespaces in backup mode– Copy datafile– Take tablespaces out of backup mode– Switch logfile– Backup controlfile to trace
April 12, 2011 9Paper #352
User Managed Backups cont’d
• Questions to ponder:– We never backed up redo logs, why?– Why was methodology different for control file
backup?– Why did we only backup 1 copy of the control
file?
April 12, 2011 10Paper #352
User Managed Backups Logical
• Export (old exp command, shouldn’t be used anymore)
• Data Pump– Whole presentation in itself.– Look at today at 11:45 for a datapump
presentation.
April 12, 2011 11Paper #352
Recovery Manager (RMAN) Backups
• What is RMAN?
• How do you access it?– Command line– OEM
• What is a repository and do I need one?
April 12, 2011 12Paper #352
Recovery Manager (RMAN) Backups cont’d
• Connecting– connect catalog userid/password@______– connect target / or
userid/password@_______
April 12, 2011 13Paper #352
Recovery Manager (RMAN) Backups cont’d
• Types of backups– Full– Incremental– Archivelog– Control File – Tablespace– Data File
April 12, 2011 14Paper #352
Recovery Manager (RMAN) Backups cont’d
• Full– Backup database [plus archivelog];
• Incremental– Backup incremental level 0 database;– Backup incremental level 1 database;
April 12, 2011 15Paper #352
Recovery Manager (RMAN) Backups cont’d
• Archivelog– Backup archivelog all [delete input];
• Controlfile– Backup current controlfile;
April 12, 2011 16Paper #352
Recovery Manager (RMAN) Backups cont’d
• Tablespace– Backup tablespace tsname;
• Datafile– Backup datafile number;– Backup datafile “full path”;
April 12, 2011 17Paper #352
Recovery Manager (RMAN) Backups cont’d
• Reporting– List backup– Delete backup
April 12, 2011 18Paper #352
Recovery Manager (RMAN) Backups cont’d
• Questions to ponder:– Why do a controlfile backup AFTER the
database backup?– Why can’t I do a backup of my noarchivelog
mode database while its running?– Repository or no repository?
April 12, 2011 19Paper #352
Pros/Cons• User Managed:
– Pros: • You control all of it, control freaks, is this you?• It’s easy to just copy a file from a backup place to
its original place
– Cons:• You control all of it.• You have to maintain repository of when things
were backed up last, etc.
April 12, 2011 20Paper #352
Pros/Cons cont’d
• RMAN managed:– Pros:
• Oracle manages it all, you barely have to think about it
• What has been backed up is kept for you automatically.
April 12, 2011 21Paper #352
Pros/Cons cont’d
• RMAN managed:– Cons:
• You control freaks might not like Oracle “taking over it all”
• Not just being able to cp a file from a backup location to the original location, you have to get RMAN involved.
April 12, 2011 22Paper #352
Take home thought
• Backups are important but are useless if they can't be recovered, so test your recovery plan.
April 12, 2011 23Paper #352
Demo
• Do you have a playground?
• If not, why not? You need one
• We’ll look at– User managed backup, both hot and cold– Recovery Manager(RMAN) backups full,
incremental, tablespace, datafile, archivelog and control file.
April 12, 2011 24Paper #352
Contact Info
• Joe Testa– Cell: 614-774-3595– Email:
• [email protected]• [email protected]• [email protected]
– Facebook: joseph.s.testa– Twitter: n8xct
April 12, 2011 25Paper #352
