{"id":889,"date":"2008-10-05T13:43:13","date_gmt":"2008-10-05T17:43:13","guid":{"rendered":"http:\/\/onlineappsdba.com\/index.php\/2008\/10\/05\/oracle-database-rman-overview\/"},"modified":"2008-10-05T13:43:13","modified_gmt":"2008-10-05T17:43:13","slug":"oracle-database-rman-overview","status":"publish","type":"post","link":"https:\/\/onlineappsdba.com\/index.php\/2008\/10\/05\/oracle-database-rman-overview\/","title":{"rendered":"Oracle Database – RMAN overview"},"content":{"rendered":"

Solution available for backup and recovery of Oracle Database
\ni<\/strong>) RMAN<\/strong> (Recovery Manager)
\nii<\/strong>) User Managed<\/strong> backup (using o.s. commands like cp, copy..)<\/p>\n

.<\/p>\n

RMAN<\/strong> (Recovery Manager) – is Oracle Database client that perform backup & restore task of oracle database.<\/p>\n

.
\nComponents in RMAN<\/strong><\/u><\/p>\n

1. Target Database<\/strong> – is Oracle database which you want to backup or restore. You use RMAN client<\/strong> to connect to Target Database.<\/p>\n

2. RMAN Client<\/strong> – is Oracle executable<\/strong> that interprets backup\/restore related commands and direct server to execute those commands on Target Database.<\/p>\n

3. RMAN Repository<\/strong> – RMAN maintains metadata about its operations, this RMAN metadata is called as RMAN repository and stored in control file<\/strong> of database.<\/p>\n

4. Recovery Catalog<\/strong> (Optional Component) – Separate database schema to record RMAN activity against one or more TARGET database.<\/p>\n

5. Media Manager<\/strong> (Optional Component) – Application for RMAN to interface with sequential media devices like tape library. Job of media manager is to load , label , unload ….media devices.<\/p>\n

“You can use RMAN with or Without Recovery Catalog<\/strong> and Media Manager<\/strong><\/font>”<\/p>\n

.<\/p>\n

Terminology in RMAN<\/strong><\/u>
\n
\na) Backup Set<\/strong> – is one or more backup piece (physical files) written in format that only RMAN can access.<\/p>\n

b) Image Copy<\/strong> – is bit-by-bit copy of database files created on Disk. This is equivalent to cp<\/strong> (on Linux) or copy<\/strong> (on windows).<\/p>\n

* Backup Set is default method to backup, for image copy use BACKUP AS COPY while backup<\/font>.<\/p>\n

c) Hot backup<\/strong> – backup taken while Oracle Database is Up. (Database should be in “Archive Log<\/strong>” mode for hot backup)<\/p>\n

d) Cold backup<\/strong> – backup taken while Oracle database is down or in mount state<\/strong> (NOT OPEN).<\/p>\n

e) Full Backup<\/strong> – Backing up entire database is called as full backup<\/p>\n

f) Incremental Backup<\/strong> – Backup of block level changes to database made after previous incremental\/full backup.<\/p>\n

g) “Level 0” Incremental backup<\/strong> – This backs up all blocks in database. This is equivalent to full backup.<\/p>\n

h) “level 1” Incremental backup<\/strong> – This backs up database block changes after previous incremental backup.
\nIf there is no level 0<\/strong> incremental backup and you run level 1<\/strong> incremental backup, RMAN will automatically make level 0 incremental<\/font> backup.<\/font><\/p>\n

i) Cumulative incremental backup<\/strong> – level 1 incremental backup which includes all blocks changed since most recent level 0<\/strong> incremental backup.<\/p>\n

j) Differential incremental backup <\/strong>– level 1 incremental backup which includes only block changed since most recent incremental backup.<\/p>\n

By default, incremental backups are differential<\/font>
\n.<\/p>\n

Basic Commands in RMAN<\/strong><\/u>
\n1. Start RMAN client<\/strong>
\nrman<\/strong>\u00a0 (rman executable is in $ORACLE_HOME\/bin)<\/p>\n

2. Connect to target database<\/strong> (start RMAN client as shown above)
\nRMAN<\/strong>> connect target sys@TNS_ALIAS_FOR_TARGET
\nlike
\nRMAN><\/strong> connect target sys@PROD<\/p>\n

To connect to local database use operating system authentication
\nRMAN><\/strong> connect target \/<\/p>\n

3. To exit from RMAN client<\/strong>
\nuse EXIT like
\nRMAN><\/strong> exit<\/p>\n

4. To view current RMAN configuration<\/strong><\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> SHOW ALL<\/p>\n

5. To backup database and archived redo<\/strong> while system is Up (Hot Backup)<\/p>\n

Database should be in archive log mode<\/font><\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> BACKUP DATABASE PLUS ARCHIVELOG;<\/p>\n

6. To make consistent backup<\/strong> while database is not open<\/strong> (Database in No archive log mode)<\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> SHUTDOWN IMMEDIATE (to shutdown database)
\nRMAN><\/strong> STARTUP MOUNT;
\nRMAN><\/strong> BACKUP DATABASE; (to backup database, no need to backup archived log as database is not open)
\nRMAN><\/strong> ALTER DATABASE OPEN; (To Open Database )<\/p>\n

.<\/p>\n

7. To make incremental backup<\/strong><\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> BACKUP INCREMENTAL LEVEL 0 DATABASE; (For incremental level 0 backup)
\nRMAN><\/strong> BACKUP INCREMENTAL LEVEL 1 DATABASE; (For incremental level 1 backup)<\/p>\n

.<\/p>\n

8. To List backup<\/strong><\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> LIST BACKUP ; (To list backup)
\n.<\/p>\n

9. To Delete Obsolete backup<\/strong><\/p>\n

rman<\/strong> (To start RMAN Client)
\nRMAN><\/strong> connect target \/ (to connect to target database)
\nRMAN><\/strong> DELETE OBSOLETE ; (To DELETE obsolete backup)
\n.<\/p>\n

Scripting of RMAN, Recovery?restore using RMAN and Advanced topics coming soon…
\n<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"

Solution available for backup and recovery of Oracle Database i) RMAN (Recovery Manager) ii) User Managed backup (using o.s. commands […]<\/p>\n","protected":false},"author":115,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[424],"tags":[],"class_list":["post-889","post","type-post","status-publish","format-standard","hentry","category-database"],"yoast_head":"\nOracle Database - 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