Delete Older Files in Linux

RMAN backup and logical backup With Different User

Step 1: Create the user

CREATE USER bkp_user IDENTIFIED BY bkp_user DEFAULT TABLESPACE users TEMPORARY 
TABLESPACE temp PROFILE DEFAULT; 
GRANT CONNECT TO bkp_user; 
GRANT exp_full_database TO bkp_user; 
GRANT imp_full_database TO bkp_user; 
GRANT recovery_catalog_owner TO bkp_user; 
GRANT select_catalog_role TO bkp_user; 
GRANT CREATE SESSION TO bkp_user; 

Step 2: Connect RMAN with the Above Created User

$ rman

RMAN> connect target bkp_user/bkp_user

RMAN> backup database;

Note: Script can be written and job can be scheduled to take backup.

Oracle RMAN Commands List

Here is the list of key most RMAN commands that are used for Backup and related activities:

LIST Commands

LIST Commands are generic RMAN commands that will show/list various types of information when executed within RMAN utility.

RMAN> list backup;

It lists all the backups taken using RMAN utility.

RMAN> list backup of database;

The above command lists out all the (individual) files that are in the backup.

RMAN> list backup of tablespace system;

The above command lists out all the files that are in the backup that belong to the tablespace ‘system’.

RMAN> list backup of control file;

The above command lists out all backups of the control file.

CONFIGURE Commands

CONFIGURE commands in RMAN are used to configure/setup various initial settings:

RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY2;

The above commands indicates how many days the backup copies need to be retained. Default is 1 day.

RMAN> CONFIGURE RETENTION POLICY CLEAR;

The above command resets the Retention policy to the default value of 1 day.

CONFIGURE BACKUP OPTIMIZATION ON;

The above command verifies to make sure that identical files are NOT backed up to the device specified.

CONFIGURE BACKUP OPTIMIZATION CLEAR;

The above command resets the Optimization option to the default value.

SHOW Commands

Show commands are used to show/display the configuration setting values.

RMAN> show all;

The above command shows all the current configuration settings on the screen.

RMAN> show retention policy;

The above command shows the current retention policy.

RMAN> show default device type;

The above command shows the default device type configured for backups.

RMAN> show datafile backup copies;

The above command shows the number of backup copies available in the target database.

BACKUP Commands

Backup commands are the real commands which do the actual backup work.

RMAN> backup database;

The above command backs up the database (target).

RMAN> backup database include current controlfile plus archive log;

The above command backs up the target database and the current control file and archive log files.

REPORT Commands

Report commands list/report specific information. The difference between report and list command is report command output is in a better format.

RMAN> report obsolete;

The above command reports which backups can be deleted.

DELETE Commands

Delete commands delete/remove specific items from the server, repository catalog.

RMAN> delete obsolete;

The above command deletes all the backups that are older based on the retention policy setup.

Rac Voting Disk

The Voting Disk File is a file on the shared cluster system or a shared raw device file.

Voting disk a key component of clusterware and its failure can lead to inoperability of the cluster.

In RAC at any point in time the clusterware must know which nodes are member of the rso that

• it can perform load balancing
• In case a node fails, it can perform failover of resources as defined in the resource profiles
• If a node joins, it can start resources on it as defined in OCR/OLR
• If a node joins, it can assign VIP to it in case GNS is in use
• If a node fails, it can execute callouts if defined