Lessoon 04 Config Bu

8/12/2019 Lessoon 04 Config Bu

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Copyright 2007, Oracle. All rights reserved.

Configuring Backup Specifications


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Copyright 2007, Oracle. All rights reserved.4 - 2

Objectives

After completing this lesson, you should be able to: Use Enterprise Manager to configure backup settings

Enable control file autobackup

Allocate channels to use in backing up

Configure backup optimization


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Using RMAN to Create Backups

When creating a backup using RMAN, you can specify: Type: Full or incremental

Files to back up: Entire database, data files, control file,

server parameter file, archived redo log files

Backup type: Image copy or backup set Proxy options: Pass on to the Media Management Library

the responsibility of copying the files.


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Backup Destinations

Backups can be written to: Disk directory

Media Management Library

Typically used for disaster recovery, when disk backups are

lost Oracle Secure Backup provides one.

Flash Recovery Area

This is the disk area set aside for backup and recovery and

flashback database purposes.

Define the location and the size.

Files are automatically named by using Oracle Managed Files.

Files are automatically retained and deleted as necessary.


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Configuring Persistent Settings for RMAN

RMAN is preset with default configuration settings. Use the CONFIGUREcommand to:

Configure automatic channels

Specify the backup retention policy

Specify the number of backup copies to be created Set the default backup type to BACKUPSETor COPY

Limit the size of backup pieces

Exempt a tablespace from backup

Enable and disable backup optimization

Configure automatic backups of control files

Define the archivelog deletion policy

Specify the parallelism for a device

Set the encryption parameters to be used for backups


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Using Enterprise Manager to Configure

RMAN Settings


7/13Copyright 2007, Oracle. All rights reserved.4 - 7

Control File Autobackups

RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;

Best practice: Oracle recommends that you enable

control file autobackup.



Managing Persistent Settings

Use the SHOWcommand to list current settings:

Use the CLEARoption of the CONFIGUREcommand to reset

any persistent setting to its default value:

RMAN> SHOW CONTROLFILE AUTOBACKUP FORMAT;

RMAN> SHOW EXCLUDE;

RMAN> SHOW ALL;

RMAN> CONFIGURE BACKUP OPTIMIZATION CLEAR;

RMAN> CONFIGURE MAXSETSIZE CLEAR;

RMAN> CONFIGURE DEFAULT DEVICE TYPE CLEAR;



Configuring Devices for Backup

RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 3;

RMAN> CONFIGURE DEVICE TYPE DISK

2> BACKUP TYPE TO COMPRESSED BACKUPSET;

RMAN> CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COPY;



Configuring and Allocating Channels for

Use in Backups

Configure automatic channels with the CONFIGUREcommand:

Allocate channels manually with the ALLOCATE CHANNEL

command within a RUNblock:

RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 1;

RMAN> CONFIGURE DEFAULT DEVICE TYPE TO sbt;

RMAN> CONFIGURE CHANNEL DEVICE TYPE sbt ...

RMAN> BACKUP DATABASE;

RMAN> RUN

{

ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;

BACKUP DATABASE PLUS ARCHIVELOG;

}



Configuring Backup Optimization

The BACKUPcommand skips backing up files when theidentical files have already been backed up.

It is used when the following conditions are true:

Backup optimization is enabled.

BACKUP DATABASE, BACKUP ARCHIVELOGwith ALLorLIKEoptions, or BACKUP BACKUPSET ALLcommands are

executed.

Only one type of channel is allocated.

It can be overriden with the FORCEoption.

It is always used for RECOVERY AREA,DB_RECOVERY_FILE_DEST, and RECOVERY FILES

BACKUPoptions.

RMAN> CONFIGURE BACKUP OPTIMIZATION ON;



Summary

In this lesson, you should have learned how to: Use Enterprise Manager to configure backup settings

Enable control file autobackup

Allocate channels to use in backing up

Configure backup optimization


13/13Copyright 2007 Oracle All rights reserved4 16

Practice 4 Overview:

Configuring Backup Specifications

This practice covers the following topics: Configuring RMAN persistent settings

Configuring control file autobackup

Lessoon 04 Config Bu

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