Archiving | 3Com NSR-ORA V3.2 specs

Introduction

Archive Mode of the Database

NSR-ORA checks that the database is in ARCHIVELOG mode, and will abort the backup of the database if this is not the case if an online backup is to be car- ried out. An offline backup can be performed even if the database is not in ARCHIVELOG mode.

archive directory

database files	Oracles
	Oracles
	archiving
control file	process
control file
	redolog files
SYSTEM USER	TEMP

Tablespaces

Figure 3: Database running in ARCHIVELOG mode

The database system deals only with archiving, it does not provide for the subsequent management of the redolog files. The database will come to a halt as soon as the archive directory is full. NSR-ORA therefore contains a module which monitors the archiving process, the archiving monitor amon. At regular time intervals, the daemon of the archiving monitor transfers the redolog files archived by ORACLE to external backup media.

To make a full database backup, all file types must be included in the saving procedure.

Both the control file and the database programs (executables) can be backed up using standard NetWorker functions (i.e. without NSR-ORA).

For securing the database files, NSR-ORA supports full backup as well as restoration and recovery of the database by reapplying the redolog files.

For a backup, a correlation is first made between tablespaces and database files. In this manner, the logical tablespace concept of the database is mapped onto a physical structure, and the database files are then backed up. In the case of an online backup, the ORACLE-specific commands begin backup and end backup are included.

When a recovery is required, shutdown of the database is followed by a crash analysis. If a database file has been lost, the required backup files are first restored from the backup medium. The recovery of the database is subse- quently commenced; this involves reapplying the appropriate redolog files. If

System Administrator’s Guide

U42252-J-Z915-1-76

NSR-ORA V3.2 specifications

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