Introduction

The Physical Database Structure

2.1The Physical Database Structure

The physical database (see figure 1) consists of at least one control file, one parameter file, at least two redolog files and at least one database file.

control file

redolog files

database file

configuration file

Figure 1: The physical database structure

The database file(s) contain the data dictionary as well as the actual user data (tables, indices, views etc.).

The redolog files contain information on database recovery. They instantly record any change made regarding the database. A database always possesses at least two redolog files which are written cyclically.

The control file(s) contain structural and management information.

In the configuration file specifies the configuration of a database.

A database also possesses suitable programs (executables), which ensure its functionality and form the Database Management System (DBMS).

2.2The Logical Database Structure

At the logical level (see figure 2), ORACLE only recognizes tablespaces (data- base-specific, user-defined and temporary) consisting of at least one physical database file. This tablespace structure also constitutes a backup unit for NSR- ORA. The allocation between tablespaces and the corresponding files is per- formed by NSR-ORA.

System Administrator’s Guide

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3Com NSR-ORA V3.2 manual Physical Database Structure, Logical Database Structure, Introduction

NSR-ORA V3.2 specifications

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