Space Management

Purpose

This section helps you develop an approach to managing the space of your Oracle database.

This section discusses the approach to space management.

For more information on how to perform space management, see Space Management with BR*Tools.

For more information on reorganization, see Segment Management

Prerequisites

You consider whether to use raw devices or a file system. Raw devices are generally 10 to 20% faster on UNIX systems. However, with Veritas Quick I/O the difference is reduced.

We recommend raw devices only for experienced database administrators because the administration is more complex. For example, only one Oracle file can be set up on each raw device.

Process Flow

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       1.      You monitor the database closely:

Ў        You regularly run the database system check so that you can detect space problems before they become serious.

Ў        If required, you run these reports on a one-off basis:

§         Showing Tablespaces with BR*Tools

§         Showing Data Files with BR*Tools

You also need to monitor available disk space at the operating system level with, for example:

Showing Disk Volumes with BR*Tools

Make sure that you plan for additional disks in time to accommodate data growth.

       2.      You manage tablespaces to:

Ў        Extend a tablespace by adding a new file to avoid overflow

Ў        Create a new tablespace, for example, when switching from a dictionary managed to a locally managed tablespace

Ў        Drop tablespaces, for example, after an upgrade

       3.      You manage data files to:

Ў        Resize the file, usually to prevent overflow

Ў        Turn on the Oracle AUTOEXTEND option to avoid data file overflow.

Ў        Move the data file, for example, after you have added new disk storage to your system and want to use it for existing data files.