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OCP Instructors Guide for Oracle DBA Certification

Chapter 5 - Oracle Database Objects

Locally Managed System Tablespaces

In Oracle9i Release 2, administrators are now able to create a locally managed SYSTEM tablespace. The EXTENT MANAGEMENT LOCAL clause can be used to create a locally managed SYSTEM tablespace during database creation or administrators can use the stored procedure dbms_space_admin.tablespace_migrate_to_local to migrate existing dictionary managed tablespaces to locally managed. Once you create or migrate to a locally managed SYSTEM tablespace, you are unable to create any dictionary-managed tablespaces in the database.

Care must be taken when using the aforementioned package to migrate SYSTEM tablespaces from dictionary managed to locally managed.  It is a requirement that all tablespaces (except those containing UNDO segments) be in READ ONLY mode for the migration process to successfully execute. If Oracle finds any tablespaces in READ WRITE mode, the error message states that the tablespaces must be placed in READ ONLY mode.

The problem is that if the administrator places any dictionary-managed tablespaces in READ ONLY mode, they will be unable to place them in READ WRITE mode after the SYSTEM tablespace is converted to locally managed. Administrators desiring to migrate their SYSTEM tablespaces to locally managed must migrate all READ WRITE dictionary managed tablespaces to locally managed tablespaces BEFORE MIGRATING THE SYSTEM TABLESPACE.

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

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