Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Book Image

Oracle Data Guard 11gR2 Administration : Beginner's Guide

Overview of this book

Data Guard is the high availability, disaster recovery and data replication solution for Oracle Databases. With the huge growth of Data Guard it's getting harder to encounter an Oracle DBA not dealing with Data Guard. Since it's a common DBA task to provide high availability of databases, Data Guard is a must-know topic for every Oracle Database Administrator."Oracle Data Guard 11g R2 Beginner's Administration Guide" is a practical guide that provides all the information you will need to configure and maintain Data Guard. This book will show you what Data Guard can really do.By following the practical examples in this book, you'll learn to set up your Data Guard Broker, the management framework for Data Guard configurations. Learn and implement different data protection modes, perform role transitions between databases (switchover and failover) and configure Active Data Guard. Next, we will dive into the features of Snapshot Standby. The book progresses into looking at Data Guard configuration with other Oracle products (such as EM, RAC, and RMAN) and patch databases in Data Guard. The final chapters will cover commonly encountered Data Guard issues and Data Guard best practices, which are very important to make a Data Guard configuration perfect and take maximum advantage of Data Guard properties.
Table of Contents (19 chapters)
Oracle Data Guard 11gR2 Administration Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Pop Quiz Answers
Index

Dealing with UNNAMED datafiles


There are some reasons for a file being created as UNNAMED in the standby database, including insufficient disk space on the standby site, non-privileged directory structure on standby database, or improper parameter settings related to file management.

The STANDBY_FILE_MANAGEMENT parameter enables or disables automatic standby file management in Data Guard. When automatic standby file management is enabled, file additions and deletions in the primary database are replicated to the standby database.

For example, we add a datafile in the primary database when the STANDBY_FILE_MANAGEMENT parameter on the standby database is set to MANUAL. Due to this parameter setting, it will create an UNNAMED file under $ORACLE_HOME/dbs, and this will cause the MRP process to be killed. Errors in the alert log file will be as follows:

Errors in file /u01/app/oracle2/diag/rdbms/india_ps/INDIAPS/trace/INDIAPS_pr00_691.trc:
ORA-01111: name for data file 10 is unknown - rename to...