Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Data Guard Broker States & Properties

Oracle Database Tips by Donald BurlesonDecember 9, 2015

Oracle Data Guard - States and Properties

These two terms will appear several times in this text; therefore, the definition for each term is listed below:


A state defines the condition of a database such as whether the database is open, closed, open for query only, etc. A primary database can be in the ONLINE, LOG-TRANSPORT-OFF or OFFLINE state.  In the LOG-TRANSPORT-OFF state, the primary database will suspend the log transport services to the standby databases. The archiver process will continue to archive to local archiving destinations.

A physical Oracle instance can be in the ONLINE, READ-ONLY, LOG-APPLY-OFF, or OFFLINE state. In the ONLINE state, the physical Oracle instance is in managed recovery mode. Similarly, in the READ-ONLY state, the database is open for query. In the LOG-APPLY-OFF state, the database is mounted in physical standby mode, but the recovery is not started.

Broker States and Properties - Broker states

A logical Oracle instance can be in the ONLINE, LOG-APPLY-OFF or OFFLINE state. In the LOG-APPLY-OFF state, the logical Oracle instance is open for read-only queries. In the OFFLINE state, the broker shuts down the database, stops the managed recovery process and disables the site in the configuration. Both the primary and the standby site have similar behaviour in the OFFLINE state.


Properties are the atomic level attributes of a database. There are two types of properties: monitorable and configurable. Monitorable properties can only be viewed, but configurable properties can be modified and controls the behaviour of the database.

Preparing to Use Data Guard Broker

Before going into the details of management and administration using Data Guard broker, please read the following pre-requisites and the starting up of Data Guard broker. Set the following parameters in initialization parameter file:

  • dg_broker_config_file2='filespec1'

  • dg_broker_config_file2='filespec2'

These two parameters specify the location of the broker configuration files. In absence of these parameters, the broker configuration files are created in an operating system dependent location with an operating system dependent file naming convention.

The above text is an excerpt from the book: Oracle Data Guard Handbook

Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.