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Data Guard Server-side components
Oracle Tips by Burleson Consulting
December 3, 2011
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< Data GuardDonald K. Burleson
Data Guard Serever-side, Sites and Resources
Data Guard Broker can manage all three layers
of the management model. Any operation performed on a higher level
of the model is applicable to all child objects of that layer. For
example, if the status of a site is changed to offline, all the
resources under that site will be offline. More information about
the management model will be presented in Chapter 7 of this book.
Server Side Components of the Broker
The server side component of Data Guard Broker
includes the Data Guard Monitor (DMON) process and a configuration
file. The Data Guard Monitor is a background process that runs on
each of the sites managed by Data Guard Broker. The configuration
file is a binary file that contains the properties and status of all
the sites in a configuration.
The DMON process is responsible for managing a
consistent copy of the configuration file across the entire
configuration. The DMON processes in a configuration communicate
over Oracle Net to control the role management and log management
services. In addition, the DMON process gathers statistics about the
health of a site that can be used for monitoring and fine-tuning.
The following diagram shows a sample Data Guard configuration
managed by Data Guard broker.
Figure 2.4 – The server side components of Data
Guard Broker.
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