Data Guard Server-side components Oracle Database Tips by Donald BurlesonDecember 3, 2015

Data Guard

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.