Understanding the Data Guard broker components in Oracle 19c is essential for effectively managing and maintaining a Data Guard environment. This tutorial will guide you through the components and their functions, emphasizing the importance of the Data Guard broker in the overall architecture.
The Oracle 19c Data Guard broker simplifies the creation, management, and monitoring of Data Guard configurations. By automating many tasks, it ensures high availability, data protection, and disaster recovery. In this tutorial, we will explore the key components of the Data Guard broker and their roles in the Data Guard architecture.
Data Guard Broker Components
Primary Database
The primary database is the main database that processes transactions. It sends redo data to the standby databases, ensuring that all changes are replicated and the data is consistent across the Data Guard environment.
Standby Database
Standby databases are copies of the primary database. They receive and apply redo data to maintain synchronization with the primary database. Standby databases can be physical, logical, or snapshot, each serving different purposes and offering varying levels of data protection and availability.
Data Guard Monitor (DMON)
Data Guard components – The Data Guard monitor (DMON) is a background process that runs on each database in the Data Guard configuration. It is responsible for managing and monitoring the broker configuration, ensuring that all components are functioning correctly and that the configuration is consistent.
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Configuration Files
Configuration files store information about the Data Guard setup, including the databases involved and their roles. These files are crucial for maintaining consistency and managing the configuration across different instances.
User Interfaces
Oracle Enterprise Manager Cloud Control
Cloud Control provides a graphical interface for managing the Data Guard broker. It simplifies tasks such as creating and managing standby databases, monitoring the configuration, and performing switchovers and failovers.
Oracle Data Guard Command-Line Interface (DGMGRL)
The DGMGRL is a command-line interface that allows administrators to manage and monitor the Data Guard configuration. It provides commands to perform various tasks such as creating and adding standby databases, initiating switchovers and failovers, and checking the configuration status.
Data Guard components – Setting Up the Data Guard Broker
To set up the Data Guard broker, you need to configure the primary and standby databases and enable the broker processes.
Primary Database Configuration
Ensure the primary database is in ARCHIVELOG mode and configure the necessary parameters:
ALTER SYSTEM SET dg_broker_start=true;
ALTER SYSTEM SET dg_broker_config_file1='/shared_location/drcf_primary1.dat' SCOPE=BOTH;
ALTER SYSTEM SET dg_broker_config_file2='/shared_location/drcf_primary2.dat' SCOPE=BOTH;
Standby Database Configuration
Configure the standby database similarly:
ALTER SYSTEM SET dg_broker_start=true;
ALTER SYSTEM SET dg_broker_config_file1='/shared_location/drcf_standby1.dat' SCOPE=BOTH;
ALTER SYSTEM SET dg_broker_config_file2='/shared_location/drcf_standby2.dat' SCOPE=BOTH;
Ensure the configuration files are in a shared location if you are using Oracle RAC.
Data Guard components – Managing the Data Guard Broker
Once the broker is set up, you can use Cloud Control or DGMGRL to manage the configuration. Here are some common tasks:
Adding a Standby Database
Use Cloud Control or DGMGRL to add a new standby database to the configuration:
DGMGRL> ADD DATABASE standby_db AS CONNECT IDENTIFIED BY password;
Performing a Switchover
Switch the roles of the primary and standby databases:
DGMGRL> SWITCHOVER TO standby_db;
Monitoring the Configuration
Check the status of the Data Guard configuration:
DGMGRL> SHOW CONFIGURATION;
Conclusion
Understanding the Data Guard broker components in Oracle 19c is crucial for maintaining a robust and efficient Data Guard environment. The broker automates and simplifies many tasks, ensuring high availability and data protection. By following this guide, you can effectively set up and manage your Data Guard configuration, leveraging the full capabilities of the Data Guard broker.
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