Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?
Correct Answer: A,B,C
The Data Guard Monitor (DMON) process is a key component of Oracle Data Guard. It plays a crucial role in managing and monitoring the state of both the primary and standby databases in a Data Guard configuration. Performing role transitions when switchover requests are made (A): DMON is responsible for coordinating the switchover process between the primary and standby databases. This involves safely transitioning the roles of the databases to ensure data protection and availability. Maintaining information about all members of the broker configuration in binary configuration files (B): DMON maintains detailed information about the databases in the Data Guard configuration, including their roles, states, and network addresses. This information is stored in binary configuration files, which are used by the Data Guard Broker to manage the Data Guard environment. Activating role-based services appropriately in the various database instances of the configuration, based on the database role (C): DMON activates services that are appropriate for the role of each database in the Data Guard configuration. For example, it may activate different services on a primary database than on a standby database, based on the specific requirements of each role. Reference: Oracle Data Guard Concepts and Administration Oracle Data Guard Broker documentation
Question 42
Which THREE statements are true........ open in real time query mode, which becomes a new.
Correct Answer: A,C,F
When a physical standby database is opened in real-time query mode, which may be referred to as real-time apply when using Active Data Guard, certain operations can disrupt ongoing sessions. However, with features like Application Continuity and the proper configuration of initialization parameters such as STANDBY_DB_PRESERVE_STATES, user sessions and current buffers may be preserved during role transitions such as a switchover or failover. Specifically, the STANDBY_DB_PRESERVE_STATES parameter can be set to preserve none, all, or only user sessions during such transitions. This ensures that in-flight transactions are not lost and that users do not experience disruptions during the role transitions of a physical standby database. References * Oracle Data Guard Concepts and Administration * Oracle Database Licensing Information User Manual * Oracle Data Guard Broker User Manual
Question 43
Examine the fast-start failover configuration:
Correct Answer: A,B,C
Question 44
Which three actions are performed by the START PLAN procedure of the DBMS ROLLING package?
Correct Answer: B,C,D
The DBMS_ROLLING package facilitates a rolling upgrade process across a Data Guard configuration. The START PLAN procedure in particular handles several critical actions, including: * Creating a guaranteed restore point on the standby databases (B): This ensures that the standby databases can be reverted to their state before the rolling upgrade process in case of any issues. * Building a LogMiner dictionary on the primary database instance (C): This is necessary for logical standby databases to interpret redo data during the SQL Apply process. * Creating a guaranteed restore point on the primary database (D): Similar to the standby databases, this ensures that the primary database can be reverted to a known good state if necessary.References: * Oracle Database PL/SQL Packages and Types Reference * Oracle Data Guard Concepts and Administration Guide
Question 45
Attempting to start the observer raises an error: DGMGRL> start observer; DGM-16954: Unable to open and lock the Observer configuration file Failed. Identify two possible ways to start the observer successfully.
