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. References: * Oracle Data Guard Concepts and Administration * Oracle Data Guard Broker documentation
Question 17
A customer has these requirements for their proposed Data Guard implementation: 1. Zero data loss must still be guaranteed through the loss of any one configuration component. 2. The primary database must be protected against a regional disaster. 3. Performance overheads on the primary should be minimized as much as possible given these requirements. 4. Downtime on the primary database for any reason must be kept to a minimum. Components referred to in the broker commands are:
Correct Answer: C
According to the requirements stated: * Zero data loss must be guaranteed despite the loss of any one component: This necessitates synchronous redo transport to at least one standby database (for no data loss). * The primary database must be protected against a regional disaster: This implies that there must be a standby database in a different region. * Performance overhead on the primary should be minimized: This suggests that asynchronous transport should be used where possible to reduce the performance impact on the primary. * Downtime on the primary for any reason must be kept to a minimum: This is indicative of a requirement for a fast failover mechanism, possibly with a fast-start failover (FSFO) and high availability. Given these requirements, the appropriate option that fulfills all these is: * Option C, where 'prima' is the primary database, 'fs1' is the Far Sync instance in the primary region, and 'physt' and 'physt2' are physical standby databases in the primary and remote regions, respectively. In this configuration: * 'prima' is set to send redo to 'fs1' using SYNC to guarantee zero data loss. * 'fs1' is set to send redo to 'physt' (local standby) using FASTSYNC, which is a low-latency synchronous transport that is optimized for performance. * The Data Guard configuration's protection mode is set to MAXAVAILABILITY to provide the highest level of data protection that is possible without compromising the availability of the primary database. This configuration ensures that there is zero data loss even if the primary region is completely lost, maintains performance by limiting the synchronous transport to the local region with a Far Sync instance, and has a remote standby database in a separate region for disaster recovery purposes. References: * Oracle Data Guard Concepts and Administration * Oracle Data Guard Broker documentation
Question 18
Which four statements are true regarding SQL Apply filters for a logical standby database?
Correct Answer: A,B,C,G
Based on the Oracle Database 19c documentation, the correct answers about SQL Apply filters for a logical standby database are: A). They can be used to skip execution of DML triggers on a table while allowing the DML to execute. B). They can be used to skip CREATE TABLE commands. C). They can be used to skip ALTER SYSTEM and ALTER DATABASE commands. G). They can be used to skip ALTER TABLE commands on specific tables. Comprehensive Detailed Explanation: SQL Apply filters in a logical standby database can be set to control which SQL operations are applied to the standby. These filters allow for certain commands to be skipped, ensuring that they do not impact the standby database. For example, filters can be used to skip the execution of DML triggers to prevent them from firing during SQL Apply, while still allowing the underlying DML to be executed on the logical standby database. This is particularly useful when certain triggers are not desired to run in a standby environment. CREATE TABLE, ALTER SYSTEM, ALTER DATABASE, and specific ALTER TABLE commands can also be skipped using SQL Apply filters to prevent unwanted structural changes or administrative operations from affecting the logical standby database. These capabilities provide a level of control to ensure that the logical standby database reflects only the desired state of the primary database. Reference: Oracle Database SQL Language Reference and Oracle Data Guard Concepts and Administration guide offer comprehensive details on the use of SQL Apply filters, including the range of SQL statements that can be influenced by these filters in a logical standby database environment.
Question 19
A customer asks for your recommendation regarding this requirement: 1. We plan to have a Data Guard Configuration with one primary database and one physical standby database. 2. We want zero data loss in case of a disaster involving the loss of one component. 3. We want to do Real Application Testing occasionally on the Standby Database. Which solution, if any, satisfies these requirements?
Correct Answer: B
Synchronous redo transport for zero data loss (B): To guarantee zero data loss in the case of a disaster, synchronous redo transport must be configured between the primary and standby databases. Conversion to snapshot standby for testing (B): A physical standby database can be temporarily converted into a snapshot standby database to perform real application testing. After testing is completed, the snapshot standby can be converted back to a physical standby to resume its disaster recovery role. Reference: Oracle Data Guard Concepts and Administration Guide Oracle Database Testing Guide
Question 20
On your logical standby database, you specified these rules: After completion of the weekend batch cycle you attempt to delete the SQL Apply filters: Which is TRUE regarding the execution of the UNSKIP procedure?
Correct Answer: B
The execution of the UNSKIP procedure is designed to remove SQL Apply filters that have been previously set up on a logical standby database. Based on the provided statements, the UNSKIP procedure is directed to delete any SQL Apply filters for DML statements associated with objects in the 'HR' schema that start with 'EMP'. Since both SKIP procedures had the same schema name ('HR') and statement type ('DML'), and the UNSKIP procedure uses a wildcard (%) for the object name, it will successfully remove both of the SQL Apply filters for 'EMP_NEW' and 'EMP_OLD', as both object names match the pattern provided in the UNSKIP procedure. References:Oracle's Data Guard documentation and SQL Language Reference provide insights into managing SQL Apply filters on a logical standby database using the DBMS_LOGSTDBY package. This includes adding and removing filters through SKIP and UNSKIP procedures.
