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問題 #18
Your Data Guard environment has one physical standby database using Real-Time Query. Two sequences have been created by these SQL statements:

Neither sequence has been used since being created.
Session 1 connects to the primary database instance and issues these two SQL statements:
SELECT a.nextval FROM DUAL; SELECT b.nextval FROM DUAL;
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?
Then session 2 connects to the physical standby database instance and issues the same SQL statements. Which output will be seen for session 2?

• A.
• B.
• C.
• D.

答案：B

解題說明：
In Oracle, a sequence created with the GLOBAL keyword is available and can produce values across all sessions and instances. However, a sequence created with the SESSION keyword is only specific to the session it was created in. When the NEXTVAL is called for a sequence, it will increment according to the sequence's properties set during its creation.
Given the sequence creation statements and the actions performed:
* The a sequence is global, which means it is available across the entire database, including the standby database with Real-Time Query enabled. So, when session 2 calls a.nextval, it will get the next value in the sequence, which is 21 since session 1 already retrieved 1.
* The b sequence is session-specific, so when session 2 calls b.nextval, it will get the value 1 because for this new session on the standby, this is the first time the sequence is being accessed.
Therefore, the output for session 2 will be a output as 21 and b output as 1, which corresponds to Option C.
References: The behavior of global vs session-specific sequences is outlined in Oracle's SQL Language Reference under the CREATE SEQUENCE statement documentation.

 

問題 #19
Which THREE are among the various tasks performed by the Data Guard Monitor (DMON) process?

• A. performing role transitions when switchover requests are made
• B. activating role-based services appropriately in the various database instances of the configuration, based on the database role
• C. communicating with dkon processes in other database instances that are part of the broker configuration
• D. maintaining information about all members of the broker configuration in binary configuration files.
• E. communicating with the DMON process of the observer to monitor a primary database in case a fast start failover is required

答案：A,B,D

解題說明：
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

 

問題 #20
Which THREE statements are true about Far Sync instances?

• A. They enable standby databases to be configured at remote distances from the primary without impacting performance on the primary.
• B. They work with any protection level.
• C. A primary database can ship redo directly to multiple Far Sync instances.
• D. The Data Guard Broker must be used to deploy and manage Far Sync instances.
• E. They use an spfMe, a standby controlfile, and standby redo logs.

答案：A,C,D

 

問題 #21
You are licensed to use Oracle Active Data Guard.
Which TWO statements are true after enabling block change tracking on a physical standby database?

• A. It allows fast incremental backups to be offloaded to the physical standby database.
• B. It starts the CTWR process on the primary database instance.
• C. It starts the RVWR process on the physical standby database instance.
• D. It allows fast incremental backups to be taken on the primary database.
• E. It starts the CTWR process on the physical standby database instance.
• F. It allows fast incremental backups to be offloaded to a snapshot standby database, when the physical standby database is converted.

答案：A,C

解題說明：
Block change tracking is a feature that enhances the efficiency of incremental backups by recording changed blocks in a tracking file. When used with Oracle Active Data Guard:
* It starts the RVWR process on the physical standby database instance (A): When block change tracking is enabled on a physical standby database, the Recovery Writer (RVWR) process is initiated.
This process is responsible for recording the changes to blocks in the block change tracking file, which is then used to optimize incremental backups.
* It allows fast incremental backups to be offloaded to the physical standby database (E): With block change tracking enabled on the physical standby database, fast incremental backups can be offloaded from the primary database. This reduces the workload on the primary database and utilizes the standby database for backup operations, improving overall system performance and efficiency.References:
* Oracle Database Backup and Recovery User's Guide
* Oracle Active Data Guard documentation

 

問題 #22
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?

• A. It succeeds only if SQL apply is stopped before deleting the SQL Apply filter.
• B. It succeeds but the SQL Apply filters are not deleted.
• C. It succeeds only if all DML statements executed on the primary have been applied on the logical standby deleting the SQL Apply filter.
• D. It deletes both the SQL Apply filters.
• E. It returns an error because the syntax to delete a SQL Apply filter must specify the same object names as specified when the filter was added.

答案：D

解題說明：
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.

 

問題 #23
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