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Oracle Cloud Database 2024 Migration Professional Sample Questions (Q51-Q56):
NEW QUESTION # 51
Which GoldenGate optimization technique can help mitigate performance overhead when using ETL capabilities?
Answer: D
Explanation:
Here's a breakdown of why:
GoldenGate transformation functions: These functions provide efficient and optimized ways to perform common data transformations within GoldenGate itself. By using these functions instead of custom ETL processes, you can reduce the overall processing overhead and improve performance.
The other options are less effective for optimizing performance:
A). Real-time replication is important for data consistency but doesn't directly address performance overhead related to ETL.
B). Materialized views can improve query performance on the target database but don't directly optimize GoldenGate's ETL capabilities.
C). Increasing the number of GoldenGate capture processes might improve data capture performance but doesn't necessarily reduce ETL overhead.
Therefore, utilizing built-in GoldenGate transformation functions is the most effective technique to mitigate performance overhead when using ETL capabilities within GoldenGate.
NEW QUESTION # 52
When utilizing Oracle Data Guard for ZDM with a standby database, which statement best describes the failover process after completing the initial full data synchronization?
Answer: B
Explanation:
Here's a breakdown of why:
Initial full data synchronization: This ensures both databases have the same data.
Remaining redo application: After the full data sync, the standby database needs to catch up on any changes that occurred on the primary during the synchronization process. This is done by applying the remaining redo logs.
Becoming primary: Once the standby database has applied all the remaining redo, it can be promoted to primary. This means it will start handling all read and write operations.
The other options are incorrect:
A: The primary database doesn't switch to read-only mode.
C: The standby database doesn't continue receiving redo during the failover process.
D: The failover process is not manual and doesn't require an application outage.
NEW QUESTION # 53
Which of the following is a critical factor to consider when configuring Zero Downtime Migration?
Answer: C
Explanation:
Compatibility between the source and target databases is critical to ensure that all features and data types are supported during and after migration.
NEW QUESTION # 54
In a Zero Downtime Migration (ZDM) scenario using Oracle GoldenGate, how does the system ensure data consistency between the source and target databases during the initial data load phase?
Answer: B
Explanation:
GoldenGate ensures data consistency during the initial data load phase by replicating transactions in the same order they were committed on the source database. This ensures that the target database receives the same updates in the correct sequence, maintaining data integrity.
Here's a breakdown of why the other options are incorrect:
A). GoldenGate automatically validates and corrects data inconsistencies during the load process: While GoldenGate has mechanisms to detect inconsistencies, it doesn't automatically correct them. The primary method for ensuring consistency is by replicating transactions in the correct order.
B). The initial load process involves applying redo generated on the source after the data copy: This is true, but it's a secondary step to ensure that the target database is up-to-date with any changes that occurred on the source after the initial data copy. The primary method for ensuring consistency is still replicating transactions in the correct order.
D). GoldenGate utilizes checksums and verification techniques to detect and resolve data discrepancies: While checksums and verification techniques can be used to detect data discrepancies, they are not the primary method for ensuring consistency. The primary method is still replicating transactions in the correct order.
NEW QUESTION # 55
Which migration method involves moving a database without any downtime?
Answer: D
NEW QUESTION # 56
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