無料1Z0-1194-24試験ブレーン問題集認定ガイド問題と解答
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質問 # 15
Which of the following describes 'logical migration'?
- A. Extracting and converting data to a new format
- B. Migrating the database schema and data without physical file movement
- C. Moving entire database files as-is
- D. Using replication to synchronize data in real-time
正解：B
質問 # 16
Which of the following statements about DMS configuration is TRUE?
- A. It is a one-time setup that does not need to be revisited.
- B. It requires minimal documentation and can be completed quickly.
- C. It should align with both source and target database requirements.
- D. It is only necessary for initial database setups.
正解：C
解説：
DMS configuration should align with both source and target database requirements to ensure compatibility and successful migration.
質問 # 17
Which migration strategy is the most appropriate for a large-scale migration of multiple databases with varying sizes, workloads, and feature requirements to OCI, considering cost-efficiency and operational flexibility?
- A. Perform a homogeneous migration to an OCI Dedicated Region.
- B. Migrate all databases to a single, large Autonomous Database instance.
- C. Migrate all databases to a single Exadata Cloud Service Database VM.
- D. Utilize a combination of Autonomous Database and Database System options in OCI.
正解：D
解説：
Here's why:
Tailored Approach: Autonomous Database is ideal for databases with predictable workloads and simpler management requirements. Database System options, like Exadata Cloud Service Database VM, are better suited for databases with complex workloads and higher performance demands. By using a combination of both, you can optimize costs and performance for each database.
Cost-Efficiency: Autonomous Database can be a cost-effective option for smaller databases, while Database System options might be more cost-effective for larger, more complex databases.
Flexibility: This strategy offers flexibility as you can choose the most appropriate option for each database based on its specific needs.
Scalability: Both Autonomous Database and Database System options can be easily scaled up or down to meet changing requirements.
While the other options might be suitable in certain scenarios, they have limitations:
A). Migrate all databases to a single, large Autonomous Database instance. This might not be optimal for databases with varying workloads and requirements.
C). Migrate all databases to a single Exadata Cloud Service Database VM. This might be overkill for smaller databases and can be more expensive.
D). Perform a homogeneous migration to on-premises Oracle Cloud Infrastructure (OCI) Dedicated Region. While this option offers a familiar environment, it might not be the most cost-effective or flexible solution for a cloud migration.
質問 # 18
Which of the following considerations regarding target database options in OCI is MOST critical for a successful migration?
- A. You need to verify if the target database service tier supports all features used by the source database.
- B. The target database needs to be provisioned with the same number of CPUs as the source database.
- C. The target database service tier must offer sufficient storage capacity for the migrated data.
- D. The target database needs to be configured with the same character set as the source database.
正解：A
解説：
Here's why:
Feature Compatibility: Ensuring that the target database service tier supports all features used by the source database is essential to avoid compatibility issues and ensure a smooth migration.
Functionality: If the target database service tier does not support certain features, it might lead to data loss, performance degradation, or functional limitations.
Planning: Identifying and addressing feature compatibility issues before the migration can prevent unexpected problems and delays.
While the other options are also important considerations, they are generally less critical than feature compatibility:
A). The target database service tier must offer sufficient storage capacity for the migrated data. This can be easily addressed by provisioning adequate storage capacity.
B). The target database needs to be configured with the same character set as the source database. This can be easily configured during the migration process.
D). The target database needs to be provisioned with the same number of CPUs as the source database. While CPU resources are important, they can be adjusted based on performance requirements and load balancing.
質問 # 19
Which GoldenGate feature best facilitates minimizing downtime during the cutover phase when switching an application to a target database?
- A. Extract Pump with Streams Capture
- B. Filtered Trails with Extract Scripts
- C. Bi-directional Replication with Conflict Detection
- D. Initial Load with Ongoing Replication
正解：D
解説：
Here's a breakdown of why:
Initial Load with Ongoing Replication: This feature allows GoldenGate to perform an initial data load to the target database while simultaneously capturing and replicating changes from the source database. This ensures that the target database is up-to-date with the source during the cutover phase, minimizing downtime.
The other options are less suitable for minimizing downtime:
B). Extract Pump with Streams Capture is primarily used for data replication between different database platforms. It doesn't directly address minimizing downtime during cutover.
C). Filtered Trails with Extract Scripts can be used to filter data based on specific criteria but doesn't directly impact downtime during cutover.
D). Bi-directional Replication with Conflict Detection is used for scenarios where changes are made to both the source and target databases. While it can help with data consistency, it doesn't specifically address minimizing downtime during cutover.
質問 # 20
A company is planning to migrate a database used for internal analytics but doesn't require continuous real-time access. Which ZDM use case would be the least suitable for this scenario?
- A. Data masking to protect sensitive information during the migration process.
- B. Migration of a large database with a planned downtime window during off-peak hours.
- C. Rolling cutover strategy to migrate database partitions sequentially with minimal downtime.
- D. Database migration with minimal downtime to minimize user disruption.
正解：D
解説：
Here's a breakdown of why:
Internal analytics database: Since this database is used for internal analytics and doesn't require continuous real-time access, minimizing downtime is not a critical requirement. A planned downtime window during off-peak hours would be more suitable.
The other options are relevant:
B). Migration with a planned downtime window is appropriate for this scenario, as it allows for the migration to be scheduled during a time when the database is least used.
C). Data masking is important to protect sensitive information during the migration process, regardless of whether the database is used for internal analytics.
D). A rolling cutover strategy can be used to minimize downtime even if the database is not used for real-time access.
質問 # 21
we are planning to migrate a large database using RMAN. The database contains multiple tablespaces with varying levels of activity. How can you optimize the migration process for efficiency?
- A. Backup all tablespaces in a single backup set.
- B. Schedule full backups more frequently during migration.
- C. Use a single incremental backup for the entire database.
- D. Create separate backup sets for frequently accessed tablespaces.
正解：D
解説：
The most efficient way to migrate a large database with varying activity levels using RMAN is to create separate backup sets for frequently accessed tablespaces (option B). This allows for more granular control and faster recovery of critical data.
Here's why:
Prioritization: By separating frequently accessed tablespaces into their own backup sets, you can prioritize their recovery in case of issues, ensuring that critical data is restored first.
Efficiency: Backing up frequently accessed tablespaces separately can reduce backup times, as these tablespaces are often smaller and can be backed up more efficiently.
Flexibility: This approach offers more flexibility in case of errors or changes in the migration plan, as you can easily restore individual tablespaces or backup sets without affecting the entire database.
While option A (backing up all tablespaces in a single backup set) might seem simpler, it can lead to longer backup times and more complex recovery processes. Option C (using a single incremental backup) is not ideal for large databases with varying activity levels, as it can result in large backup sets and slower recovery times. Option D (scheduling full backups more frequently) might help with data consistency but can also increase backup times and storage requirements.
質問 # 22
which of the following statements is NOT a valid prerequisite for the source database?
- A. The source database must be in ARCHIVELOG mode.
- B. The source database must be compatible with the target MTCD container database version.
- C. The source database must use the same character set as the target MTCD.
- D. The source database must have Automatic Storage Management (ASM) enabled.
正解：D
解説：
While ASM can be beneficial for managing storage in a multitenant environment, it is not a strict requirement for Remote Cloning. The source database can be managed using other storage methods, such as Simple File System (SFS).
Here's a breakdown of the other statements:
A). The source database must be compatible with the target MTCD container database version. This is a valid prerequisite. The source and target database versions must be compatible to ensure successful Remote Cloning.
C). The source database must be in ARCHIVELOG mode. This is a valid prerequisite. ARCHIVELOG mode is required for point-in-time recovery, which is used to create consistent clones.
D). The source database must use the same character set as the target MTCD. This is a valid prerequisite. The source and target databases must use the same character set to avoid data corruption or encoding issues.
質問 # 23
In the context of Data Pump import with potential data inconsistencies, which of the following options provides the most robust error handling mechanism?
- A. Implementing user-defined error handling routines to manage data quality issues.
- B. Utilizing the RESUMABLE parameter to resume the import process after encountering errors.
- C. Disabling all constraints on the target tables before the import operation.
- D. Configuring the IGNORE parameter to skip rows with data errors during import.
正解：A
解説：
Here's a breakdown of why:
User-defined error handling: This approach provides the most flexibility and control over how data quality issues are handled during the import process. You can define custom routines to log errors, reject invalid data, or take other actions based on specific error conditions.
The other options are less robust:
A). Disabling constraints can lead to data integrity issues if not handled carefully. It's not a reliable error handling mechanism.
B). The IGNORE parameter can be useful for skipping rows with errors, but it may not be suitable for all scenarios, as it can lead to data loss.
C). The RESUMABLE parameter allows you to resume the import process after encountering errors, but it doesn't address the root cause of the data quality issues.
質問 # 24
Which of the following migration methods would be the MOST appropriate for minimizing downtime during peak hours?
- A. Data Pump Export/Import
- B. User Interface Migration through Oracle Cloud Infrastructure (OCI) Console
- C. GoldenGate for continuous availability
- D. Full Database Backup and Restore
正解：C
解説：
Here's why:
Continuous Replication: GoldenGate provides real-time data replication between source and target databases, ensuring minimal downtime during the migration process.
Minimal Disruption: As data is replicated continuously, there's no need for a lengthy downtime period for a full database backup and restore or for data pump export/import operations.
Flexibility: GoldenGate offers flexibility in terms of migration strategies, allowing you to choose the most suitable approach based on your specific requirements and downtime constraints.
While the other options might be suitable in certain scenarios, they are less effective at minimizing downtime during peak hours:
a) Full Database Backup and Restore: This method requires a significant downtime period, as the entire database needs to be backed up and restored.
b) Data Pump Export/Import: While Data Pump can be used for migration, it also requires downtime, especially for large databases.
d) User Interface Migration through Oracle Cloud Infrastructure (OCI) Console: This method is typically used for smaller databases and might not be suitable for large-scale migrations during peak hours.
質問 # 25
When migrating a database to an OCI Database Service, which of the following considerations is NOT directly related to the target environment?
- A. Virtual Cloud Network (VCN) compartment placement for the migrated database
- B. Network security configuration to control access to the migrated database
- C. Database character set and compatibility with the source database
- D. Storage options for data and backups, such as block volumes and archive storage
正解：C
解説：
While character set compatibility is crucial for data integrity, it's primarily a source database consideration. The target environment in OCI focuses on infrastructure aspects like storage, networking, and security.
質問 # 26
When migrating an Oracle Database to OCI using Data Pump, which of the following actions is NOT required during the Migration phase?
- A. Manually creating tables and indexes in the target database before import
- B. Configuring Data Pump import parameters for the target database
- C. Executing the Data Pump Import utility on the target database
- D. Executing the Data Pump Export utility on the source database
正解：A
解説：
Here's why:
Data Pump's functionality: Data Pump is designed to export and import entire database schemas, including tables, indexes, and other objects. It automatically creates the necessary structures in the target database based on the export file.
Efficiency and accuracy: Manually creating structures can be time-consuming and error-prone. Data Pump's automated process ensures consistency and efficiency.
The other actions are essential during the Migration phase:
a) Executing the Data Pump Export utility on the source database: This creates the export file containing the database schema and data.
b) Configuring Data Pump import parameters for the target database: This specifies the target database connection, import file location, and other relevant settings.
d) Executing the Data Pump Import utility on the target database: This imports the data from the export file into the target database, creating the necessary structures as needed.
質問 # 27
You are planning to migrate an Oracle Database to OCI using the Data Pump utility. What should you do to minimize the downtime during migration?
- A. Perform a full export during peak hours
- B. Use RMAN to duplicate the database
- C. Use Parallel Processing with Data Pump
- D. Manually copy the data files to OCI
正解：C
解説：
Data Pump supports parallel processing, which speeds up the export and import process, reducing the overall downtime during migration.
質問 # 28
How should GoldenGate be configured to handle the migration of materialized views and ensure data consistency on the target database?
- A. Disable materialized view refresh on the source database before and after migration.
- B. Configure GoldenGate to capture DML statements that update underlying tables of materialized views.
- C. Migrate materialized views after all other schema objects have been replicated.
- D. Utilize GoldenGate filtering to exclude materialized views from the migration.
正解：B
解説：
Here's a breakdown of why:
Materialized view updates: To ensure data consistency, GoldenGate should capture DML statements that update the underlying tables of materialized views. This allows the target database to refresh the materialized views based on the changes captured from the source.
The other options are incorrect:
A). Disabling materialized view refresh on the source database is not necessary and can lead to data inconsistencies.
B). Migrating materialized views after other schema objects can introduce delays and potential inconsistencies.
C). Filtering materialized views from the migration would prevent them from being replicated to the target database, leading to data inconsistencies.
質問 # 29
When configuring ZDM with GoldenGate for a database with high update frequency, which option within GoldenGate minimizes the impact on the source database performance?
- A. Selecting the "Extract All Changes" option to capture all data modifications, including DML and DDL.
- B. Configuring a large number of Extract threads to maximize the rate of data extraction from the source.
- C. Utilizing the "Trivial Capture" option to minimize the data captured from the source database.
- D. Enabling the "Queue Based Delivery" mode for accumulating changes before sending them to the target.
正解：D
解説：
Here's a breakdown of why:
Queue Based Delivery: This mode allows GoldenGate to accumulate changes in a queue before sending them to the target. This can help reduce the load on the source database by spreading out the network traffic and reducing the frequency of database operations.
The other options can have a negative impact on performance:
A). Capturing all changes, including DDL, can increase the load on the source database.
C). A large number of Extract threads can increase the load on the source database by generating more network traffic.
D). Trivial Capture can reduce the amount of data captured but may not be sufficient for high update frequency databases, as it can miss important changes.
質問 # 30
When migrating a database schema only (without data) using Data Pump, which export mode is recommended for the most efficient operation?
- A. Tables only export mode (TABLES) to extract only table definitions without data.
- B. User-specified export mode (USER_SPECIFIED) to selectively export specific schema objects.
- C. Full export mode (FULL) to capture all database objects including data.
- D. Schemas only export mode (SCHEMAS) to export schemas and their definitions.
正解：D
解説：
Here's a breakdown of why:
Schemas only export mode: This mode is specifically designed to export database schemas and their definitions, without including any data. It's ideal for schema-only migrations, as it avoids unnecessary data transfer and reduces the overall migration time.
The other options are less efficient or not suitable for schema-only migrations:
A). Full export mode includes data, which is unnecessary for schema-only migrations and can significantly increase the export time.
C). User-specified export mode requires you to manually specify which schema objects to export. While this can be useful for specific scenarios, it's not the most efficient way for a schema-only migration.
D). Tables only export mode is similar to schemas only export mode, but it doesn't include other schema objects like views, sequences, and indexes. For a complete schema migration, it's better to use the SCHEMAS mode
質問 # 31
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