Exam Name: Assessment: InfoSphere DataStage v8.5
Certification Provider: IBM
Corresponding Certification: IBM Specialist
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IBM A2090-421 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| DataStage Architecture and Components | 20% | - Parallel framework concepts - InfoSphere Information Server architecture - Client and server components - Project and repository management |
| Job Design and Development | 30% | - Parameter sets and environment variables - Stage usage and configuration - Sequential and parallel job creation - Data linking and partitioning |
| Job Execution, Monitoring and Troubleshooting | 15% | - Director client usage - Performance optimization - Job logs and error handling - Debugging and validation |
| Advanced Features and Integration | 10% | - Source control integration - Metadata management - Job sequences and control flow |
| Data Transformation and Processing | 25% | - Slowly Changing Dimensions (SCD) - Lookup and reference data - Transformer stage logic - Handling NULL values and data types |
IBM Assessment: InfoSphere DataStage v8.5 Sample Questions:
Which three actions can improve sort performance in a DataStage job? (Choose three.)
- A. Use the stable-sort option to avoid the random ordering of non-key data.
- B. Specify only the key columns which are necessary.
- C. Adjust the "Restrict Memory Usage" option in the Sort stage.
- D. Run the job sequentially so that only one sort process is invoked.
- E. Minimize the number of sorts used within a job flow.
Correct Answer: B,C,E 🗳️
Which statement is true about buffering?
- A. The framework uses /tmp by default for buffering on Unix systems.
- B. The "buffer" scratch disk pool needs to be defined to allow the framework to perform data buffering.
- C. In a clustered environment, using a disk space on an NFS mount for buffering improves performance.
- D. The buffer operator uses both memory and disk storage.
Correct Answer: D 🗳️
When using Runtime Column Propagation, which three stages require a schema file? (Select three)
- A. DB2 Enterprise stage
- B. File Set stage
- C. Sequential File stage
- D. Peek stage
- E. Column Import stage
Correct Answer: B,C,E 🗳️
Explanation: Only visible for 2Pass4sure members. You can sign-up / login (it's free).
A job needs to split a single Data Set into three Data Sets based on conditions that are supplied at runtime. Which stage would allow you to parameterize the conditions for splitting the input data set?
- A. Switch stage
- B. Filter stage
- C. Split Vector stage
- D. Transformer stage
Correct Answer: B 🗳️
A customer is complaining of poor performance from the job shown in the exhibit, which aggregates and joins on ZIP code. Currently all partitioning is set to "Auto" and sort/partition insertion is allowed.
What would give the best performance improvement for the job?
- A. Use same partitioning on all input links in the job; create the input data set by hash-partitioning its input on ZIP code.
- B. Hash partition and sort on ZIP code prior to the Copy stage, and use same partitioning on the Aggregator and Join stages.
- C. Hash partition and sort on ZIP code on the input links to the Aggregator and Join stages.
- D. Hash partition and sort on ZIP code prior to the Copy stage and use entire partitioning on the output of the Aggregator stage.
Correct Answer: B 🗳️
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