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IBM C2090-421 : InfoSphere DataStage v8.5
Exam Code: C2090-421
Exam Name: InfoSphere DataStage v8.5
Updated: Sep 11, 2026
Q & A: 194 Questions and Answers
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IBM C2090-421 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Job Design and Development | - Transformations and stages usage - Data flow and job sequencing - Designing DataStage jobs |
| Topic 2: Performance Tuning and Optimization | - Partitioning and parallelism strategies - Parallel job optimization techniques |
| Topic 3: Debugging and Administration | - Logging and error handling - Job monitoring and troubleshooting |
| Topic 4: Connectivity and Data Sources | - Database connectors and stages - File handling (sequential and complex files) |
| Topic 5: DataStage Architecture and Concepts | - Parallel processing architecture - InfoSphere DataStage components - Server vs parallel jobs overview |
IBM InfoSphere DataStage v8.5 Sample Questions:
Question #1
You are given a job requirement that requires calculations based on the latest currency exchange rate. You decide to invoke a Web service to obtain the latest exchange rate.
What are two ways that you can perform a Web service invocation in a DataStage job to obtain the latest exchange rate? (Select two)
- A. Call a Web Service using a DSRoutine inside the Parallel Transformer stage.
- B. Use WISD Input stage.
- C. Use Web Services Client stage as a lookup.
- D. Use Web Services Transformer stage.
Answer: C,D
Question #2
You have a dataset hash-partitioned and sorted on CustID. You need to create a Sequential File sorted on CustID from this dataset. Which technique is the most appropriate?
- A. Use Copy stage.
- B. Insert Sort stage before the final Sequential File stage and use Round Robin collector for the Sequential File stage input link.
- C. Use SortMerge collector for the Sequential File input link.
- D. Insert Sort stage before the final Sequential File stage and use Ordered collector for the Sequential File stage input link.
Answer: C
Question #3
Using a DB2 for z/OS source database, a 200 million row source table with 30 million distinct values must be aggregated to calculate the average value of two column attributes. What would provide optimal performance while satisfying the business requirements?
- A. Select all source rows using a DB2 Enterprise stage, use a parallel Sort stage with the specified sort keys, calculate the average values using a parallel Transformer with stage variables and output link constraints.
- B. Select all source rows using a DB2 API stage. Aggregate using a Sort Aggregator.
- C. Using custom SQL with AVG functions and a DISTINCT clause, select all source rows using a DB2 Enterprise stage.
- D. Using custom SQL with an ORDER BY clause based on key columns, select all source rows using the DB2 API stage. Aggregate using a Hash Aggregator.
Answer: B
Question #4
A customer must compare a date column with a job parameter date to determine which output links the row belongs on. What stage should be used for this requirement?
- A. Switch stage
- B. Transformer stage
- C. Filter stage
- D. Compare stage
Answer: B
Question #5
In a Transformer expression for a stage variable, there is a nullable input column. What happens when a row is processed that contains NULL in that input column?
- A. NULL is written to the stage variable.
- B. The row is rejected.
- C. The value written to the stage variable is undetermined.
- D. The job aborts.
Answer: A
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