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Last Updated: Sep 14, 2026
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IBM C2090-421 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Performance Tuning and Optimization | - Parallel job optimization techniques - Partitioning and parallelism strategies |
| Topic 2: Connectivity and Data Sources | - File handling (sequential and complex files) - Database connectors and stages |
| Topic 3: Debugging and Administration | - Logging and error handling - Job monitoring and troubleshooting |
| Topic 4: Job Design and Development | - Designing DataStage jobs - Transformations and stages usage - Data flow and job sequencing |
| Topic 5: DataStage Architecture and Concepts | - InfoSphere DataStage components - Parallel processing architecture - Server vs parallel jobs overview |
IBM InfoSphere DataStage v8.5 Sample Questions:
Which three of the following are valid schema formats? (Choose three.)
- A. Integer Columns
- B. Raw Columns
- C. Total Columns
- D. Decimal Columns
- E. Aggregator Columns
Correct Answer: A,B,D 🗳️
Which three statements are true about stage variables? (Select three)
- A. Stage variables cannot contain NULL values.
- B. Stage variables are executed before loop variables.
- C. Stage variables are executed after constraints but before derivations.
- D. Stage variables retain their values between rows in the stage.
- E. A derivation for a stage variable can reference stage variables that are later in the execution order.
Correct Answer: A,D,E 🗳️
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A job validates credit card numbers with a reference file using a Join stage, which is hash partitioned by card number. Examination of Job Monitor reveals that some partitions process many more rows than others. Assuming adequate hardware resources, which action can be used to improve the performance of the job?
- A. Break the input file into multiple files.
- B. Replace the Join with a Merge stage.
- C. Alter the number of partitions in the $APT_CONFIG_FILE.
- D. Use Round Robin partitioning on the stream and Entire partitioning on the reference.
Correct Answer: C 🗳️
Records in a source file must be aggregated for further processing. Which two conditions would require the use of a Transformer stage instead of or in addition to an Aggregator stage? (Choose two.)
- A. The data hasn't been sorted or grouped.
- B. Aggregation results outside of a certain range need to be flagged as abnormal.
- C. A global aggregation across all partitions is needed.
- D. The aggregation is a custom formula for your enterprise.
Correct Answer: B,D 🗳️
Which two of the following derivations for an output column named OutCol can be used to generate a unique sequence of integers across multiple partitions?
- A. NextSurrogateKey()
- B. 1 + @NUMPARTITIONS * @INROWNUM
- C. @INROWNUM
- D. @PARTITIONNUM + @NUMPARTITIONS
Correct Answer: D 🗳️
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