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IBM InfoSphere DataStage v8.5 Sample Questions:

1. 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) Using custom SQL with AVG functions and a DISTINCT clause, select all source rows using a DB2 Enterprise stage.
C) 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.
D) Select all source rows using a DB2 API stage. Aggregate using a Sort Aggregator.

2. How are Host Systems added to the Shared Metadata repository? (Select two)

A) Select Repository > Metadata Sharing > Management from the main menu to open the Shared Metadata Management tool
B) Use the shared table creation wizard from the DataStage client to add a new Host System.
C) Use the Import/Export Manager when importing shared metadata.
D) Use the DataStage Administrator application to import new Host Systems.

3. In the exhibit, the Aggregator stage aggregates over CustomerID. The Join stage joins by CustomerID. When the score is created, DataStage will insert hash partitioners and tsort operators to ensure the correct results.

Which two choices will eliminate sort operators from being inserted at run-time? (Select two)

A) Add Sort stages in front of the Join stage and specify the Same partitioner for the links going into the Join. Set the $APT_NO_SORT_INSERTION environment variable to "True".
B) Add a Sort stage before the Copy stage and specify Auto partitioned for the links going into the Aggregator and Join stages.
C) Add a Sort stage before the Copy stage and specify Same partitioners for the links going into the Aggregator and Join stages.
D) Add a Sort stage before the Aggregator stage and specify the Same partitioner for the link going into the Aggregator Set the $APT_SORTJNSERTION_CHECK_ONLY environment variable to "True".

4. You are asked by management to document all jobs written to make future maintenance easier. Which two statements are true about annotations? (Choose two.)

A) The full job description can be identified within the Description Annotation stage.
B) The Description Annotation stage contains both the short and full descriptions for the job.
C) The Description Annotation stage can be added several times at different locations to identify business logic.
D) The background for the Description Annotation stage can be changed for each unique stage.

5. 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) Use Round Robin partitioning on the stream and Entire partitioning on the reference.
B) Replace the Join with a Merge stage.
C) Alter the number of partitions in the $APT_CONFIG_FILE.
D) Break the input file into multiple files.

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