IBM A2090-421 : Assessment: InfoSphere DataStage v8.5

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

2. In the exhibit, a Funnel stage has two input links. Input 1 (Seq_File) comes from a SequentialFile with "Readers per Node" set to "2". Input 2 (Dataset) comes from a dataset created with 3 partitions. With the Funnel stage, the funnel type is set to "Sequence". The parallel configuration file contains three nodes.

How many instances of the Funnel stage run in parallel?

A) 1
B) 2
C) 6
D) 3

3. The number of File Set data files created depends upon what three items? (Choose three.)

A) Number of processing nodes in the default node pool.
B) File system limitations.
C) Number of physical processing nodes.
D) Schema definition of the file.
E) Number of disks in the export or default disk pool connected to each processing node in the default node pool

4. Which three actions can improve sort performance in a DataStage job? (Choose three.)

A) Run the job sequentially so that only one sort process is invoked.
B) Minimize the number of sorts used within a job flow.
C) Use the stable-sort option to avoid the random ordering of non-key data.
D) Specify only the key columns which are necessary.
E) Adjust the "Restrict Memory Usage" option in the Sort stage.

5. The Teradata Enterprise stage uses a distributed FastExport to access data. What is a limitation to distributed FastExport?

A) Aggregates and most arithmetic operators in the SELECT statement are allowed.
B) Non-data access (e.g., pseudo-tables like DATE or USER) is allowed.
C) The use of the USING modifier is allowed.
D) Multiple-AMP requests are allowed.

Solutions: