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

2. Configuring the weighting column of an Aggregator stage affects which three options. (Choose three.)

A) Percent Coefficient of Variation
B) Sum
C) Sum of Weights
D) Maximum Value
E) Corrected Sum of Squares

3. You are processing groups of rows in a Transformer. The first row in each group contains "1" in the Flag column and "0" in the remaining rows of the group. At the end of each group you want to sum and output the QTY column values. Which three techniques will enable you to retrieve the sum of the last group? (Choose three.)

A) Output the sum that you generated up to the previous row each time you process a row with a "1" in the Flag column. Use the LastRow() function to determine when the last group is done.
B) Output the sum that you generated each time you process a row for which the LastRow() function returns True.
C) Output a running total for each group for each row. Follow the Transformer stage by an Aggregator stage. Take the MAX of the QTY column for each group.
D) Within each group sort the Flag column in ascending order. Output the sum each time you process the row with a "1" in the Flag column.
E) Output the sum that you generated up to the previous row each time you process a row with a "1" in the Flag column.

4. In a Transformer, which two of the following mappings can be handled by default type conversions. (Select two)

A) Date input column mapped to a string output column.
B) String input column mapped to integer output column.
C) Integer input column mapped to string output column.
D) Integer input column mapped to raw output column.
E) String input column mapped to a data output column.

5. What are two advantages of using Runtime Column Propagation (RCP)? (Choose two.)

A) Sequential files don't require schema files when using RCP.
B) Columns not specifically used in the flow are propagated as if they were.
C) Only columns that are defined as VarChar need RCP enabled.
D) Only columns used in the data flow need to be defined.
E) RCP is not a feature of DataStage.

Solutions: