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IBM InfoSphere DataStage v8.5 Sample Questions:

1. The given job processes large volumes of data using default partitioning, with sort/partition insertion enabled. Both source Data Sets are partitioned and sorted on the merge key. Assuming that the business logic allows all of the following actions, which design change would improve the performance of this job?

A) Set the "Preserve Partitioning" option on both Data Sets and replace the Merge stage with a Sort Funnel stage.
B) Use the Data Set Management Utility to combine both input Data Sets into a single source Data Set.
C) Before each input to the Merge stage, insert a Sort stage with "Don't Group, Previously Grouped" set on the merge key. Specify SAME partitioning on all inputs.
D) Set the buffer mode to "no buffer" on the output links of both Data Sets.

2. 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 retain their values between rows in the stage.
D) A derivation for a stage variable can reference stage variables that are later in the execution order.
E) Stage variables are executed after constraints but before derivations.

3. DataStage offers database connectivity through connectors, native parallel and plug-in stage types. Which two statements are correct? (Choose two.)

A) Next to the connector stage it is best to use the native parallel database stages.
B) ODBC API is a plug-in stage.
C) For maximum parallel performance, scalability, and features it is best to use the native parallel database stages.
D) The connector stage offers better functionality and performance and is the best to use.

4. What is the correct restructure stage to extract data from four input columns (three of which carry vectors) and output them into two columns with one vectors in a subrecord and the non-vector carrying column being passed through the stage?

A) Make Subrecord Stage
B) Column Export Stage
C) Split Subrecord Stage
D) Column Import Stage

5. You have a parallel shared container that is used by other parallel jobs within your project. Part of the logic in this shared container has been changed. Which two statements are true regarding this change to the parallel shared container? (Choose two.)

A) You can create a sequencer to re-compile all of the routines using this shared container.
B) Use usage analysis and multi-compile to re-compile job using this shared container.
C) Jobs using this parallel shared container need to be re-compiled.
D) Jobs using this parallel shared container need to be re-compiled only when the metadata of the container is changed.

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