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IBM InfoSphere DataStage v8.5 Sample Questions:

1. You have a DataStage job on SMP environment. It contains an input sequential file, a Modify stage, followed by a Transformer stage, and an output Sequential File stage. The job is run with three nodes. The engine uses all default settings. How many processes will this job create?

A) 19
B) 16
C) 12
D) 9

2. Which two statements are true about the usage of scratch disk? (Choose two.)

A) The Sort stage always uses the scratch disk.
B) If "buffer" scratch disk pool is defined, the framework uses this disk pool and the default disk pool.
C) The parallel framework uses the disk space specified in the scratch disk setting to buffer virtual data set records.
D) You can define multiple scratch disk spaces to distribute disk I/O.

3. Your job runs slowly and does not scale beyond two nodes. It appears the data has been partitioned on the DoNotCall flag, which has accumulating totals based on this flag using a sort method.
Which technique would improve scalability and performance?

A) Change the partitioning method to Round Robin; add a second Aggregator stage with Execution mode 'Sequential' and
B) Change the preserve partitioning option on the stage ahead of the aggregator to clear partitioning.
C) Add an additional column for partitioning to result in additional data partitions.
D) Increase the number of physical nodes available for partitioning.

4. In the job fragment shown in the exhibit, there are two Sort stages: the first (Sort1) sorts the data by state, the second (Sort2) sorts the data by state and area, No repartitioning occurs between the stages.
You have been asked to reduce the number of sorts to improve the performance of the job.

Which two ways might be used to accomplish this without changing how the job functions? (Select two)

A) Remove the second Sort stage. Add area as an additional sort key.
B) In the second Sort stage change the Sort Mode property of the area column to "Don't sort, previously sorted.".
C) Remove the first Sort stage. Retain the existing sort keys in the second Sort stage.
D) In the second Sort stage change the Sort Mode property of the state column to "Don't sort, previously sorted.".

5. 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 aggregation is a custom formula for your enterprise.
B) A global aggregation across all partitions is needed.
C) The data hasn't been sorted or grouped.
D) Aggregation results outside of a certain range need to be flagged as abnormal.

Solutions: