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IBM Websphere Datastage V.8.0 Sample Questions:

1. A credit card company has about 10 million unique accounts. The company needs to determine the outstanding balance of each account (Account_id) by aggregating the previous balance with current charges. A multi-node DataStage job with an Aggregator stage is being used to perform this calculation. Which three tasks are required for optimal performance? (Choose three.)

A) Use "Sort" Aggregator method.
B) Use "Hash" partition on Account_id going into the Aggregator stage.
C) Use "Hash" Aggregator method.
D) Use "Round Robin" partition on Account_id for even distribution of records.
E) Sort data on Account_id going into the Aggregator stage.

2. A DataStage job uses an Inner Join to combine data from two source parallel data sets that were written to disk in sort order based on the join key columns. Which two methods could be used to dramatically improve performance of this job? (Choose two.)

A) Unset the Preserve Partitioning flag on the output of each parallel data set.
B) Set the environment variable $APT_SORT_INSERTION_CHECK_ONLY.
C) Explicitly specify hash partitioning and sorting on each input to the Join stage.
D) Add a parallel sort stage before each Join input, specifying the "Don't Sort, Previously Grouped" sort key mode for each key.

3. Click the Exhibit button.
In the exhibit, each Job Activity runs a single parallel job. Sequencer1 is configured for All, while Sequencer5 is configured for Any. Assuming that the server hardware has enough system resources to execute all jobs simultaneously, what is the maximum number of jobs that could be running simultaneously?

A) 2
B) 3
C) 5
D) 4

4. Which two job design techniques can be used to provide unique names to sequential output files that are used in multi-instance jobs? (Choose two.)

A) Create the file name(s) from values contained in a value file.
B) Create the file name(s) from values contained in the data stream.
C) Use parameters to identify file names.
D) Prepend/append the Invocation Id to the file name.

5. The Change Apply stage produces a change Data Set with a new column representing the code for the type of change. What are three change values identified by these code values? (Choose three.)

A) Final
B) Copy
C) Deleted
D) Remove Duplicates
E) Edit

Solutions: