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IBM C2090-421 Exam Syllabus Topics:

IBM InfoSphere DataStage v8.5 Sample Questions:

1. In the exhibit, the Aggregator stage aggregates over CustomerID. The Join stage joins by CustomerID. When the score is created, DataStage will insert hash partitioners and tsort operators to ensure the correct results.

Which two choices will eliminate sort operators from being inserted at run-time? (Select two)

A) Add Sort stages in front of the Join stage and specify the Same partitioner for the links going into the Join. Set the $APT_NO_SORT_INSERTION environment variable to "True".
B) Add a Sort stage before the Copy stage and specify Auto partitioned for the links going into the Aggregator and Join stages.
C) Add a Sort stage before the Copy stage and specify Same partitioners for the links going into the Aggregator and Join stages.
D) Add a Sort stage before the Aggregator stage and specify the Same partitioner for the link going into the Aggregator Set the $APT_SORTJNSERTION_CHECK_ONLY environment variable to "True".

2. A 100MB input dataset has even distribution across 400 unique key values.
When run with a 4-node configuration file, which two changes could improve sort performance in this scenario? (Select two)

A) Set $APT_TSORT_STRESS_BLOCKSIZE to 50M
B) Specify "Restrict Memory Usage" to 60MB on the Sort stage properties.
C) Specify Round Robin partitioning on the input link to the Sort stage.
D) Convert all numeric fields to varchars.
E) Alter the Sort stage properties to perform a stable sort.

3. Click on the Exhibit button.

Provided you have enough system resources, what is the maximum number of jobs that could be running concurrently in this image?

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

4. Which three of the following are valid options for the dsjob command? (Choose three.)

A) Accessing log files
B) Compiling a job
C) Setting an alias for a job
D) Purging log files
E) Stopping a job

5. The derivation for a stage variable is: Upcase(input_column1) : ' ' : Upcase(input_column2). Suppose that input_column1 contains a NULL value. Which behavior is expected?

A) NULL is written to the target stage variable.
B) The target stage variable is populated with spaces or zeros depending on the stage variable data type.
C) The input row is either dropped or rejected depending on whether the Transformer has a reject link.
D) The job aborts.

Solutions: