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IBM Assessment: InfoSphere DataStage v8.5 Sample Questions:

1. A job validates credit card numbers with a reference file using a Join stage, which is hash partitioned by card number. Examination of Job Monitor reveals that some partitions process many more rows than others. Assuming adequate hardware resources, which action can be used to improve the performance of the job?

A) Replace the Join with a Merge stage.
B) Use Round Robin partitioning on the stream and Entire partitioning on the reference.
C) Break the input file into multiple files.
D) Alter the number of partitions in the $APT_CONFIG_FILE.

2. 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) Column Export Stage
B) Split Subrecord Stage
C) Make Subrecord Stage
D) Column Import Stage

3. A DataStage job uses an Inner Join to combine data from two source parallel datasets 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) Explicitly specify hash partitioning and sorting on each input to the Join stage.
B) Unset the Preserve Partitioning flag on the output of each parallel dataset.
C) Disable job monitoring.
D) Add a parallel sort stage before each Join input, specifying the "Don't Sort, Previously Grouped" sort key mode for each key.
E) Set the environment variable $APT_SORT_INSERTION_CHECK_ONLY.

4. In your DB2 database you have column names that use characters # and $. Which two steps should be completed to allow DataStage to convert these characters into internal format and back as necessary? (Select two)

A) Set environment variable $DS_ENABLE_RESERVED_CHAR_CONVERT to true.
B) Set environment variable $DS_ENABLE_RESERVED_NUM_CONVERT to true.
C) Avoid using the strings_035_and_036_in your IBM DB2 column names.
D) Avoid using the strings_025_and_026_in your IBM DB2 column names.

5. You are setting up project defaults. Which three items can be set in DataStage Administrator? (Choose three.)

A) default for compile options
B) defaults for environment variables
C) suite roles
D) default prompting options, such as Autosave job before compile
E) default for Runtime Column Propagation

Solutions: