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IBM C2090-421 Exam Syllabus Topics:

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

2. You are setting up user roles on Information Server Web console. Which two roles are required to allow a user to edit DataStage jobs? (Select two)

A) Information Analyzer Data Administrator
B) DataStage Developer
C) Suite User role
D) DataStage super operator

3. Configuring the weighting column of an Aggregator stage affects which three options. (Choose three.)

A) Corrected Sum of Squares
B) Sum of Weights
C) Percent Coefficient of Variation
D) Maximum Value
E) Sum

4. Which three actions can improve sort performance in a DataStage job? (Choose three.)

A) Minimize the number of sorts used within a job flow.
B) Adjust the "Restrict Memory Usage" option in the Sort stage.
C) Run the job sequentially so that only one sort process is invoked.
D) Use the stable-sort option to avoid the random ordering of non-key data.
E) Specify only the key columns which are necessary.

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

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