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IBM Websphere Datastage V.8.0 Sample Questions:

1. Which feature does the Merge stage have that is not available in the Join and Lookup stages?

A) Input data may be unsorted.
B) No more than one reject link may be specified.
C) All inputs must be sorted.
D) Several reject links may be specified.

2. You are experiencing performance issues for a given job. You are assigned the task of understanding what is happening at run time for the given job. What are the first two steps you should take to understand the job performance issues (Choose two.)

A) Run job with $APT_DUMP_SCORE set to true.
B) Run job with $APT_TRACE_RUN set to true.
C) Review the objectives of the job.
D) Remove complex stages and run the newer test version of the job to examine run-time statistics.

3. You are given a source file that was created by a COBOL program on z/OS. The corresponding COBOL copybook has hierarchical relationships on multiple levels. Which scenario would properly de-normalize the data into a single tabular output with best performance with a 4-node configuration file?

A) Use the Complex Flat File stage, setting the "Read from Multiple Nodes" property.
B) Define the output of a Complex Flat File stage as a single column, pass to the Column Import stage running in parallel to parse the output into to multiple columns.
C) Use the Sequential File stage, setting "Number of Readers Per Node" property greater than one, pass to Split Vector stage running parallel.
D) Use the External Source stage, running in parallel, to invoke a COBOL program to parse the source file.

4. Which three statements are true about Transformer stage variables? (Choose three.)

A) A stage variable derivation can be used to change a job parameter.
B) A stage variable can be assigned values by derivations.
C) A stage variable can evaluate to a null result.
D) A stage variable derivation can use other stage variables.
E) A stage variable can be used in derivations.

5. When tuning a parallel process, it is necessary to measure the amount of system resources that are used by each instance of a stage. Which two methods enable the collection of CPU time used by each instance of a stage? (Choose two.)

A) Set the environment variable $APT_PM_PLAYER_TIMING=true.
B) Set the environment variable $DS_MAKE_JOB_REPORT=2.
C) Select the Record job performance data check box from Job Properties.
D) Invoke vmstat before the job run and after the job completes.

Solutions: