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IBM Websphere Datastage V.8.0 Sample Questions:

1. In a job using Sequential File stage to write a sequential file, the ContactName column is nullable, but the "Null field value" property is left unspecified. The ContactName column has a Char(50) data type. What will happen if NULL is written to the ContactName column?

A) The row containing the NULL will be rejected.
B) The empty string ("") will be written to the ContactName column.
C) The column will be padded with the character specified by the $APT_STRING_PADCHAR character.
D) The job will abort.

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

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

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

4. You have a nullable input column that can be mapped to a non-nullable output column.
Which three NULL handling techniques can be used in the Transformer stage for that column? (Choose three.)

A) If input_column = NULL then
B) If IsNull(input_column) then
C) If input_column = then
D) NullToEmpty(input_column)
E) NullToValue(input_column)

5. Click the Exhibit button.
A parallel job is designed to Join data from two existing persisted data sets that were created in sort order using the join keys. You have optimized the job to leverage the existing sort order instead of resorting. Using the job score fragment shown in the exhibit for this job, how would you verify that this job is optimizing the sort operation?

A) This cannot be verified from the job score. You must set the environment variable $DS_PX_DEBUG and verify the captured files.
B) The subargs property indicates that the sort is only checking sort order.
C) The job is not optimized; there are inserted tsort operators.
D) The job is not optimized because the sort is inserted after the RemDup operator.

Solutions: