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IBM Websphere Datastage V.8.0 Sample Questions:

1. 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) NullToValue(input_column)
D) If input_column = then
E) NullToEmpty(input_column)

2. You are assigned to write a job that reads in a Sequential File, applies some business logic, and writes the results to a database. However, the layout of the input file will change from run to run. All of the columns will remain the same, but the order of the columns will change. Which feature of the Sequential File stage would allow you to accomplish this task?

A) Reject Mode
B) Filter
C) First Line Is Column Names
D) Schema File

3. A 100 MB input data set has even distribution across 400 unique key values. When run with a 4-node configuration file, which two changes could improve sort performance for this scenario? (Choose two.)

A) Alter the Sort stage properties to perform a Stable sort.
B) Specify "Restrict Memory Usage" to 60 MB on the Sort stage properties.
C) Set $APT_TSORT_STRESS_BLOCKSIZE to 50 MB.
D) Specify Round Robin partitioning on the input link to the Sort stage.

4. You need to update three dimension tables and one fact table in a star schema data warehouse using the Slowly Changing Dimensions (SCD) stage. How many SCD stages will you need in your jobs?

A) Two
B) Four
C) One
D) Three

5. What is the lowest cost partitioning method for parallel stage to sequential stage?

A) Entire
B) Round Robin
C) SortMerge
D) Ordered

Solutions: