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最新的 IBM Specialist 000-421 免費考試真題:

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) Alter the number of partitions in the $APT_CONFIG_FILE.
C) Break the input file into multiple files.
D) Use Round Robin partitioning on the stream and Entire partitioning on the reference.

2. Which two statements are true about the use of named node pools? (Choose two.)

A) Named node pools can allow separation of buffering from sorting disks.
B) Using appropriately named node pools forces DataStage to use named pipes between stages.
C) Named node pools constraints will limit stages to be executed only on the nodes defined in the node pools.
D) Clustered environments must have named node pools for data processing.

3. Your job runs slowly and does not scale beyond two nodes. It appears the data has been partitioned on the DoNotCall flag, which has accumulating totals based on this flag using a sort method.
Which technique would improve scalability and performance?

A) Change the preserve partitioning option on the stage ahead of the aggregator to clear partitioning.
B) Increase the number of physical nodes available for partitioning.
C) Change the partitioning method to Round Robin; add a second Aggregator stage with Execution mode 'Sequential' and
D) Add an additional column for partitioning to result in additional data partitions.

4. Refer to the exhibit.

You are responsible for improving performance for a given job. From reviewing the job dump score, you notice that many tsort operators are inserted. Join_1 is on columns "account", "po_date" and "hdr_number". Join_2 is based on "account", "hdr_number", "paid_date".
Which two actions will help you improve the performance without changing the business logic?
(Select two)

A) Partition on account and hdr_numberfor all joins. Change Join_1 to join on "account", "hdr_number" and "po_date". Insert Sort between Join_1 and Join_2 and subsort ("Don't sort previously sorted") on "account".
B) Insert sort stage between Join_1 and Join_2, subsort ("Don't sort, previously sorted") on "account", sort "hdr_number" and "paid_date".
C) Partition on account and hdrnumber for all joins. Change Join_1 to join on "account", "hdrnumber" and "po_date". Insert Sort between Join_1 and Join_2 and subsort ("Don't sort previously sorted") on "account" and "hdr_number" and sort on "paid_date".
D) Partition on "account" and "hdr_number" for all joins. Change Join_1 to join on "account", "hdr_number" and "po_date". Add Add $APT_SORTJNSERTION_CHECK_ONLY to job parameter list and set it to "True".

5. You are asked to convert a relational source, as shown in the exhibit, into three separate XML files. How would you accomplish this task?

A) Set "Output mode" setting "Break" on column "Customer ID" under "Transformation Settings" of the Output link of an XML Output stage.
B) Set "Output mode" setting" Split rows" under "Transformation Settings" of the Output link of an XML Output stage.
C) Set "Output mode" setting "Segregate" on column "Customer ID" under "Transformation Settings" of the Output link of an XML Output stage.
D) Set "Output mode" setting "Single row" under "Transformation Settings" of the Output link of an XML Output stage.

問題與答案：