想在正式上場前先感受真實考試的節奏嗎？Fast2test 的 000-421 桌面測試引擎完整模擬 IBM InfoSphere DataStage v8.5 的考試環境，搭配 2026 年持續更新的題庫，讓每一次模考都更接近實戰。

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IBM InfoSphere DataStage v8.5 考生常見問題解答

最新的 IBM Specialist 000-421 免費考試真題：

問題 #1

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. Insert sort stage between Join_1 and Join_2, subsort ("Don't sort, previously sorted") on "account", sort "hdr_number" and "paid_date".
B. 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".
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".

問題 #2

There is a requirement to load mainframe data with array columns having redefined fields into a flat file. How can the Complex Flat File

A. CFF does not support flattening for redefined fields.
B. Within CFF, use the Complex File Load Option window with "Flatten all arrays" option selected. CFF will handle flattening automatically.
C. Select the Records ID tab on the Stage page. Select a record from the Records list. Select the column(s) with the redefine from the Column list. Within CFF, use the Complex File Load Option window with "Flatten selective arrays" option selected.
D. Within CFF, use the Complex File Load Option window with "Flatten selective arrays" option selected. Select the array with redefine column(s) and click redefine check box option.

問題 #3

What two features enable a job with a Sequential File stage to read from sequential files with different numbers of columns and types? (Select two)

A. Runtime Column Propagation
B. Vector data type
C. Schema File property
D. Subrecord data type

問題 #4

Click the Exhibit button.

The job in the exhibit runs to successful completion with no warnings. However, a validation test identifies that the CUSTOMER_MASTER table is empty. You suspect the cause to be related to the NEW_CUSTOMERS table or a defect in the job. Examining runtime meta-data will help you track down the problem. Which two product features will help you isolate the cause of the problem? (Choose two.)

A. Show Performance Statistics in the Designer.
B. Use job run operational meta-data reports from IS Manager.
C. Job Monitor Tool in the Director Client
D. $APT_PM_PLAYER_STATS

問題 #5

Which statement is true about buffering?

A. The framework uses /tmp by default for buffering on Unix systems.
B. The buffer operator uses both memory and disk storage.
C. The "buffer" scratch disk pool needs to be defined to allow the framework to perform data buffering.
D. In a clustered environment, using a disk space on an NFS mount for buffering improves performance.

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