IBM 000-421 Actual Free Exam Questions & Community Discussion

Exam Code/Number: 000-421
Exam Name/Title: InfoSphere DataStage v8.5
Certification Provider: IBM
Corresponding Certification: IBM Specialist

Exam Questions: 194
Updated On: May 26, 2026

Question #13

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_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".

B. 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".

C. 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".

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

Discussion 0

Correct Answer: A,B Vote an answer

Question #14

In your DB2 database you have column names that use characters # and $. Which two steps should be completed to allow DataStage to convert these characters into internal format and back as necessary? (Select two)

A. Avoid using the strings_025_and_026_in your IBM DB2 column names.

B. Avoid using the strings_035_and_036_in your IBM DB2 column names.

C. Set environment variable $DS_ENABLE_RESERVED_NUM_CONVERT to true.

D. Set environment variable $DS_ENABLE_RESERVED_CHAR_CONVERT to true.

Discussion 0

Correct Answer: B,D Vote an answer

Question #15

A customer requires reading a fixed-length sequential file in parallel where input rows can be identified. What two tasks must be done to meet these requirements? (Choose two.)

A. Ensure data has unique identifiers for data rows.

B. Specify Multiple readers per node.

C. Set partitioning method to Same.

D. Set $APT_READ_MULTI_NODES to TRUE.

Discussion 0

Correct Answer: A,B Vote an answer

Question #16

You are about to begin major changes to jobs in a project. You want to conveniently identify job changes on an ad hoc basis. What two tasks will allow you to identify changes to your jobs? (Choose two.)

A. Import the original job from a .dsx export.

B. Before making a change to a job make a copy of the job in a different category folder.

C. Select the job, then right click Cross Project Compare.

D. Select the job, then right click Compare within.

Discussion 0

Correct Answer: B,D Vote an answer

Question #17

Which three statements are true about stage variables? (Select three)

A. A derivation for a stage variable can reference stage variables that are later in the execution order.

B. Stage variables cannot contain NULL values.

C. Stage variables retain their values between rows in the stage.

D. Stage variables are executed before loop variables.

E. Stage variables are executed after constraints but before derivations.

Discussion 0

Correct Answer: A,B,C Vote an answer

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Question #18

Which two statements are true about the usage of scratch disk? (Choose two.)

A. The Sort stage always uses the scratch disk.

B. You can define multiple scratch disk spaces to distribute disk I/O.

C. The parallel framework uses the disk space specified in the scratch disk setting to buffer virtual data set records.

D. If "buffer" scratch disk pool is defined, the framework uses this disk pool and the default disk pool.

Discussion 0

Correct Answer: B,C Vote an answer

Question #19

Which two partitioning methods require keys? (Choose two.)

A. Entire

B. Round Robin

C. Hash

D. Modulus

Discussion 0

Correct Answer: C,D Vote an answer

Question #20

Which two statements are true regarding access to a MQ queue? (Choose two.)

A. MQ plugin stage can be used to read and write messages from a remote MQ message queue.

B. MQ connector stage is capable of connecting to Queue manager in both Server and Client mode.

C. MQ stage connects to a queue manager in Client mode only.

D. MQ stage and MQ connector stages support destructive reads.

Discussion 0

Correct Answer: B,D Vote an answer

Question #21

In a file defining a partial schema, which three properties define the record? (Choose three.)

A. record_length

B. delim

C. text

D. record_delim_string

E. intact

Discussion 0

Correct Answer: A,D,E Vote an answer

Question #22

Which of the following describes a type two update in a Slowly Changing Dimensions (SCD) stage?

A. An update the retains the existing column value in an historical row and creates a new row with the new value.

B. An update that retains the existing column value in a list and adds the new value to the list.

C. An update that overwrites the existing column value.

D. An update that replaces the existing column value if a specified condition is satisfied.

Discussion 0

Correct Answer: B Vote an answer

Question #23

In which two situations would you use the Web Services Client stage? (Choose two.)

A. You want to deploy a service.

B. You do not need both input and output links in a single web service operation.

C. You need to create a WSDL.

D. You need the Web service to act as either a data source or a data target during an operation.

Discussion 0

Correct Answer: B,D Vote an answer

Question #24

What would help debug the run-time environment?

A. $OSH_PRINT_SCHEMAS

B. Check the message filters for the job.

C. View detailed runtime stats through Job monitor in Director Client.

D. $APT_VERBOSE

Discussion 0

Correct Answer: A Vote an answer

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