Tag: mainframe

Questions Related to mainframe

What is the name of the area from character positions 73 to 80?
technology mainframe

  1. Area C

  2. Area AB

  3. Identification area

  4. Modification area

Show answer
Correct Option: C

What does a disposition of (MOD,KEEP,) mean?

technology mainframe

  1. Dataset is created if not available

  2. Dataset will deleted on abnormal termination

  3. Dataset will not be deleted on abnormal termination

  4. job will abend if the data is not available

Show answer
Correct Option: A,C
Explanation:

To understand what a disposition of (MOD,KEEP,) means, the user needs to know about dataset dispositions in mainframe systems.

A dataset disposition is a set of instructions that specifies what should happen to a dataset after a job completes. It can include options such as KEEP, CATLG, or DELETE, which determine whether a dataset should be retained or deleted and whether a catalog entry should be created.

In this case, the disposition of (MOD,KEEP,) means that the dataset should be opened for output in "modify" mode (MOD), which allows existing data to be updated or added to, and should be kept (KEEP) after the job completes, regardless of whether the job ends normally or abnormally.

Now, let's review each option and determine which one is correct:

A. Dataset is created if not available: This option is incorrect because the disposition of (MOD,KEEP,) assumes that the dataset already exists and is being modified. It does not involve creating a new dataset.

B. Dataset will deleted on abnormal termination: This option is incorrect because the disposition of (MOD,KEEP,) explicitly specifies that the dataset should be kept regardless of whether the job ends normally or abnormally.

C. Dataset will not be deleted on abnormal termination: This option is correct. The disposition of (MOD,KEEP,) specifies that the dataset should be kept after the job completes, even if the job ends abnormally.

D. job will abend if the data is not available: This option is incorrect because the disposition of (MOD,KEEP,) assumes that the dataset already exists and is being modified. It does not involve checking for the availability of the dataset.

Therefore, the correct answer is:

The Answer is: C. Dataset will not be deleted on abnormal termination.

Temporary datasets are created by

technology mainframe

  1. DSN=*

  2. DSN=##TEMP

  3. DSN=&&TEMP

  4. By not specifying any DSNAME

Show answer
Correct Option: C,D

What is COND=EVEN ?
technology mainframe

  1. Execute next step even if the current step terminates abnormally.

  2. Execute this step even if any of the previous steps, terminated abnormally.

  3. Execute next step even if the current step terminates normally.

  4. Execute this step even if any of the previous steps, terminated normally.

Show answer
Correct Option: B

What is COND=ONLY ?
technology mainframe

  1. Execute this step only if any of the previous steps terminates normally

  2. Execute this step only if any of the previous steps terminates abnormally

  3. Execute next step only this step terminates abnormally

  4. Execute next step only this step terminates normally

Show answer
Correct Option: B

What happens if both JOBLIB & STEPLIB is specified ?

technology mainframe

  1. STEPLIB will be ignored

  2. JOBLIB will be ignored

  3. Both are referred

  4. JOBLIB overrides the STEPLIB

Show answer
Correct Option: B

The DISP in the JCL is MOD, the dataset is already available and the program opens the file in OUTPUT mode. What happens ?
technology mainframe

  1. Records will be appended at the end

  2. Records will be overwritten

  3. Dataset will be deleted and records will be written by creating a new file

  4. Job will abend

Show answer
Correct Option: A

Maximum number of steps in a job

technology mainframe

  1. 16

  2. 255

  3. 256

  4. No limit

Show answer
Correct Option: B

AI Explanation

To answer this question, we need to understand the concept of the maximum number of steps in a job.

In computing, a "job" refers to a task or a program that is being executed by a computer system. Each job can be divided into a series of steps or instructions that the computer follows to complete the task. The maximum number of steps in a job is determined by the computer system's architecture and limitations.

Now let's go through each option to understand why it is correct or incorrect:

Option A) 16 - This option is incorrect because 16 is a relatively low number and may not be sufficient for many complex tasks.

Option B) 255 - This option is correct because 255 represents the maximum value that can be stored in an 8-bit binary number (2^8 - 1). In some computer systems, the maximum number of steps in a job is limited to 255 instructions.

Option C) 256 - This option is incorrect because 256 exceeds the maximum value that can be stored in an 8-bit binary number. Additionally, having 256 steps in a job would require a larger memory capacity and may not be supported by all computer systems.

Option D) No limit - This option is incorrect because there is typically a limit to the number of steps in a job. Computer systems have finite resources and limitations that restrict the maximum number of instructions that can be executed in a single job.

The correct answer is B) 255. This option is correct because it represents the maximum number of steps that can be executed in a job in some computer systems.

Which of the following DB2 data types CANNOT be used to contain the date an employee was hired?

technology mainframe

  1. TIMESTAMP

  2. VARCHAR

  3. TIME

  4. CLOB

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Correct Option: C

Which of the following is defined on the dependent table to implement a referential constraint?

technology mainframe

  1. Primary Key

  2. Check constraint

  3. Foreign Key

  4. Update trigger

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Correct Option: C