AS400 Interview Questions.
Mainframe Interview Questions on AS400 asked in top companies.
What is arrival sequence?Answer : The records will be accessed the way in which records are added to physical file.
How many specifications are there in RPG/400? What are they?
Answer : There are seven specifications are exits in RPG/400. They are listed below:
* Header Specification ,* File Description specification ,* Extension specification
* Line counter specification ,* Input specification ,* Calculation specification ,* Output specification
When do you use F-spec. continuation line ?
Answer :
* In order to refer the named record format as a subfile record format in the program.
* In order to rename the record format of a database file in a program.
* In order to define a named data structure as a file information data structure.
What are the various types of device files?
Answer : Display files, printer files, discket files, tape files etc. ,
When do you explicitly open files and close files in an RPG program?
Answer : If you specify the letter ' U ' at column 73-74, you need to be open and close files explicitly in a RPG program.
How do you know that records are locked?
Answer : By using a command WRKOBJLCK.
What is the purpose of Indicators in RPG?
Answer : In order to control the logic flow, we can use indicators in RPG.
How do you read data area in an RPG program?
Answer : With the help of 'IN' opcode, we can access the data area record in to the program.
What are the different types of Data Areas?
Answer :
The different types of Data Areas are general data area, local data area, group data area, pip (program initialization parameter data area) data area.
*General Data Area - It can be created by user implicitely or explicitly
It can be referred by any other jobs.
It can be associated with a library.
It can be created, deleted by the user.
* Local Data Area - It can not be referred by any other job.
It is automatically created and deleted by the system.
It is not associated with any library.
*Group Data Area - It is automatically created and deleted by the system
We can access the group data area value through clp.
It is meant for group jobs.
*Pip Data Area - It is meant for pre start jobs.
What are various techniques to pass parameters from one program to another?
Answer : PLIST, CALL, TFRCTL
Which single RPG opcode performs both SETLL and READE?
Answer : CHAIN
What is term CUA , SAA?
Answer : Common User Access
System Application Architecture
Why is AS/400 called Object Oriented Machine?
Answer : Everything on the AS/400 System that can be stored and retrieved is contained in the object.
What is the version of OS/400 that we have?
Answer : V4R2 (Version 4. 0 Release 2. 0)
What is DDM ?
Answer : Distribution Data Management is a function of the OS/400 that allows an application program or user on one system to use database files stored on remote system.
What is an Object?
Answer : An object is any thing that exists in and occupies space in storage and on which operation can be performed.
How are the objects stored on AS/400?
Answer : All objects are stored on AS/400 in a single level storage. In this method all objects are referenced by one virtual address which is translated in to a physical address whether it is an auxiliary storage or main memory.
What is a Library in AS/400?
Answer : A library in AS/400 is an object that serve(acts) as a repository for other objects.
Name few IBM supplied libraries?
Answer : QGPL, QTEMP, QSYS, QUSRTOOL, QCBL, QRPG
What is library list ?
Answer : A list that indicates libraries used for the process and the order in which it has to be searched System identifies it in *LIBL.
How many libraries can be there in library list ?
Ans:Total 40 (15 system and 25 application)
What is Folder?
Answer : A Folder is a named object that is used as a directory for documents and other folders.
Folders can be filed with in another folder.
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