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 ?
* 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?
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.