Application System 400 (AS400): Q&A
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What
does ‘AS’ and '400' in AS400 stands for?
Application system. The '400' digits denotes
the successor figure of System 36 and System 38. In other words we can say, the
System/36 to System/38 has been upgraded to new level and named as Application
System/400.What is library is AS400 and how many types of library?
Once a a command executed or a program get called, the AS/400 must know where to find the command or program and the answer is library. A Library is a collection of objects. QSYS is the only library that contains other library. QSYS is the root library where the entire user defined/ system defined library is created. All system supplied libraries begin with the letter "Q" or "#".
Followings are the types of Library List:
System
library: All IBM supplied library e.g. QSYS, QHLPSYS,
QUSRSYS…
Product Library: Product is used it is added to the library automatically and is
removed itself when the job completes.
Current
Library: Current library is the working library i.e. all
the work done by you is stored in current library.
User
Library: Non-IBM supplied i.e. created by the user.
Which library gets loaded first into the system once a user logged in?
QSYS
How can we see all the objects and its sizes in a library
