As400 Bascis

                                         About AS400

•AS400 is a family of mid-range computers based on a single s/w architecture.

•The O.S used in AS400 is OS-400.

•It mainly facilitates the relation b/w database and user.

•The user communicates with an AS400 server using a single CONTROL LAUNGUAGE or by using system menus and prompts. 

• CONTROL LAUNGUAGE is nothing but command used to execute or to get our request done.

                                                ADVANTAGES OF AS400

       •LAYERD MACHINE ARCHITECTURE: The as400 architecture is in form of layers. So, it enables user to move or change or upgrade to new hardware when he is in need.

• OBJECT ORIENTATION: Every thing that we save in AS400 system is saved in form of object. User can find the required object by using its name even though if he do not the location he saved the object.

• Single level storage: every object saved in AS400 system is not independent on the addressing mechanism. Where the space is available the object is stored and bcz of that wastage of memory is low.

• Hierarchy of microprocessor: Every input and output device has its own micro processor. This means that request for data read or write can be delegated to any micro processor and to any device acc to availability

• Easy to use : AS400 system is very easy to operator if a operator or user do not know any command language he can use the menu options to make his work done.

• Ability to grow and improve the system with out any disruption.

DISADVANTAGE:

The main disadvantage is the AS400 system is too costly to afford.

                                   O.S

•The operating system used in AS400 is OS400.

•It is the licensed program support AS400.

• It controls the operation of program and helps us to schedule jobs and manage data.

•The OS400 give many support for the user to help his task to be done.

• It gives database support, work management support, application development support, system operation support, message handling support, security support.

AS400 objects
•LIBRARIES: A library is an object that is used to group related   objects. There are 3 types of libraries.

                     1.system      2.user      3.product
•Folder: All Files created by user are stored in folder.

•Files: File contain set of data of the user.

•Program: A program is an object containing a set of          instructions to be executed.

•Job queue: All the jobs submitted by a user are in job queue.

•Out queue: It contains the o/p requested by the user and   where user can take the data and print it or use it.

Message Queue Operator

•The command to check message queue operator is DSPMSG QSYSOPR

•When you give this command you can see all the process or tasks that are completed and not completed.

•There will be two columns in operator screen.

     1)message needing a reply.

     2) Message not needing a reply.

•The alerts which come under message needing a reply are much important and should be taken care immediate.

•The alerts which displays under Message not needing a reply are just for our reference.

•All the messages like STATUS of a job will come under Message not needing a reply.(So Message not needing a reply column is also important).

CPU STATUS

•To check the CPU % the command is WRKSYSSTS or DSPSYSSTS.

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•It will show the % of cpu memory utilized by the box.

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•In this screen we have to take care about DSAD%.

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•If the % is more than 90 we have to inform the tech support and according to their request we have to raise a ticket by using ticketing tool.