W1L2ops400.ppt1 Lecture 1 OPS400 AS/400 / iSeries / eSeries Mid-Range Operating System OS/400

2 Why are we studying the AS/400?  There are hundreds of thousands of them out there.  98% of Fortune 100 Companies have an AS/400  Seneca is one of the few colleges to offer AS/400 courses, this makes you marketable!  Jobs! Jobs! Jobs!

3 The AS/400? IBM’s Midrange Computer What does midrange mean? In general, larger than a PC and smaller than a Mainframe!

4 Positioned PC MidRange Main Frame

5 What is an AS/400? IBM’s “Application System”/400 Multi-user, multi-tasking Is most often used by a company to run their daily business transactions Can be used for special applications within a large organization Uses Single-level storage concept RAM - DASD (seamless)

6 Industry Examples Sprint Canada Grand and Toy Canadian Tire Microsoft !! Praxair See IBC233 web page for list of other companies using the AS/400 (these are just the ones we know about!)

7 Why does a company use an AS/400? Cost effective Reliable Hundred’s of thousands applications available Easily upgraded as business grows Supports state-of-the-art technology Doesn’t require a large support staff

8 “System” The AS/400 is the “system” –“The system is down” –“The system is slow today”

9 OS400 AS/400 Operating System Object-Based - User Profiles –Job Queues –Files –Programs Not only does it control all the activity on the AS/400, but it also incorporates many features that would be separate software components on other systems.

10 Licensed Programs Application Development Tools –PDM (you will see this in the first lab) OfficeVision –similar to MS-Office, but AS/400 based Communication Support –Client Access (command line and GUI based) Programming Languages –Pascal, PL/1, Basic, RPG, C, C++, Cobol, Java, SQL, etc.

11 System Values are control and configuration attributes. They are used to customize a system to the needs and specifications of an organization. Some are Date and time. Editing. system control. user control. etc. etc DSPSYSVAL - WRKSYSVAL - CHGSYSVAL

12 “User” A person who “uses” the AS/400 You are all “Users” each with an unique Userid A Userid identifies you to the system when you signon or run a job Each Userid has a User Profile which describes the user attributes, one of which is authorities.

jobpresentation.ppt13 What is it ? Types of ? How invoked ? A JOB

14 A “job” is any and every piece of work / activity on the AS/400 similar to a “Process” in Unix. - System functions - Utilities - User tasks - etc.

15 It consists of one or more tasks executed either successively or simultaneous while sharing resources. lecturing learning meeting greeting

16 INTERACTIVE (USER) High run time priority on job queue (20) QUICK response Low resource requirement (memory – disk) Some Types of jobs BATCH NO interactivity (only messaging) Low run time priority on job queue (50) High resource requirement (memory – disk – media) CLI – Command line interface Batch, Daemons, cron In UNIX

17 “Interactive Jobs” also called sessions it begins when a user signs on to the system and ends when they sign off. Has interaction between the user and the AS/400, similar to a conversation (a polite conversation!). Input entered via the work station.

18 “Batch Jobs” Runs in the background. No interactive input from the screen, receives data from files or data communication. Generally uses a lot of resources. Submitted / initiated by ANY job e.g. a program compile Communicate with the system through messaging.

19 JOBS - HOW INVOKED? Signing on and starting an interactive session Called by another JOB. (spawned) Automatic system function SCHEDULED once or repetitively

20 Job Inheritance Attributes / properties are passed on from the initiating / spawning job The initial Job (starting session) inherits attributes from other sources such as System values, values from a user profile and from a job description are retrieved.

21 “Jobs and subsystems” Each Job runs in a specific subsystem based on type. A subsystem is where the system brings together and prioritizes the resources needed to process work of LIKE type to optimize performance.

22 System vs Subsystems Access the WoRK with ACTive JOB Command to see the difference System is the entire AS/400 Sub-System is a logical grouping of system resources designed to process jobs with similar requirements and demands on the resources.

23 “Subsystem” Each (there are many) has been allocated a share of the total resources available in the system based on requirements. A Job runs in a specific subsystem. A subsystem is where the system brings together the resources needed to process work of LIKE type. Enable better performance tuning. Described / defined in subsystem descriptions. (*SBSD). Most are started at IPL time.

24 There are many subsystems the most common are QCTL QINTER QBATCH, QBATCH2, etc QCMN QSPL

25 the best known are Interactive jobs run in subsystem QINTER Batch jobs run in subsystem QBATCH

26 Queues A queue is a line-up! A place where things wait. Examples of AS/400 queues: –job queues: where batch jobs wait –message queues: where messages wait –output queues: where spool files wait to print Controlled by –Run time priority –Position in Stack –Etc

27 The AS/400 is easy to use Menu driven Lots of built-in help Built-in security

28 Originally the AS/400 is “Green Screen” is 5250 emulation Block mode v.s. Character mode Green screen v.s. GUI (Graphical User Interface –You can’t point and click in emulation mode! –You must use the TAB keys to go from field to field –Use the key to “send”.

29 The Signon Screen The first level of security, it keeps out unauthorized people It requires a valid userid and password ( see your sticky label) Always remember to signoff if you are going to leave your computer. If you don’t, someone could come along and clobber your work!

30 “Green Screen”

31 AS/400 Screen Types Menus: includes menu selections, command line, function keys, header info Entry: e.g. Command Prompt screen which includes parameter description, input fields, function keys, header info Information screens: e.g. help screens List screens: e.g. ‘work with’ screens includes list of objects or members, options, command line, function keys, header info.

32 MAIN AS/400 Main Menu System: ODIN Select one of the following: 1. User tasks 2. Office tasks 3. General system tasks 4. Files, libraries, and folders 5. Programming 6. Communications 7. Define or change the system 8. Problem handling 9. Display a menu 10. Information Assistant options 11. Client Access/400 tasks 90. Sign off Selection or command ===> go major. F3=Exit F4=Prompt F9=Retrieve F12=Cancel F13=Information Assistant F23=Set initial menu MENU SCREEN

33 Specify Members to Work With Type choices, press Enter. File QCLSRC Name, F4 for list Library ABERNS *LIBL, *CURLIB, name Member: Name *ALL *ALL, name, *generic* Type *ALL *ALL, type, *generic*, *BLANK F3=Exit F4=Prompt F5=Refresh F12=Cancel ENTRY SCREEN

………………………………………… : All Spooled Files - Help : : : The Work with All Spooled Files display shows all (or a specified : : portion) of the spooled files that are currently on the system. The : : purpose of this display is to allow you to find spooled files on the : : system. This display is shown when you specify the assist level : : parameter as intermediate, ASTLVL(*INTERMED) on the WRKSPLF command. : : : You can type an option number next to one or more files. When you : : then press the Enter key, the function associated with the selected : : option is performed for each of the selected files. : : : If you press the Enter key from this display without typing any : : other data, you are returned to the previous menu or display. : : : You can type parameters in the command line if you want to override : : the defaults for the options you typed. You can type parameters : : More... : : F3=Exit help F10=Move to top F12=Cancel F13=Information Assistant : : F14=Print help : : : ……………….….: INFORMATION SCREEN

35 Work with All Spooled Files LIST SCREEN Type options, press Enter. 1=Send 2=Change 3=Hold 4=Delete 5=Display 6=Release 7=Messages 8=Attributes 9=Work with printing status Device or Total Cur Opt File User Queue User Data Sts Pages Page Copy __ APVENDOR ABERNS ABERNS RDY 4 1 __ OP400PF ABERNS ABERNS RDY 4 1 __ ARTRANPF ABERNS ABERNS RDY 3 1 __ ARUPDT ABERNS ABERNS RDY 6 1 __ ASSIGN2 ABERNS ABERNS RDY 4 1 __ ARTRANS ABERNS ABERNS RDY 6 1 __ QPDZDTALOG ABERNS ABERNS RDY 2 1 __ PGM400D03 ABERNS ABERNS RDY 4 1 __ INVTRY ABERNS ABERNS RDY 3 1 More... Parameters for options 1, 2, 3 or command ===> ______________________________________ F3=Exit F10=View 4 F11=View 2 F12=Cancel F22=Printers F24=More keys

36 CL - Control Language Used from the command line - interactively or in CL programs (Scripting in UNIX) which can be called from - the command line - A Command directly - From within other programs in either batch or interactive mode

37 “Objects” anything on the AS/400 that has a name and takes up space in storage and is not of a temporary nature and has action” on Unix/Windows, everything is a file on AS/400, everything is an object on Windows, files have extensions (.txt) on AS/400 objects are of TYPE and subtype Common object types include: –libraries, files, job queues, programs

38 *ALL *CTLD *AUTL *DEVD *DOC *DTAARA *CMD *DTAQ *FILE *LIND *MENU *MSGQ *JOBQ *LIB *OUTQ *QRYDFN *SBSD *PGM *USRPRF Some OBJECT type identifiers are (special values)

39 Data Storage Hierarchy Library Objects Members contain data

40 “Libraries” Library: an object whose purpose is to ‘store’ and index other objects. ie. objects are ‘stored’ in libraries. Exactly like a directory in Unix/Windows however you do not have libraries within libraries on the AS/400 (one exception).

41 Files - type *FILE Are objects that store data subtypes / attribute PF-DTA DATA file ie. customer file: customer #, address, billing info etc. for each customer PF-SRC SOURCE file special file that stores a programmer’s source code (scripts)

42 File Members Source files have many ‘members’ one member for each source (script) program PDM (Prog Dev Mgr) gives easy access to a programmer’s stuff (libs/files/mbrs)

43 Main Menu - GO MAIN

44 Major Menu - GO MAJOR

45 Verb Menu GO VERB

46 Commands Menu - Clear - GO CMDCLR

47 Clear File Example Using PROMPTing

48 Clear Physical File Command

49 ‘?’ in Member Parameter

50 Definition of the Member Parameter (Field Level Help)

51 Definition of the CLRPFM Command (Extended Help)

52 The Lab 1 Objectives are Get you familiar with AS/400 green screens, using menus etc. Review some of the definitions covered in lecture (user profile, jobs, subsystem, screen types, accessing help) Set up your stuff for later labs (a file for you to store your programs)

53 What to do next Read/Study Chapter 1 of the text Install C/A and or Mocha on your PC at home (if you have one)