Mainframe tutorial

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Notify me of new posts via email. Search for: Close. MQSeries allows different applications to communicate asynchronously through queues across different operating systems, different processors and different application systems. Applications use MQI to read and write messages to the queues.

Messaging — Programs communicate by sending data in messages rather than by calling each other directly.

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Queuing — Messages are put on queues in storage, eliminating the need for programs to be logically connected. A queue manager is the part of MQSeries product which provides messaging and queuing services to application programs through MQI program calls. It controls access to the queues and serves as transaction coordinator for all queue operations.

Alias queue — Another name for local or remote queue. Typically used to switch queue destinations without modifying the program code. Model queue — A template whose properties are copied when creating a new dynamic local queue. Any arbitrary data that one program wants to send to another.

A message need to include other information such as its destination and possibly a return address. A request message needs a reply. The queue or distribution list must already be open. Share this: Twitter Facebook. Like this: Like LoadingA tutorial panel is a special type of panel that is processed by the ISPF tutorial program. This program invokes the panel display service to display the panel. ISPF tutorial panels are arranged in a hierarchy.

Generally, this hierarchy is a table of contents, each succeeding level of which contains a more detailed list of topics. When the tutorial is entered from a menu, the first panel to be displayed is usually the top of the hierarchy. When the tutorial is entered by use of the HELP command, the first panel to be displayed is a panel within the hierarchy, appropriate to what you were doing when help was requested.

When viewing the tutorial, you can select topics by entering a selection code or by simply pressing Enter to view the next topic. On any panel, you can also enter these commands:. Cursor positioning usually defines which scrollable area will be scrolled.

However, when in tutorial, if the cursor is not within a scrollable area, the first area defined in the BODY section will be scrolled. If you issue the HELP command while viewing a tutorial, ISPF displays a tutorial panel that contains a summary of commands that are available to the tutorial user. It is recommended that these two dialog variables be initialized at the beginning of the application to ensure that the user can always display the tutorial top or index, regardless of how the tutorial was entered.

One way to initialize these variables is to set them from the primary option menu, as shown in Example of a primary option menu. The index is optional.

It is a collection of panels in which topics are arranged in alphabetical order. The index need not be connected to the main tutorial hierarchy. It can be a topic that you can select from the main table of contents or other panels. A list of the last 20 tutorial panels displayed, including the current panel, is maintained by ISPF. The ZIND variable is used only on index pages; it should not be set on other tutorial panels. A panel cannot have both a continuation panel and selectable topics.

However, the last panel in a sequence of continuation panels can have selectable topics. Function variables, as well as shared and profile variables, can be displayed.

Figure 1 shows a sample hierarchy of tutorial panels. Panels A and B have three selectable topics each. Panels C and D2 have two selectable topics each. The other panels have no selectable topics. In Figure 1assuming that panel A is the highest-level table of contents, the viewer can get to A from any point by issuing the TOC command.

If the user enters the TUTOR command along with a panel identifier parameter, a specific tutorial panel within the Help hierarchy is displayed. From that point on, any movement within the hierarchy is the same as if the user had reached the panel by any other means. Two sample tutorial panels are shown in Figure 2 and Figure 3.

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These are assumed to be panels B and F2, respectively, in the hierarchy in Figure 1. Panel B has three selectable topics. If none of the valid options is selected, a question mark?

This indicates that panel G is displayed if the user selects option 3, but is bypassed if the user repeatedly presses Enter to view each topic. The order in which topics are presented when Enter is pressed is the same as the order in which they appear in the TRANS function.Each field in a map has an attribute field associated with it.

Mainframe Testing - Complete Tutorial

A field, from a user point of view is any location where he can enter data. But in reality all the literals, field identifiers, displayed data, data-entry locations, etc.

Each attribute occupies one position on the map and controls the field, which immediately follows it. A judicious use of the map attributes will help a great deal in making the maps user-friendlier. Attributes control individual map fields on the screen.

A field can be received as alphanumeric data, left justified padded with blanks or numeric NUMdata, that is right justified padded with zeros. The cursor can be placed in a particular field by specifying the Insert Cursor IC attribute or by symbolic cursor positioning. The attribute character is 1 byte of data consisting of the bit pattern shown in the following table:.

This list covers the most required attribute characters for an application program. You can use this list by copying it into the working storage section of the application program through a COPY statement. Introduction To Software Development.

Introduction To Job Control Language jcl.

mainframe tutorial

Procedures And Symbolic Parameters. System Security And Intersystem Communication. Cics Debugging Facilities And Techniques. Data, Information And Information Processing. Introduction To Database Management Systems. Database Architecture And Data Modeling. Overview Of Information Management System ims. Ims, Db2 And Ispf. Ibm Mainframe Interview Questions. Ibm Mainframe Practice Tests. IT Skills. Management Skills. Communication Skills.We'll introduce you to the hardware and peripherals.

We'll talk about the operating system, the software installed on a mainframe. We'll also talk about the different people who work on a mainframe. In a nutshell, we'll de-mystify the mainframe. Readers based in Indiacan buy the e-book for Rs. International readers based in the US and other countries can click here to purchase the e-book. Saturday, March 10, Introduction to Rexx. What is Rexx? Is Rexx easy to learn? Why should I program in Rexx? Rexx was developed in the yearby a programmer, Mike Cowlishaw, who is now a visiting professor at the University of Warwick.

The language Rexx is recommended for beginners, because it has a simple instruction set — just a couple of dozen instructions. Rexx is a free-form language.

Mainframe Basics Terminology 1

On the other hand, Rexx is an interpreted language. Once you code a Rexx Program, you don't have to compile it. Instead, the Rexx Interpreter simply reads your source-code one line at a time, interprets it and executes it. One of the reasons, why you should learn Rexx, is that it increases the productivity of the average Mainframe Programmer.

Repetitive tasks which are tedious, and require manual labour can be automated using Rexx. Rexx programs you can talk to other software applications that run on the Mainframe. But, as a norm, you generally write programs in COBOL to implement business rules, build an Insurance Product like a Annuities system, or a banking product.

How do you code comments in Rexx? What is the SAY instruction? Every Rexx program should contain the word "Rexx" in its first line of source-code. Usually this will be a comment.

Its a good practise that you liberally sprinkle your Rexx Program with comments, explaining the purpose and meaning of the code. This helps your friends understand your code. For example, say 'Hello World' would display Hello World on the screen. Rexx does not require you to explicitly declare variables. For example, the variable number is assigned the integer-value 5.

So, say number would display the value 5 on the Mainframe Screen. The variable text is assigned the character string 'I am learning Rexx'.

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How do I execute or run my Rexx Program? To execute a Rexx Program, a simple and easy way is to type the character 'ex' as in execute, against the member-name in the Personal Data-set PDS Library you are using to store your Rexx Programs.

The name of my program is REXXTo all the readers of this site and people who got benefited from the content ,I wanted to apologize personally as it looked like the site was not operating for many months and worst thing was ,no monitoring from my end. I got to know about the issue only yesterday and the website is back … Read more The Website is back online. Anyone who is into application support or development would have come across TEST environment or TEST system or lower environment ,which exists to help people to do any changes or corrections on the need basis as no one will have access to production or live or higher environment.

We can use any of the existing debugging tool to analyze a program, In case if you are missed out,here is the link to get to know basic things to follow to Effectively use debugging tool. There are many books available in the market on DB2 programming which helps us to learn and better our self in DB2.

Wanted to list out some of the good books available which helps to learn DB2 programming and the list as below. In any programming language, conditional processing is available to help to achieve something only when certain condition happens. That is indeed used across widely as most of the times the processing in any program is based on certain conditions and that portion of code runs only when condition matches.

Anyone who is into application support or development would have faced a scenario where in some program need to be analyzed in order to solve some issue or to understand how the program works. If the program is a small one,then that can be analyzed easily may be with the help of example data.

But if … Read more How to effectively use Debugging tool for problem resolution. Have listed out some of the Mainframe application support interview questions below which might be of help here. If you are attending any Mainframe interview as an application programmer,most of the times questions on GDG are asked.

So wanted to list out some of the important GDG interview questions here. Freshers are mostly asked about the basic topics or questions in any DB2 interview.

Below is the list of DB2 interview questions for freshers that are mostly asked in any DB2 interview for application programmers:Amazon. How compilation process differs … Read more DB2 interview questions for freshers. Older posts.Before learning mainframe testing concepts, lets learn What is a Mainframe? The mainframe is a high performance and a high-speed computer system. It is used for larger scale computing purposes that requires great availability and security.

It is mostly used in sectors like finance, insurance, retail and other critical areas where huge data are processed multiple times. What is Mainframe Testing? While performing Mainframe testing, the tester only needs to know about the navigations of the CICS screens. They are custom built for specific applications.

The changes that work on one terminal emulator will work on others. The Mainframe application otherwise called job batch is tested against the test cases developed using requirements Mainframe Testing is usually performed on the deployed code using various data combinations set into the input file.

MAP ATTRIBUTES - IBM Mainframe

Applications that run on the mainframe can be accessed through terminal emulator. The emulator is the only software that needs to be installed on the client machine. It is a technique to use memory effectively to store and execute various sized tasks. It uses disk storage as an extension of real storage. Multiprogramming The computer executes more than one program at the same time. But at any given moment only one program can have control of CPU. It is a facility provided to make efficient use of the CPU.

Batch Processing It is a technique by which any task is accomplished in units known as jobs. A job may cause one or more programs to execute in a sequence. The Job scheduler makes a decision about the order in which the jobs should be executed. To maximize the average throughput, jobs are scheduled as per their priority and class. JCL describes the batch job — programs, data and resources needed.

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Time Sharing In a time-sharing system, each user has access to the system through the terminal device. Instead of submitting jobs that are scheduled for later execution, the user enters commands that are processed immediately. Hence this is called "Interactive Processing".

It enables the user to interact directly with the computer. Time-share processing is known as "Foreground Processing" and the batch job processing is known as "Background Processing. The spooled output is directed to output devices like a printer if needed. It is a facility exploiting the advantage of buffering to make efficient use of the output devices. Classification of Manual Testing in Mainframe Mainframe Manual Testing can be classified into two types : Batch Job Testing — Testing process involves executions of batch jobs for the functionality implemented in the current release.This is free Mainframe tutorials.

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I will keep updating and adding more contents as and when possible. Post a Comment. Table of Contents 1. Overview 1. Database Approach 1. Data Integrity 1. Application Development Productivity 1. Different Database Architectures 1.

mainframe tutorial

Hierarchical 1. Network 1. Relational 1. Logical Database Structure 2. Entity, Logical and Physical Structure 2. Attributes, Relationships — Training Database 2. Entity-Relationship Diagrams 2.

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Schema, Subschema 3. Operating Environment 3. Run-Unit 3. Virtual Storage Layout 3. DML Execution Steps 4. Physical Database Structure 4. Areas 4. Pages 4. DB-Key 4. Multiple Areas 4. Files 4. Record occurrence — Prefix, Data 5. Record 5. Record Name 5.

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Record Identifier 5. Storage Mode 5. Record Length 5. Location Mode 5.

mainframe tutorial

Duplicates Option 5. Area Name 5. Bachman Diagram For Record Type 6. Set 6. Set Name 6.


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