MURACHS MAINFRAME COBOL PDF

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ma, 01 apr GMT murach mainframe cobol pdf - programming manuals and tutorials for. CICS Transaction Server,. Mainframe CICS (TS). Although Murach's Mainframe COBOL is a great first book for learning how to To view the table of contents for this book in a PDF, just click on the link below. Get Free Access To | Murach Mainframe Cobol PDF Now. MURACH MAINFRAME COBOL. Download: Murach Mainframe Cobol. MURACH MAINFRAME.

Two benefits of sequential updating and maintenance are 1 the automatic creation of a backup file and 2 improved efficiency due to reduced actuator movement and rotational delay. Given the specifications for a program that processes a file of variable-length records, develop the program. The variable-length records can contain two or more record types or a varying number of segments. Knowledge Explain how you use the File Status clause of the Select statement in a program.

In general terms, explain how matching record logic works in a sequential update or maintenance program.

Explain how you determine whether a test run for a sequential update or maintenance program has worked correctly. Describe two techniques that you can use to work with files that contain variablelength records. Summary You can open a sequential file in input mode, output mode, extend mode, or I-O mode.

The mode you use determines what I-O operations you can perform on the file. That value will indicate what the result of the operation was. A sequential update program creates a new master file from an old master file and a file of transactions that update fields in the old records.

A sequential maintenance program creates a new master file from an old master file and a file of transactions that can add, delete, and change records in the master file. Sequential update and maintenance programs use matching record logic thats based on the comparison of control fields in the master and transaction records.

This logic determines when records are read from the transaction and old master files and when records are written to the new master file. You often need to abend a program when a serious error occurs. A file of variable-length records can have two or more record types with different lengths or a segment that occurs a varying number of times.

Terms fixed-length records ddname input mode output mode extend mode I-O mode file status code sequential update program matching record logic control field matched transaction unmatched transaction apply a transaction sequential maintenance program abend storage dump variable-length records segment root segment repeating segment 26 Student Workbook for Murachs Mainframe COBOL Chapter 14 How to work with indexed files Objectives Applied Given complete program specifications, develop a program that processes an indexed file sequentially, randomly, or dynamically.

The program may use the primary key or an alternate key to access the records in the file. Knowledge Name the three access modes you can use for an indexed file. Describe the operation of the Read, Write, Rewrite, and Delete statements when used with random access of indexed files. Describe the operation of the Start statement and name the two types of access that it can be used with.

Explain how you can use file status codes to determine when all of the records for a alternate key value have been processed. In general terms, describe dynamic processing. In general terms, describe skip-sequential processing. Summary You can process an indexed file using sequential access, random access, or dynamic access thats based on the files primary index or an alternate index.

You can also use the Invalid Key clause of the Read, Write, Rewrite, Start, and Delete statements to catch the four file status codes that indicate an invalid key condition. You can use the Start statement to start sequential processing of an indexed file at a specific location.

To process an indexed file by alternate keys, you code the Alternate Record Key clause on the Select statement for the file.

If duplicate keys are allowed, you must also code the With Duplicates phrase. To read a record randomly using an alternate key, you must include the Key clause in the Read statement. To read records sequentially based on an alternate key, you can use the Start statement to position the file and then Read statements to read the records sequentially.

A file status code of 02 indicates that the file contains at least one more record with the same key. A file status code of 00 indicates that there are no more records with the same key. You can use dynamic processing when you want to read the first record in a group randomly and then read the other records in the group sequentially.

You can also use skip-sequential processing to process the records in a group. Terms primary index sequential access random access dynamic access alternate index duplicate keys unique keys dynamic processing concatenated key skip-sequential processing 28 Student Workbook for Murachs Mainframe COBOL Chapter 15 How to work with relative files Objectives Given complete program specifications, develop a program that processes a relative file.

Knowledge In general terms, describe how you process a relative file sequentially. In general terms, describe how you process a relative file randomly. Summary You can access a relative file sequentially, randomly, or dynamically. If you access the file randomly or if you use a Start statement to position the file, the Select statement for the file must identify the field that will contain the relative record number of the record to be accessed. The Relative Key field thats named in the Select statement for a relative file must be defined in working storage.

The difference is that the records are retrieved by their relative record numbers rather than by their key values. When you read a relative file sequentially, the program automatically skips over any record areas that dont contain data. When you process a relative file randomly, you can use the Invalid Key clause of the Read, Write, Rewrite, Delete, and Start statements to trap invalid key conditions just like you do for indexed files.

Explain why an internal sort or merge is typically more efficient than a standalone sort or merge. Summary When you sort a file, the records in the file are sequenced based on one or more key fields. When you merge two or more files, the records in the files are combined into a single file and are sequenced based on one or more key fields.

When you execute this program directly, its called a standalone sort or standalone merge. To perform an internal merge, you use the Merge statement. For a sort operation, you can use an input procedure to select the records to be sorted from the input file.

Murach's Mainframe COBOL

If you dont use an input procedure, all of the records in the input file are sorted. After the records are sorted, you can use an output procedure to process the sorted records. This procedure must include a Return statement to retrieve the records from the sorted file.

If you dont use an output procedure, the sorted records are written to an output file. You cant use an input procedure for a merge operation, which means that all of the records in the input files are merged.

However, you can use an output procedure. If you dont, all of the merged records are written to an output file. Describe these five features of mainframe computer operating systems: virtual storage, multiprogramming, spooling, batch processing, and time sharing.

Today, mainframes are also called servers to highlight their adaptability to e-commerce applications. Terminals are the workstations that are used on mainframes, although PCs running emulation software are commonly used as terminals today. Direct access storage devices, or DASDs, are the disk devices that are used on a mainframe. Virtual storage is a software feature that lets a large amount of main storage be simulated by a processor that has a smaller amount of real storage.

Then, multiprogramming is used to run more than one program at a time in the virtual storage. Spooling manages printer output by intercepting the output and storing it on disk so it can be printed later on. Spooling runs as one of the programs thats being multiprogrammed. Job control language, or JCL, describes the jobs that are to be run by the system.

The systems job scheduler controls the execution of the jobs that are submitted for batch processing. With time sharing, many users can do interactive processing at the same time. The time sharing program runs as a batch job in the multiprogramming environment. A number of other terms were presented in this chapter, however, and youre likely to hear them used in your conversations with other application programmers, systems programmers, and operators.

Then, create and submit a job that uses a cataloged procedure to compile and link-edit the program. Use ISPF to create a sequential data set that will contain the data used as input to your program. Use SDSF to display the output from a compile-and-link job. If the job output contains compile-time errors, correct the errors and compile and link-edit the program again.

If a run-time error occurs, correct the problem and compile, link-edit, and execute the program again. Knowledge Describe the three steps involved in compiling and testing a program. Include a description of the input and output to each step. The files on an IBM mainframe are called data sets. The two types of data sets youll use most often are partitioned data sets and sequential data sets. A partitioned data set consists of a directory and one or more members.

You use partitioned data sets to store your source programs, object modules, load modules, and the JCL to compile, link-edit, and execute them. Before you can use a data set, you must create, or allocate, it. You can use the ISPF editor to create new members and edit existing members. You can also use the editor to enter data into a sequential data set. To allocate the data sets required by a program or procedure, you code DD statements.

To use a cataloged procedure, you code a job that executes it and supplies the required input and output data sets. TSO commands are especially useful for running additional test runs for the same load module without recompiling and linking. You can use SDSF to work with jobs and their output.

To do that, you use SDSF options to display the jobs in the input queue and the job output in the output queue and the held output queue. Terms compile-link-and-go procedure source program compile object module link linkage editor load module command area panel program function PF key data set partitioned data set PDS library sequential data set directory member allocating a data set qualifier high-level qualifier edit profile edit data display heading area primary command line command area line command screen window identifier field name field operation field parameters field job step job name step name ddname cataloged procedure loader compiler option concatenating libraries SDSF System Display and Search Facility input queue output queue held output queue job-id job log return code JCL listing message log 35 Student Workbook for Murachs Mainframe COBOL Chapter 19 How to use Access Method Services to work with VSAM files Objectives Applied Given the specifications for an AMS job that uses any of the commands covered in this chapter, code the job.

In general terms, explain how VSAM files are stored.

In general terms, explain how alternate indexing works and how it affects the efficiency of VSAM file access. List three AMS commands that youre likely to use and describe what they do.

By convention, the high-level qualifier in a data set name is the name of the user catalog in which it is entered. A key-sequenced data set KSDS in VSAM is a cluster that consists of an index component that contains the primary keys for the records and a data component that contains the data.

To facilitate the addition of records, free space can be assigned to the data component. An alternate index is actually a KSDS with the alternate keys in the index component and the primary keys in the data component.

A Fresh and Modern Look at All Things Mainframe

This leads to significant processing overhead. Name two CICS modules that support application programming. Explain how pseudo-conversational programming works and why its recommended for CICS programs.

Describe two functions that the CICS translator performs. Describe the purpose of a BMS mapset, and explain how you code one. In general terms, describe the coding of the first procedure in a CICS program. Explain the benefits of web-enabling CICS applications instead of writing new web applications.

Summary Every CICS program is associated with a transaction that can be invoked by entering a transaction-id. The terminal control and BMS Basic Mapping Support modules control interactions with the display station, and the file control modules control interactions with the access methods like VSAM.

To use BMS, you code an assembler language program called a mapset that contains the definitions of one or more maps. Then, you assemble the mapset to create a physical map thats used to determine the appearance of the data displayed on the screen and a symbolic map thats used by the COBOL program. With this type of programming, a program ends after it sends data to a terminal. Then, CICS restarts the program when the user completes an entry.

Explain how two tables in a relational database are related. List the three types of relationships that can exist between two tables in a relational database.

Name the SQL statement that you use to retrieve data from a relational database, and describe the results of that statement. Name the three SQL statements that you can use to modify the data in a relational database. Explain what a join is, and describe the most common type of join. Describe the purpose of the DB2 precompiler and list its two types of output.

In general terms, explain what binding a program means. Summary A relational database consists of one or more tables.

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Each table contains one or more rows, or records, and each row contains one or more columns, or fields. Most tables contain a primary key that uniquely identifies each row in the table and one or more indexes that improve access to the rows in the table. Three types of relationships can exist between tables: a one-to-one relationship, a one-to-many relationship, and a many-to-many relationship. Tables are typically related by a foreign key in one table that refers to a primary key in another table.

The most common type of join is an inner join or equi-join. With this type of join, rows from the two tables are included in the result table only if their related columns match. If a result table will contain two or more rows, you have to use a cursor to process one row at a time.

You use a host structure within a COBOL program just as you use a record description for a sequential or indexed file. This produces a modified source program and a database request module DBRM that contains information about how your program will use DB2. After you compile and link edit a program to create a load module, DB2 must bind the program to check all the DB2 functions it uses.

You can bind a program directly into an application plan, or into a package and then into a plan. Explain how you should document a program within its source code. Summary Perform Thru statements let you execute more than one procedure in a single Perform statement.

Within the performed procedures, Go To statements are commonly used to pass control to the exit procedure. A program can be divided into sections within the Procedure Division.

Then, you can use Perform statements to perform sections. Mainframe Programming Books. Previous Editions Still in Stock. About Our Courseware. Courseware Overview. What Our Courseware Includes.

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Murach's Mainframe COBOL

International Booksellers. download Murach Books. My Account. Murach Books Website. Contact Us Register Sign In. List price: Request a printed review copy Request an eBook review copy Request the instructor's materials. download This Book You are currently on the Murach site for instructors. Section 2: Other COBOL essentials In this section, your students will learn how to work with intrinsic functions, dates, characters, tables, copy members, and subprograms.

Section 3: Section 4: So in this section, your students will learn: But here are four that are specific to this book: In chapters 4 and 5, your students learn the structured programming methods that are used in the best mainframe shops.

They became an ad hoc standard in many mainframe shops by the mids. This gets the students programming right away without all the added complexity of working with files. Then, chapter 2 shows the students how to compile and test their programs. To view the table of contents for this book in a PDF, just click on the link below: The source code and data for the programs in the book. Are your structured methods used in industry?

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Books for College Instructors. Murach for Instructors Website. Customer Service Section 1: Section 2: Section 3: Section 4: But here are three that are specific to this book: In chapters 4 and 5, you'll learn the structured programming methods that have been used in the best mainframe shops. They became an ad hoc standard in many mainframe shops by the mids. Besides teaching standard COBOL, which can be run on any computer system, ours is the only book that shows you how to work in the IBM mainframe environment.

Whether you're a beginner or a professional, you'll boost your productivity by using these as models when you create or maintain COBOL programs.One-thousand four-hundred twenty-three This type of subprogram is sometimes used in check printing programs.

And this is the only book that shows you the techniques that were used to develop those programs. With time sharing, many users can do interactive processing at the same time.

For readability. Given the specifications for a program that processes a file of variable-length records, develop the program. When you search a variable-length table using the Search or Search All statement, only the occurrences that contain entries are searched. N Enter a series of numbers that range from

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