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- PROGRAM LOGICAL LEVELS - IBM Mainframe
PROGRAM LOGICAL LEVELS - IBM Mainframe
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Job SearchThe application programs under CICS run at various logical levels. The program at the highest logical level receives control form CICS. A LINKed program runs at the next lower level and gets control from the LINKing program. But an XCTLed program is at the same level as the XCTLing program. The RETURN command always passes control back to the next higher level. So a RETURN command from a program will return the control back to CICS. Also a RETURN command from a XCTLed program will return command to CICS because both the programs are at the same logical level and the next higher level is CICS. The following figure explains the concepts discussed above
LINK and XCTL
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Ibm Mainframe Tutorial
- Software Development Life Cycle Phases
- Software Development Process
- Overview Of The Software Development Life Cycle Phases
- How Mainframe Computer Compare With Mini-computers And Micro Computers
- Hardware Configurations
- The System/360-370 Family
- Processors
- Multiprocessing
- Pr/sm
- Channels
- Members Of The Ibm Mainframe Family
- Input/output Devices
- Applications
- System Software
- Characteristic Features Of Mainframe Operating Systems
- Two Typical Mainframe Configurations
- Address Spaces
- Addressing Mode And Residence Mode
- Multiple Virtual Storage (mvs)
- Multiprogramming
- How Mvs-370 Address Spaces Are Organized
- Mvs And Extended Architecture
- Enterprise System Architecture-370 (mvs-esa)
- Mvs/esa Dataspaces And Hiperspaces
- How Mvs Manages User Data
- Vsam And Non-vsam Data Management
- How Data Sets Are Stored
- Catalogs
- Data Set Organizations
- Data Managememt Under Mvs Operating System
- Data Protection
- How Data Sets Are Processed
- Storage Management Subsystem
- Job Managent
- How Mvs Manages User Jobs
- Jobs And Job Control Language
- Job Entry Subsystems
- How Jes2 And Jes3 Process Jobs
- Foreground Tasks And Background Tasks
- The Mvs System
- System Data Sets
- Subsystem And Other Mvs Facilities
- What Is Ispf
- Jes2 And Jes3 Job Entry Subsystems
- Storage Management Subsystem (sms)
- Jcl
- Mainframe Information Representation And Storage
- Sequential Data Sets
- Partitioned Datasets
- Indexed Files (isam & Vsam)
- The Structure Of Jcl
- Multi-step Job Streams
- Job Parameters
- Exec Statement Parameters
- Job And Exec Statements
- The System Catalog
- Concatenating Data Sets
- Proc
- Generation Data Groups (gdg)
- Compile/link-edit And Run Jcls
- Mvs/jcl Environment
- Iebcopy
- Iehprogm
- Iebcompr
- Iefbr14
- Overview Of Storage Organization
- Access Method Services (ams)
- Loading Vsam Datasets
- Ksds
- Path And Alternate Index
- Ams Commands For Alternate Index Creation
- Vsam Commands
- Jcl Delete Command
- Alter Command
- Verify Command
- Export And Import
- Modal Command
- Vsam
- Rexx
- Features Of Rexx.
- Program Structure -rexx
- The Rexx Data Model
- Scope Of Variables
- String Manipulation And Parsing
- Other Features Of Rexx
- History Of Ibm Mainframes
- System Concept
- Control Programs And Tables
- Initiation Of A Cics Transaction
- Batch And On-line Systems
- Cics Fundamentals
- Programming Languages In Cics Applications
- Cics 'exceptional Condition
- Handle Condition Command
- Ignore Condition Command
- No Handle And Resp Option
- Push And Pop Commands
- Address And Assign Commands
- Exec Interface Block (eib)
- Storage Control
- Cics Application Programs
- Task, Transaction And Programs
- PROGRAM LOGICAL LEVELS
- Link
- Distributed Program Link
- Xctl
- Commarea And Data Passing
- What Is Return Command
- Load
- Release
- Processing Program Table (ppt)
- Program Control Table (pct)
- Terminal Conversation
- Virtual Storage Access Method
- Opening And Closing Of Files
- File Control Commands
- Special Services Of File Control
- Read
- Write
- Rewrite Command In Ibm
- Why Delete Command Is Used?
- Syntax Of The Unlock Command
- Transaction Deadlocks
- File Browse Commands
- Startbr
- Readnext
- Readprev
- Endbr
- Resetbr
- File Control Table (fct)
- Terminal Control Commands
- Receive
- Send
- Issue Print
- Issue Copy
- Attention Identifier
- Handleaid
- Terminal Control Table (tct)
- Cics Transactions
- Structure Of Cics Application Program
- General Programming Guidelines
- Cobol Programming Guidelines
- Dynamically Managing Memory
- Communicating With Databases
- Communicating With Tasks And Programs
- Basic Mapping Support
- Physical And Symbolic Maps
- Maps And Mapsets
- Map Definition Macros
- Modified Data Tag (mdt)
- Designing User-friendly Maps
- Map Design Guidelines
- Map Attributes
- Dynamic Attribute Character Assignment And Dynamic Cursor Positioning
- Send Map
- Receive Map
- Send Control
- Send Text
- Send Page
- Multi-text Operations
- Page Building
- Terminal Paging
- Application Programming For Page Building
- Text Building
- Message Routing
- Route
- Transient Data Queues
- Writeq Td
- How To Use Writeq Ts Command
- Readq Td
- Deleteq Td
- Destination Controllable (dct)
- Automatic Task Initiation (ati) And Trigger Level
- Design Considerations For Tdq
- Temporary Storage Queue
- What Is Writeq Ts Command
- Readq Ts
- Deleteq Ts
- Design Considerations For Tsq
- Cics Interval Control Program
- Asktime
- Formattime
- Delay
- Post
- Wait Event
- Start
- Retrieve
- Cancel
- Suspend
- Enq
- Deq
- Data Processing Application System
- Requirement Analysis
- General Design
- External Design
- Internal Design
- Programming And Testing
- Implementation And Turnover
- User Interface Design
- Resource Usage
- Performance Considerations
- System Reliability And Maintainability
- Menu Driven Systems
- System And Programming Standards
- Introduction To Recovery And Restart
- Cics Recovery Concepts
- Task Recovery Methods
- Defining Recoverable Transactions
- Cics Provided Recovery Services
- Services Requested By Application Programs
- Additional Recovery Options
- Choosing A Recovery Technique
- Journal
- Journal Control Table (jct)
- System Restart
- Extended Recovery Facility (xrf)
- Introduction To System Security
- Sign-on Table (snt)
- Other Security Management Techniques
- Cics Intersystem Communication
- Multiregion Operation
- Intesystem Communication
- Function Request Shipping
- Asynchronous Processing
- Transaction Routing
- Distributed Transaction Processing (dtp)
- Control Functions In Debugging
- Execution Diagnostic Facility
- Handle Abend
- Abend
- Dump
- Trace Control
- Enter
- Cics Dumps
- Cebr Command
- Ceci Command
- Cemt Command
- Dynamic File Open-close(dfoc)
- Bms Map Definition Macros
- Common Cics Copylib Members
- Common Response And Abend Codes
- Eibrcode
- Common Abend Codes
- Other Common Abend Codes
- What Is Information ?
- History Of Information
- Quality Of Information
- Information Processing
- Information And The Enterprise
- Information As A Competitive Weapon
- Database Management System (dbms)
- Why A Database
- Characteristics Of Data In A Database
- Database Management System
- Why Dbms
- Types Of Database Management Systems
- Relational Database Technology
- Rdbms Terminology
- The Relational Data Structure
- Relational Data Integrity
- Relational Data Manipulation
- Codd's Rules
- Data Modeling
- Conceptual, Physical And Logical Database Models
- Database Design
- Design Constraints
- Functional Dependencies
- Normalization
- First Normal Form (1nf)
- Second Normal Form (2nf)
- Third Normal Form (3nf)
- Boyce-codd Normal Form (bcnf)
- Fourth Normal Form (4nf)
- Fifth Normal Form (5nf)
- Domain-key Normal Form (dknf)
- Denormalization
- Rdbms In Db2
- History Of Db2
- Db2's Predecessors
- Benefits Of Db2
- Environment
- Major Components Of Db2
- Dbrms, Bind, Plans, And The Optimizer
- Structured Query Language
- Characteristics Of Sql
- The Advantages Of Sql
- Types Of Sql
- Basic Db2 Objects And Operators
- Advanced Sql Topics
- Update Operations
- What Are Aggregate Functions
- Subqueries-selegt Statements
- Joins Statement
- Union Operation
- Views
- Sql - Tips, Tricks And Tools
- Data Security
- User Identification
- Security Authorizations
- Table, Plan, Database, System And Use Privileges
- Views And Security
- Grant And Revoke
- Part I - Using Db2 In An Application Program
- Part Ii - Dynamic Sql Programming
- Part Iii - Program Preparation
- Part Iv - Db2 And Tso
- Part V - Db2 And Cics
- Relational Databases
- Db2 Objects
- Part Ii - The Optimizer
- Part Iii - Db2 Catalog And Directory
- Part Iv - Data Locking
- Query Management Facility
- Qmf Overview
- Temporary And Permanent Objects
- Qmf Commands
- Db2i
- Performance Monitoring
- Db2 Utilities And Commands
- Db2 Restart And Recovery Scenarios
- Moverview Of Management Information System(mis)
- Terminology And Concepts
- Database Hierarchies
- Dbds, Psbs And Acbs
- Dl-i Calls
- Segment Search Arguments (ssas)
- Command Codes
- Dl-i Call Formats
- What Ims Returns To Your Program
- Status Codes
- Cobol Overview
- History Of Cobol
- Vs Cobol Ii And Productivity Improvement
- Features Of Vs Cobol Ii
- Application Developments
- Structured Programming
- 31-bit Addressing
- Overview Of Program Design
- Design Documentation
- The Identification Division
- The Environment Division
- Data Division
- Procedure Division
- Structured Programming Practices
- Controlling Program Flow In Vs Cobol Ii
- Coding Decisions
- Conditional Statements
- Numeric Data
- Arithmetic Computations
- Nonnumeric Data Manipulation
- Dbcs Data Manipulation
- Concepts And Coding Techniques
- Defining A Table
- Putting Values In A Table
- Creating Variable-length Tables
- Searching A Table
- Efficient Coding For Tables
- Reference Modification
- Reading And Writing Data
- File Availability
- Automatic Closing Of Files
- Input-output Error Handling Techniques
- The Checkpoint-restart Feature
- Sort Or Merge Operations
- Describing The Files
- Specifying The Sort Criteria
- Coding The Input Procedure
- Coding The Output Procedure
- Improving Sort Performance With Fastsrt
- Sorting Variable-length Records
- Passing Control Statements To Dfsort
- Sort Special Registers
- Sorting Under Cics
- Using Subprograms
- Reentrant Programs
- Calls Between Vs Cobol Ii And Other Languages
- Link-editing Programs That Use Calls
- Cics
- Ims
- Db2 Or Sql-ds
- Interactive System Productivity Facility (ispf)
- Methods Of Compilation
- Compiling Under Mvs
- Compiling Under Tso
- Controlling Your Compilation
- Compiler Option Descriptions
- Results Of Compilation
- Overview Of Link-editing
- Creating A Load Module
- Link-edit Options
- Detecting Link-edit Errors
- Re-link-editing Load Modules With Nores Programs
- Basic Execution
- Run-time Options
- Combined Compile, Link-edit, And Execute
- Mixing Res And Nores Programs With Mixres
- Run-time Errors
- Run-time Messages
- Debugging Aids
- Cobol Copy Library
- Job Processing
- Cataloged Procedures
- Mvs-xa And Mvs-esa System Services
- Cobol Basics
- Coding Techniques And Considerations
- Optimization
- Options And Tuning Considerations
- Programmer Productivity
- Error Handling Techniques
Introduction To Software Development
Introduction To Ibm Mainframes
Mvs Concepts
Tso And Ispf
Jes2, ]es3 And Sms
Introduction To Job Control Language (jcl)
The Job Statement
The Exec Statement
The Job And Exec Statements
The Dd Statement
Procedures And Symbolic Parameters
Generation Data Groups (gdg), Compile/link-edit And Run Jcls
Ibm Utilities
Sam Basics
Access Method Services (ams)
Alternate Index
Additional Vsam Commands
Vsam Tuning
Introduction To Rexx
Overview Of Rexx
Introduction To Cics
Exception Handling In Cics
Program Control
File Control
Terminal Control
Developing A Cics Application
Cics Programming Techniques
Basic Mapping Support (bms)
Transient Data Control
Temporary Storage Control
Interval And Task Control
Cics Application Design
Recovery And Restart
System Security And Intersystem Communication
Cics Debugging Facilities And Techniques
Bms Map Definition Macros And Copylib Members
Cics Response And Abend Codes
Data, Information And Information Processing
Introduction To Database Management Systems
Introduction To Relational Database Management Systems
Database Architecture And Data Modeling
Data Normalization
Overview Of Db2
Structured Query Language (sql)
Data Security And Access
Db2 Application Development
Db2 Internals
Qmf And Db2i
Db2 Performance Monitoring, Utilities And Recovery/restart
Overview Of Information Management System (ims)
Introduction To Vs Cobol Ii
Overview Of Application Development In Vs Cobol Ii
Overview Of The Cobol Program
Data Manipulation
Table Handling
Reference Modification
Input/output Coding
Sorting And Merging Files
Subprogram Linkage
Coding Cobol Programs That Run Under Cics. Ims, Db2 And Ispf
Compiling The Program
Link-editing The Program
Executing The Program
Improving Program Performance
