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CICS LOAD - Load

CICS LOAD provides load management capabilities, enabling load processing and output processing in CICS environments. It provides efficient load capabilities for CICS applications.

What is CICS LOAD?

CICS LOAD provides load management capabilities, enabling load processing and output processing. It provides efficient load capabilities, allowing applications to manage load operations.

Command Syntax

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EXEC CICS LOAD
    [RESP(response-code)]
    [RESP2(response-code-2)]
END-EXEC.

Parameters Explained

RESP Parameters

Response codes returned by the command:

  • RESP: Primary response code - indicates the success or failure of the load operation
  • RESP2: Secondary response code - provides additional error information when RESP indicates failure
  • Always check these codes for command success before proceeding with data processing
  • Handle command failures appropriately to prevent application errors

Load Types

1. Basic Loads

  • Basic loads: Standard load operations that handle simple loading without special formatting
  • Mapped loads: Load operations that use predefined field mappings to structure load data
  • Unmapped loads: Raw load operations that handle unstructured loading without predefined field mappings
  • Custom loads: Specialized load operations designed for specific application requirements

2. Advanced Loads

  • Advanced loads: Complex load operations that handle sophisticated loading processing and validation
  • Secure loads: Load operations that include encryption and security features for sensitive loading
  • Encrypted loads: Load operations that automatically encrypt load data
  • Compressed loads: Load operations that handle compressed loading streams and automatically compress load data

3. Specialized Loads

  • Specialized loads: Load operations tailored for specific protocols or communication methods
  • High-performance loads: Optimized load operations designed for maximum throughput and efficiency
  • Low-latency loads: Load operations optimized for minimal delay and real-time processing requirements
  • High-throughput loads: Load operations designed to handle large volumes of loading efficiently

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
 
PROCEDURE DIVISION.
    * Load operation
    EXEC CICS LOAD
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('LOAD command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Load operation completed successfully
    * Continue processing

Load Processing

1. Load Preparation

Load preparation includes:

  • Load validation - ensuring the load operation is properly configured and authorized
  • Load formatting - preparing data structures and buffers for load data
  • Load encoding - setting up proper character encoding and data transformation
  • Load processing - initializing the load operation and preparing for loading

2. Load Transmission

Load transmission includes:

  • Load routing - directing load data to the appropriate processing location
  • Load delivery - ensuring load data reaches the correct destination within the application
  • Transmission confirmation - verifying that load was completed successfully
  • Error handling - managing transmission failures and implementing retry mechanisms

3. Output Management

Output management includes:

  • User management - handling user sessions and maintaining connection state
  • Output formatting - structuring load data for presentation or further processing
  • User experience - ensuring smooth data flow and responsive application behavior
  • Performance optimization - maximizing load efficiency and minimizing resource usage

Common Response Codes

Success Response Codes

  • NORMAL (0): Load operation completed successfully - loading was completed without errors
  • LOAD (4): Load operation completed - operation completed with load-specific status

Error Response Codes

  • INVREQ (16): Invalid request - the load operation parameters are incorrect or unauthorized
  • NOTFND (20): Resource not found - the specified load resource does not exist
  • LENGERR (22): Length error - the load data length exceeds expected limits
  • LOAD (24): Load error - a load-specific error occurred during the operation

Best Practices

1. Load Preparation

  • Prepare load appropriately - ensure all necessary resources and configurations are in place
  • Validate load content - verify that load data meets expected format and quality standards
  • Handle different load types - implement flexible processing to accommodate various loading formats
  • Ensure load integrity - maintain data consistency and prevent corruption during loading

2. Error Handling

  • Check all response codes - always examine both RESP and RESP2 for complete error information
  • Handle load failures - implement appropriate recovery mechanisms for failed load operations
  • Implement retry logic - provide automatic retry capabilities for transient failures
  • Log error conditions - maintain detailed logs for troubleshooting and monitoring purposes

3. Performance Optimization

  • Minimize load operations - reduce unnecessary load calls to improve overall performance
  • Use efficient load formats - choose appropriate data formats to minimize processing overhead
  • Optimize user updates - streamline user interface updates to reduce response time
  • Manage user resources - efficiently allocate and manage system resources for load operations

Explain It Like I'm 5 Years Old

Imagine you're loading toys into a toy box:

When you want to load toys into a toy box, you take each toy and put it inside the box. If you put all the toys in the box, the box is loaded. If you don't put all the toys in the box, the box is not loaded.

CICS LOAD is like loading toys into a toy box. The computer program takes each piece of data and puts it inside the memory. If it puts all the data in the memory, the memory is loaded. If it doesn't put all the data in the memory, the memory is not loaded.

Just like you load toys into a toy box, the computer program loads data into memory!

Exercises

Exercise 1: Load Operation

Write a CICS LOAD command to perform a load operation.

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EXEC CICS LOAD
    RESP(WS-RESPONSE)
    RESP2(WS-RESPONSE2)
END-EXEC.

Exercise 2: Load Processing

How would you implement comprehensive load processing that handles different load types and requirements?

Answer: Identify different load types and appropriate handling, implement load validation and encoding, handle different load types and capabilities, implement proper error handling for load failures, optimize load operations for performance, and maintain load integrity throughout the process.

Quiz

Question 1

What is the primary purpose of CICS LOAD?

Answer: B) To provide load management capabilities

Question 2

Which parameter specifies the response code?

Answer: A) RESP

Related Concepts

CICS Load Processing

Load processing and output in CICS

CICS User Management

User management and user interaction in CICS

CICS Output Processing

Output processing and load display in CICS