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CICS REMOVE - Remove

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

What is CICS REMOVE?

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

Command Syntax

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EXEC CICS REMOVE
    [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 remove 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

Remove Types

1. Basic Removes

  • Basic removes: Standard remove operations that handle simple removing without special formatting
  • Mapped removes: Remove operations that use predefined field mappings to structure remove data
  • Unmapped removes: Raw remove operations that handle unstructured removing without predefined field mappings
  • Custom removes: Specialized remove operations designed for specific application requirements

2. Advanced Removes

  • Advanced removes: Complex remove operations that handle sophisticated removing processing and validation
  • Secure removes: Remove operations that include encryption and security features for sensitive removing
  • Encrypted removes: Remove operations that automatically encrypt remove data
  • Compressed removes: Remove operations that handle compressed removing streams and automatically compress remove data

3. Specialized Removes

  • Specialized removes: Remove operations tailored for specific protocols or communication methods
  • High-performance removes: Optimized remove operations designed for maximum throughput and efficiency
  • Low-latency removes: Remove operations optimized for minimal delay and real-time processing requirements
  • High-throughput removes: Remove operations designed to handle large volumes of removing 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.
    * Remove operation
    EXEC CICS REMOVE
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('REMOVE command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Remove operation completed successfully
    * Continue processing

Remove Processing

1. Remove Preparation

Remove preparation includes:

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

2. Remove Transmission

Remove transmission includes:

  • Remove routing - directing remove data to the appropriate processing location
  • Remove delivery - ensuring remove data reaches the correct destination within the application
  • Transmission confirmation - verifying that remove 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 remove data for presentation or further processing
  • User experience - ensuring smooth data flow and responsive application behavior
  • Performance optimization - maximizing remove efficiency and minimizing resource usage

Common Response Codes

Success Response Codes

  • NORMAL (0): Remove operation completed successfully - removing was completed without errors
  • REMOVE (4): Remove operation completed - operation completed with remove-specific status

Error Response Codes

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

Best Practices

1. Remove Preparation

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

2. Error Handling

  • Check all response codes - always examine both RESP and RESP2 for complete error information
  • Handle remove failures - implement appropriate recovery mechanisms for failed remove 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 remove operations - reduce unnecessary remove calls to improve overall performance
  • Use efficient remove 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 remove operations

Explain It Like I'm 5 Years Old

Imagine you're taking a toy out of a toy box:

When you want to take a toy out of a toy box, you reach in and take it out. If you take the toy out, it's not in the box anymore. If you don't take the toy out, it stays in the box.

CICS REMOVE is like taking a toy out of a toy box. The computer program reaches in and takes data out. If it takes the data out, it's not there anymore. If it doesn't take the data out, it stays there.

Just like you take toys out of toy boxes, the computer program takes data out of memory!

Exercises

Exercise 1: Remove Operation

Write a CICS REMOVE command to perform a remove operation.

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

Exercise 2: Remove Processing

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

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

Quiz

Question 1

What is the primary purpose of CICS REMOVE?

Answer: B) To provide remove management capabilities

Question 2

Which parameter specifies the response code?

Answer: A) RESP

Related Concepts

CICS Remove Processing

Remove processing and output in CICS

CICS User Management

User management and user interaction in CICS

CICS Output Processing

Output processing and remove display in CICS