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CICS PERFORM - Perform

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

What is CICS PERFORM?

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

Command Syntax

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EXEC CICS PERFORM
    [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 perform 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

Perform Types

1. Basic Performs

  • Basic performs: Standard perform operations that handle simple performing without special formatting
  • Mapped performs: Perform operations that use predefined field mappings to structure perform data
  • Unmapped performs: Raw perform operations that handle unstructured performing without predefined field mappings
  • Custom performs: Specialized perform operations designed for specific application requirements

2. Advanced Performs

  • Advanced performs: Complex perform operations that handle sophisticated performing processing and validation
  • Secure performs: Perform operations that include encryption and security features for sensitive performing
  • Encrypted performs: Perform operations that automatically encrypt perform data
  • Compressed performs: Perform operations that handle compressed performing streams and automatically compress perform data

3. Specialized Performs

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

Perform Processing

1. Perform Preparation

Perform preparation includes:

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

2. Perform Transmission

Perform transmission includes:

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

Common Response Codes

Success Response Codes

  • NORMAL (0): Perform operation completed successfully - performing was completed without errors
  • PERFORM (4): Perform operation completed - operation completed with perform-specific status

Error Response Codes

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

Best Practices

1. Perform Preparation

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

2. Error Handling

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

Explain It Like I'm 5 Years Old

Imagine you're doing a dance:

When you do a dance, you move your body and follow the steps. If you do the dance correctly, you look good. If you don't do the dance correctly, you don't look good.

CICS PERFORM is like doing a dance. The computer program moves data and follows the steps. If it does the dance correctly, it works well. If it doesn't do the dance correctly, it doesn't work well.

Just like you do dances, the computer program does data dances!

Exercises

Exercise 1: Perform Operation

Write a CICS PERFORM command to perform a perform operation.

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

Exercise 2: Perform Processing

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

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

Quiz

Question 1

What is the primary purpose of CICS PERFORM?

Answer: B) To provide perform management capabilities

Question 2

Which parameter specifies the response code?

Answer: A) RESP

Related Concepts

CICS Perform Processing

Perform processing and output in CICS

CICS User Management

User management and user interaction in CICS

CICS Output Processing

Output processing and perform display in CICS