What types of event deletion are available?

Deletion types include normal deletion (graceful, safe, ordered, validated), forced deletion (immediate, emergency, abrupt, override), conditional deletion (conditional, state-based, dependency, resource), and batch deletion (batch, group, category, pattern).

How do I handle errors with CICS DELETE EVENT?

Always check the response code and implement appropriate error handling, including validation of event existence, proper handling of deletion errors, and resource cleanup on deletion failures.

What is the purpose of event deletion?

Event deletion removes events from the system, cleans up associated resources, frees memory and other resources, and maintains system efficiency by removing unused or completed events.

When should I use CICS DELETE EVENT?

Use this command when you need to remove events, clean up resources, free system resources, or maintain system efficiency by removing unused or completed events.

CICS DELETE EVENT - Event Deletion and Cleanup

Q: What is CICS DELETE EVENT command used for?

CICS DELETE EVENT is used to delete events, clean up event resources, and remove event definitions from CICS applications for event management and cleanup.

CICS DELETE EVENT provides event deletion and cleanup capabilities in CICS environments. It enables programs to delete events, clean up event resources, and remove event definitions from CICS applications.

What is CICS DELETE EVENT?

CICS DELETE EVENT is a command that allows programs to delete events, clean up event resources, and remove event definitions from CICS environments. It provides event deletion capabilities, resource cleanup, and event removal for CICS applications.

Command Syntax

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EXEC CICS DELETE EVENT
    EVENTID(event-id)
    [FORCE(force-option)]
    [CLEANUP(cleanup-option)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

EVENTID - Identifier of the event to delete

Optional Parameters

FORCE - Force deletion option
CLEANUP - Resource cleanup option
RESP - Response code variable

Event Deletion Types

Normal Deletion

Standard deletion with proper cleanup

• GRACEFUL DELETION - Events deleted after completing current operations
• SAFE DELETION - Events deleted only when safe to do so
• ORDERED DELETION - Events deleted in proper dependency order
• VALIDATED DELETION - Events deleted only after validation checks

Forced Deletion

Immediate deletion without waiting

• IMMEDIATE DELETION - Events deleted immediately without waiting
• EMERGENCY DELETION - Events deleted in emergency situations
• ABRUPT DELETION - Events deleted abruptly without cleanup
• OVERRIDE DELETION - Events deleted despite warnings or errors

Conditional Deletion

Deletion based on specific conditions

• CONDITIONAL DELETION - Events deleted only when conditions are met
• STATE-BASED DELETION - Events deleted based on their current state
• DEPENDENCY DELETION - Events deleted based on dependency status
• RESOURCE DELETION - Events deleted based on resource availability

Batch Deletion

Deletion of multiple events

• BATCH DELETION - Multiple events deleted in a single operation
• GROUP DELETION - Related events deleted as a group
• CATEGORY DELETION - Events deleted by category or type
• PATTERN DELETION - Events deleted based on naming patterns

Programming Examples

Basic Event Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT001'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE EVENT
               EVENTID(EVENT-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Event deleted successfully'
           ELSE
               DISPLAY 'Failed to delete event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Forced Event Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT002'.
       01  FORCE-OPTION     PIC X(4) VALUE 'YES'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE EVENT
               EVENTID(EVENT-ID)
               FORCE(FORCE-OPTION)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Event force deleted'
               DISPLAY 'Event ID: ' EVENT-ID
               DISPLAY 'Force option: ' FORCE-OPTION
           ELSE
               DISPLAY 'Failed to force delete event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Event Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT003'.
       01  CLEANUP-OPTION   PIC X(4) VALUE 'YES'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE EVENT
               EVENTID(EVENT-ID)
               CLEANUP(CLEANUP-OPTION)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Event deleted successfully'
                   DISPLAY 'Event ID: ' EVENT-ID
               WHEN DFHRESP(NOTFND)
                   DISPLAY 'Event not found'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid deletion request'
               WHEN DFHRESP(EVENTERR)
                   DISPLAY 'Event-specific error occurred'
               WHEN DFHRESP(DELETEERR)
                   DISPLAY 'Deletion-specific error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Event Cleanup

Data Cleanup

• Event Data Removal - Remove all data associated with the event
• Metadata Cleanup - Clean up event metadata and attributes
• Index Cleanup - Remove indexes associated with the event
• Reference Cleanup - Clear references to the event data

Resource Cleanup

• Memory Cleanup - Release memory allocated to the event
• Storage Cleanup - Release storage space used by the event
• Buffer Cleanup - Clean up buffers used by the event
• Cache Cleanup - Clear cache entries for the event

Handler Cleanup

• Handler Removal - Remove event handlers associated with the event
• Callback Cleanup - Clean up callback functions for the event
• Listener Cleanup - Remove event listeners for the event
• Subscriber Cleanup - Remove event subscribers for the event

System Cleanup

• System References - Remove system references to the event
• Registry Cleanup - Remove event from system registry
• Monitoring Cleanup - Remove event from monitoring systems
• Audit Cleanup - Update audit logs after event deletion

Error Handling

Common Response Codes

DFHRESP(NORMAL) - Event deleted successfully
DFHRESP(NOTFND) - Event not found
DFHRESP(INVREQ) - Invalid deletion request
DFHRESP(EVENTERR) - Event-specific error
DFHRESP(DELETEERR) - Deletion-specific error
DFHRESP(CLEANUPERR) - Cleanup-specific error

Performance Considerations

Deletion Efficiency

• Optimize deletion operations - Use appropriate deletion methods for different event types
• Minimize deletion overhead - Reduce the computational cost of deletion operations
• Use efficient deletion patterns - Implement deletion strategies that minimize resource usage
• Monitor deletion performance - Track the performance impact of deletion operations

Resource Impact

• Monitor resource usage - Track how deletion operations consume system resources
• Optimize resource cleanup - Ensure efficient cleanup of resources during deletion
• Manage resource recovery - Properly recover resources after deletion operations
• Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Event Deletion Best Practices

• Always check response codes
• Use appropriate deletion parameters
• Implement proper error handling
• Ensure proper resource cleanup
• Validate event state before deletion
• Optimize deletion operations
• Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS DELETE EVENT like canceling a party:

• Party Name: "Which party to cancel" - The event ID
• Cancel Method: "How to cancel it" - The cleanup option
• Force Cancel: "Cancel it right now" - The force option
• Clean Up: "Put everything away" - Resource cleanup
• All Done: "Party is completely canceled" - Event deleted

Exercises

Exercise 1: Basic Event Deletion

Create a program that deletes a basic event with standard parameters.

Exercise 2: Forced Deletion

Write a program that performs forced deletion of an event.

Exercise 3: Error Handling

Implement comprehensive error handling for event deletion failures and cleanup errors.

CICS DELETE EVENT - Event Deletion and Cleanup

What is CICS DELETE EVENT?

Command Syntax

Parameters

Required Parameters

Optional Parameters

Event Deletion Types

Normal Deletion

Forced Deletion

Conditional Deletion

Batch Deletion

Programming Examples

Basic Event Deletion

Forced Event Deletion

Error Handling with Event Deletion

Event Cleanup

Data Cleanup

Resource Cleanup

Handler Cleanup

System Cleanup

Error Handling

Common Response Codes

Performance Considerations

Deletion Efficiency

Resource Impact

Best Practices

Event Deletion Best Practices

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Basic Event Deletion

Exercise 2: Forced Deletion

Exercise 3: Error Handling

Related Concepts

Event Management

Resource Cleanup

Event Handlers

Event Processing

Error Handling

Related Pages