What types of timer 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 TIMER?

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

What is the purpose of timer deletion?

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

When should I use CICS DELETE TIMER?

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

CICS DELETE TIMER - Timer Deletion and Cleanup

Q: What is CICS DELETE TIMER command used for?

CICS DELETE TIMER is used to delete timers, clean up timer resources, and remove timer definitions from CICS applications for timer management and cleanup.

CICS DELETE TIMER provides timer deletion and cleanup capabilities in CICS environments. It enables programs to delete timers, clean up timer resources, and remove timer definitions from CICS applications.

What is CICS DELETE TIMER?

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

Command Syntax

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EXEC CICS DELETE TIMER
    TIMERID(timer-id)
    [FORCE(force-option)]
    [CLEANUP(cleanup-option)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

TIMERID - Identifier of the timer to delete

Optional Parameters

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

Timer Deletion Types

Normal Deletion

Standard deletion with proper cleanup

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

Forced Deletion

Immediate deletion without waiting

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

Conditional Deletion

Deletion based on specific conditions

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

Batch Deletion

Deletion of multiple timers

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

Programming Examples

Basic Timer Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  TIMER-ID         PIC X(8) VALUE 'TIMER01'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE TIMER
               TIMERID(TIMER-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Timer deleted successfully'
           ELSE
               DISPLAY 'Failed to delete timer'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Forced Timer Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  TIMER-ID         PIC X(8) VALUE 'TIMER02'.
       01  FORCE-OPTION     PIC X(4) VALUE 'YES'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE TIMER
               TIMERID(TIMER-ID)
               FORCE(FORCE-OPTION)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Timer force deleted'
               DISPLAY 'Timer ID: ' TIMER-ID
               DISPLAY 'Force option: ' FORCE-OPTION
           ELSE
               DISPLAY 'Failed to force delete timer'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Timer Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  TIMER-ID         PIC X(8) VALUE 'TIMER03'.
       01  CLEANUP-OPTION   PIC X(4) VALUE 'YES'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE TIMER
               TIMERID(TIMER-ID)
               CLEANUP(CLEANUP-OPTION)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Timer deleted successfully'
                   DISPLAY 'Timer ID: ' TIMER-ID
               WHEN DFHRESP(NOTFND)
                   DISPLAY 'Timer not found'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid deletion request'
               WHEN DFHRESP(TIMERERR)
                   DISPLAY 'Timer-specific error occurred'
               WHEN DFHRESP(DELETEERR)
                   DISPLAY 'Deletion-specific error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Timer Cleanup

Data Cleanup

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

Resource Cleanup

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

Handler Cleanup

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

System Cleanup

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

Error Handling

Common Response Codes

DFHRESP(NORMAL) - Timer deleted successfully
DFHRESP(NOTFND) - Timer not found
DFHRESP(INVREQ) - Invalid deletion request
DFHRESP(TIMERERR) - Timer-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 timer 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

Timer Deletion Best Practices

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

Explain It Like I'm 5 Years Old

Think of CICS DELETE TIMER like turning off an alarm clock:

• Alarm Name: "Which alarm to turn off" - The timer ID
• Turn Off Method: "How to turn it off" - The cleanup option
• Force Turn Off: "Turn it off right now" - The force option
• Clean Up: "Put everything away" - Resource cleanup
• All Done: "Alarm is completely off" - Timer deleted

Exercises

Exercise 1: Basic Timer Deletion

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

Exercise 2: Forced Deletion

Write a program that performs forced deletion of a timer.

Exercise 3: Error Handling

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

CICS DELETE TIMER - Timer Deletion and Cleanup

What is CICS DELETE TIMER?

Command Syntax

Parameters

Required Parameters

Optional Parameters

Timer Deletion Types

Normal Deletion

Forced Deletion

Conditional Deletion

Batch Deletion

Programming Examples

Basic Timer Deletion

Forced Timer Deletion

Error Handling with Timer Deletion

Timer Cleanup

Data Cleanup

Resource Cleanup

Handler Cleanup

System Cleanup

Error Handling

Common Response Codes

Performance Considerations

Deletion Efficiency

Resource Impact

Best Practices

Timer Deletion Best Practices

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Basic Timer Deletion

Exercise 2: Forced Deletion

Exercise 3: Error Handling

Related Concepts

Timer Management

Resource Cleanup

Timer Handlers

Timer Processing

Error Handling

Related Pages