What types of subevent retrieval operations are available?

Retrieval types include data retrieval (subevent data, metadata, attributes, context), status retrieval (status, state, progress, completion), relationship retrieval (parent, sibling, child, dependency), and processing retrieval (history, results, errors, metrics).

How do I handle errors with CICS RETRIEVE SUBEVENT?

Always check the response code and implement appropriate error handling, including validation of subevent existence, proper handling of retrieval errors, and authorization checks.

What is the purpose of subevent retrieval?

Subevent retrieval enables access to subevent data, status monitoring, relationship tracking, and processing information for comprehensive subevent oversight.

When should I use CICS RETRIEVE SUBEVENT?

Use this command when you need to retrieve subevent information, monitor subevent status, access subevent data, or manage subevent relationships in CICS applications.

CICS RETRIEVE SUBEVENT - Subevent Retrieval Operations

Q: What is CICS RETRIEVE SUBEVENT command used for?

CICS RETRIEVE SUBEVENT is used to retrieve subevent information, manage subevent data, and handle subevent operations in CICS applications for subevent monitoring and management.

CICS RETRIEVE SUBEVENT provides subevent retrieval capabilities in CICS environments. It enables programs to retrieve subevent information, manage subevent data, and handle subevent operations in CICS applications.

What is CICS RETRIEVE SUBEVENT?

CICS RETRIEVE SUBEVENT is a command that allows programs to retrieve subevent information, manage subevent data, and handle subevent operations in CICS environments. It provides subevent retrieval capabilities, data management, and subevent handling for CICS applications.

Command Syntax

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EXEC CICS RETRIEVE SUBEVENT
    [EVENTID(event-id)]
    [SUBEVENTID(subevent-id)]
    [INTO(data-area)]
    [LENGTH(data-length)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

EVENTID - Event identifier containing the subevent
SUBEVENTID - Subevent identifier to retrieve
INTO - Data area to receive subevent information
LENGTH - Length of data to retrieve
RESP - Response code variable

Subevent Retrieval Types

Data Retrieval

Retrieve subevent data information

• SUBEVENT DATA - Retrieve the actual data stored in the subevent
• SUBEVENT METADATA - Retrieve metadata and descriptive information about the subevent
• SUBEVENT ATTRIBUTES - Retrieve attributes and properties of the subevent
• SUBEVENT CONTEXT - Retrieve context and environmental information about the subevent

Status Retrieval

Retrieve subevent status information

• SUBEVENT STATUS - Retrieve the current status of the subevent
• SUBEVENT STATE - Retrieve the current state of the subevent
• SUBEVENT PROGRESS - Retrieve the progress information of the subevent
• SUBEVENT COMPLETION - Retrieve completion status and results of the subevent

Relationship Retrieval

Retrieve subevent relationship information

• PARENT EVENT RELATIONSHIP - Retrieve information about the parent event relationship
• SIBLING SUBEVENT RELATIONSHIP - Retrieve information about sibling subevent relationships
• CHILD SUBEVENT RELATIONSHIP - Retrieve information about child subevent relationships
• DEPENDENCY RELATIONSHIP - Retrieve information about subevent dependencies and relationships

Processing Retrieval

Retrieve subevent processing information

• PROCESSING HISTORY - Retrieve the processing history and timeline of the subevent
• PROCESSING RESULTS - Retrieve the results and outcomes of subevent processing
• PROCESSING ERRORS - Retrieve error information and error handling details
• PROCESSING METRICS - Retrieve performance metrics and processing statistics

Programming Examples

Basic Subevent Retrieval

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. RETRIEVE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT001'.
       01  SUBEVENT-ID      PIC X(8) VALUE 'SUB001'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS RETRIEVE SUBEVENT
               EVENTID(EVENT-ID)
               SUBEVENTID(SUBEVENT-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Subevent retrieved successfully'
               DISPLAY 'Event ID: ' EVENT-ID
               DISPLAY 'Subevent ID: ' SUBEVENT-ID
               DISPLAY 'Data length: ' DATA-LENGTH
           ELSE
               DISPLAY 'Failed to retrieve subevent'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Subevent Status Retrieval

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. RETRIEVE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT002'.
       01  SUBEVENT-ID      PIC X(8) VALUE 'SUB002'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       01  SUBEVENT-STATUS  PIC X(10).
       
       PROCEDURE DIVISION.
           EXEC CICS RETRIEVE SUBEVENT
               EVENTID(EVENT-ID)
               SUBEVENTID(SUBEVENT-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               MOVE DATA-AREA(1:10) TO SUBEVENT-STATUS
               DISPLAY 'Subevent Status: ' SUBEVENT-STATUS
               
               EVALUATE SUBEVENT-STATUS
                   WHEN 'ACTIVE'
                       DISPLAY 'Subevent is currently active'
                   WHEN 'PENDING'
                       DISPLAY 'Subevent is pending processing'
                   WHEN 'COMPLETED'
                       DISPLAY 'Subevent has been completed'
                   WHEN 'FAILED'
                       DISPLAY 'Subevent has failed'
                   WHEN OTHER
                       DISPLAY 'Unknown subevent status'
               END-EVALUATE
           ELSE
               DISPLAY 'Failed to retrieve subevent status'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Subevent Retrieval

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. RETRIEVE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT003'.
       01  SUBEVENT-ID      PIC X(8) VALUE 'SUB003'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS RETRIEVE SUBEVENT
               EVENTID(EVENT-ID)
               SUBEVENTID(SUBEVENT-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Subevent retrieved successfully'
                   DISPLAY 'Event ID: ' EVENT-ID
                   DISPLAY 'Subevent ID: ' SUBEVENT-ID
               WHEN DFHRESP(NOTFND)
                   DISPLAY 'Subevent not found'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid retrieval request'
               WHEN DFHRESP(EVENTERR)
                   DISPLAY 'Event-specific error occurred'
               WHEN DFHRESP(SUBEVENTERR)
                   DISPLAY 'Subevent-specific error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Subevent Retrieval Management

Retrieval State Management

• Retrieval State Tracking - Track the current state of retrieval operations
• Retrieval State Maintenance - Maintain retrieval state across operations
• Retrieval Context Management - Manage retrieval context and environment
• Retrieval Session Management - Manage retrieval session lifecycle

Subevent Management

• Subevent Data Management - Manage subevent data during retrieval operations
• Subevent State Management - Manage subevent state during retrieval operations
• Subevent Metadata Management - Manage subevent metadata during retrieval operations
• Subevent Access Management - Manage subevent access during retrieval operations

Event Management

• Event Context Management - Manage event context during subevent retrieval
• Event State Management - Manage event state during subevent retrieval
• Event Relationship Management - Manage event relationships during subevent retrieval
• Event Processing Management - Manage event processing during subevent retrieval

Error Management

• Error Detection - Detect errors during retrieval operations
• Error Recovery - Recover from retrieval operation errors
• Error Reporting - Report retrieval operation errors
• Error Prevention - Prevent future retrieval operation errors

Error Handling

Common Response Codes

DFHRESP(NORMAL) - Subevent retrieved successfully
DFHRESP(NOTFND) - Subevent not found
DFHRESP(INVREQ) - Invalid retrieval request
DFHRESP(EVENTERR) - Event-specific error
DFHRESP(SUBEVENTERR) - Subevent-specific error
DFHRESP(AUTHORITYERR) - Authorization error

Performance Considerations

Retrieval Efficiency

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

Resource Impact

• Monitor resource usage - Track how retrieval operations consume system resources
• Optimize resource allocation - Ensure efficient allocation of resources for retrieval
• Manage resource cleanup - Properly clean up resources after retrieval operations
• Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Subevent Retrieval Best Practices

• Always check response codes
• Use appropriate retrieval parameters
• Implement proper error handling
• Ensure proper retrieval state management
• Validate retrieval operations
• Optimize retrieval operations
• Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS RETRIEVE SUBEVENT like getting a small part of a big story:

• Story Name: "Which big story to look in" - The event ID
• Small Part Name: "Which small part to get" - The subevent ID
• Get the Part: "Get the small part of the story" - Retrieve subevent
• Read the Part: "Read what's in the small part" - Access subevent data
• Understand: "Understand what the small part means" - Process subevent information

Exercises

Exercise 1: Basic Subevent Retrieval

Create a program that retrieves subevent information using RETRIEVE SUBEVENT.

Exercise 2: Subevent Status Retrieval

Write a program that retrieves subevent status and processes different status values.

Exercise 3: Error Handling

Implement comprehensive error handling for subevent retrieval failures and invalid subevent IDs.

CICS RETRIEVE SUBEVENT - Subevent Retrieval Operations

What is CICS RETRIEVE SUBEVENT?

Command Syntax

Parameters

Optional Parameters

Subevent Retrieval Types

Data Retrieval

Status Retrieval

Relationship Retrieval

Processing Retrieval

Programming Examples

Basic Subevent Retrieval

Subevent Status Retrieval

Error Handling with Subevent Retrieval

Subevent Retrieval Management

Retrieval State Management

Subevent Management

Event Management

Error Management

Error Handling

Common Response Codes

Performance Considerations

Retrieval Efficiency

Resource Impact

Best Practices

Subevent Retrieval Best Practices

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Basic Subevent Retrieval

Exercise 2: Subevent Status Retrieval

Exercise 3: Error Handling

Related Concepts

Event Management

Subevent Management

Event Processing

Data Retrieval

Error Handling

Related Pages