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CICS ISSUE EODS - End of Data Set Signal

CICS ISSUE EODS provides end of data set signaling capabilities for programs and transactions. It enables programs to signal end of data set, manage data set completion, and handle data set processing in CICS environments.

What is CICS ISSUE EODS?

CICS ISSUE EODS is a command that allows programs to signal the end of a data set in the system. It provides end of data set signaling capabilities, data set completion management, and data set processing for CICS applications.

Command Syntax

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EXEC CICS ISSUE EODS
    [DATASET(dataset-name)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

  • DATASET(dataset-name) - Name of data set to signal end
  • RESP(response-code) - Response code variable

Data Set Types

Sequential Data Sets

Sequential data set types

  • • QSAM FILES - Queued Sequential Access Method files
  • • BSAM FILES - Basic Sequential Access Method files
  • • BDAM FILES - Basic Direct Access Method files
  • • ISAM FILES - Indexed Sequential Access Method files

VSAM Data Sets

VSAM data set types

  • • KSDS - Key Sequenced Data Sets
  • • ESDS - Entry Sequenced Data Sets
  • • RRDS - Relative Record Data Sets
  • • LDS - Linear Data Sets

Temporary Data Sets

Temporary data set types

  • • TEMP DATA SETS - Temporary data sets
  • • WORK DATA SETS - Work data sets
  • • SCRATCH DATA SETS - Scratch data sets
  • • SPOOL DATA SETS - Spool data sets

System Data Sets

System data set types

  • • SYSTEM DATA SETS - System data sets
  • • CATALOG DATA SETS - Catalog data sets
  • • VTOC DATA SETS - Volume Table of Contents data sets
  • • PDS DATA SETS - Partitioned Data Sets

Programming Examples

Basic End of Data Set Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEEODS01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATASET-NAME PIC X(8) VALUE 'MYFILE01'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Signaling end of data set'
           DISPLAY 'Data set: ' DATASET-NAME
           
           EXEC CICS ISSUE EODS
               DATASET(DATASET-NAME)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'End of data set signaled successfully'
           ELSE
               DISPLAY 'End of data set signal failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced Data Set Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEEODS02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATASET-NAME PIC X(8).
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  SIGNAL-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-SIGNALS PIC S9(2) COMP VALUE 3.
       01  DS-STATUS PIC X(1).
       01  DATASET-LIST.
           05  DS-ITEM OCCURS 3 TIMES.
               10  DS-ID PIC X(8).
               10  DS-TYPE PIC X(8).
               10  DS-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-DATASETS
           PERFORM SIGNAL-MULTIPLE-EODS
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-DATASETS.
           MOVE 'FILE001' TO DS-ID(1)
           MOVE 'QSAM' TO DS-TYPE(1)
           MOVE 'FILE002' TO DS-ID(2)
           MOVE 'VSAM' TO DS-TYPE(2)
           MOVE 'FILE003' TO DS-ID(3)
           MOVE 'TEMP' TO DS-TYPE(3).
       
       SIGNAL-MULTIPLE-EODS.
           PERFORM VARYING SIGNAL-COUNT FROM 1 BY 1
               UNTIL SIGNAL-COUNT > MAX-SIGNALS
               
               MOVE DS-ID(SIGNAL-COUNT) TO DATASET-NAME
               PERFORM SIGNAL-SINGLE-EODS
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'E' TO DS-STATUS(SIGNAL-COUNT)
                   DISPLAY 'Data set ' SIGNAL-COUNT ' EODS signaled successfully'
               ELSE
                   MOVE 'F' TO DS-STATUS(SIGNAL-COUNT)
                   DISPLAY 'Data set ' SIGNAL-COUNT ' EODS signal failed'
               END-IF
           END-PERFORM.
       
       SIGNAL-SINGLE-EODS.
           EXEC CICS ISSUE EODS
               DATASET(DATASET-NAME)
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with End of Data Set Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEEODS03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATASET-NAME PIC X(8) VALUE 'MYFILE01'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  RETRY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RETRIES PIC S9(2) COMP VALUE 3.
       01  EODS-SIGNAL-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM SIGNAL-EODS-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       SIGNAL-EODS-WITH-RETRY.
           PERFORM SIGNAL-EODS
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' EODS signal operation'
               PERFORM SIGNAL-EODS-WITH-RETRY
           END-IF.
       
       SIGNAL-EODS.
           EXEC CICS ISSUE EODS
               DATASET(DATASET-NAME)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO EODS-SIGNAL-SUCCESSFUL
                   DISPLAY 'EODS signal operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to signal EODS'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid EODS signal request'
               WHEN DFHRESP(DATASETERR)
                   DISPLAY 'Data set EODS signal error'
               WHEN DFHRESP(DATASETNOTFOUND)
                   DISPLAY 'Data set not found'
               WHEN DFHRESP(DATASETINUSE)
                   DISPLAY 'Data set is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected EODS signal error'
           END-EVALUATE.

Data Set Management

Data Set Completion

  • • EODS Signal - Signal end of data set
  • • Data Set Close - Close data set
  • • Data Set Validation - Validate data set state
  • • Data Set Monitoring - Monitor data set status

Data Set Lifecycle

  • • Data Set Creation - Create data set
  • • Data Set Processing - Process data set
  • • Data Set Completion - Complete data set
  • • Data Set Cleanup - Clean up data set

Data Set Monitoring

  • • Data Set Tracking - Track data set usage
  • • Data Set Auditing - Audit data set operations
  • • Data Set Reporting - Report data set status
  • • Data Set Analysis - Analyze data set patterns

Data Set Error Recovery

  • • Data Set Error Detection - Detect data set errors
  • • Data Set Error Recovery - Recover from data set errors
  • • Data Set Retry Mechanisms - Implement data set retry logic
  • • Data Set Fallback Procedures - Use data set fallback procedures

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - EODS signal operation successful
  • DFHRESP(NOTAUTH) - Not authorized to signal EODS
  • DFHRESP(INVREQ) - Invalid EODS signal request
  • DFHRESP(DATASETERR) - Data set EODS signal error
  • DFHRESP(DATASETNOTFOUND) - Data set not found
  • DFHRESP(DATASETINUSE) - Data set is in use

Performance Considerations

Data Set Efficiency

  • • Optimize data set operations - Use efficient data set handling
  • • Minimize data set overhead - Reduce data set processing overhead
  • • Use data set pooling - Implement data set pooling
  • • Monitor data set frequency - Track data set EODS signal patterns

System Impact

  • • Monitor system impact - Track how EODS signal affects the system
  • • Optimize data set handling - Ensure efficient data set processing
  • • Manage data set usage - Monitor data set consumption
  • • Track performance metrics - Monitor data set handling performance

Best Practices

End of Data Set Signaling Best Practices

  • • Signal EODS only when data set processing is complete
  • • Implement proper error handling for data set operations
  • • Validate data set state before signaling EODS
  • • Use appropriate data set management techniques
  • • Monitor data set EODS signaling activities and performance
  • • Maintain data set EODS signaling audit trails
  • • Handle data set EODS signaling errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS ISSUE EODS like finishing a book:

  • • Reading Book: "You are reading a book" - Processing data set
  • • Finished Reading: "You finished reading the book" - End of data set
  • • Close Book: "Close the book" - Signal EODS
  • • Put Away: "Put the book away" - Data set completion
  • • Done: "You are done with the book" - Data set finished

Exercises

Exercise 1: Basic End of Data Set Signaling

Create a program that signals end of a basic data set.

Exercise 2: Advanced Data Set Management

Write a program that manages multiple data set EODS signaling.

Exercise 3: Error Handling

Implement comprehensive error handling for data set EODS signaling failures.

Related Concepts

Data Set Management

Managing system data sets

Data Set Completion

Completing data sets

Data Set Processing

Processing data sets

Data Set Monitoring

Monitoring data sets

Error Handling

Managing data set errors