Progress0 of 0 lessons

CICS ENTER TRACENUM - Trace Number Entry

CICS ENTER TRACENUM provides trace number entry capabilities in CICS environments. It enables programs to enter trace numbers, manage trace operations, and handle trace number entry for debugging and monitoring purposes.

Command Syntax

cobol
1
2
3
4
5
       EXEC CICS ENTER TRACENUM
            [TRACENUM(trace-number)]
            [RESP(response-code)]
            [RESP2(response-code-2)]
       END-EXEC.

Parameters

TRACENUM(trace-number)

Specifies the trace number to be entered into the trace table. This parameter identifies the specific trace entry for tracking and analysis.

RESP(response-code)

Specifies the response code variable to receive the operation result. This parameter provides error handling and status information.

RESP2(response-code-2)

Specifies the secondary response code variable for additional error information. This parameter provides extended error details when available.

Trace Types

Execution Trace

ENTER TRACENUM records execution trace numbers, providing a chronological record of program execution flow and control points.

Debug Trace

The command supports debug trace entries, enabling detailed tracking of program logic and decision points for troubleshooting.

Performance Trace

Performance trace numbers track execution timing and resource usage for performance analysis and optimization.

Error Trace

Error trace entries record error conditions and exception handling for error analysis and system monitoring.

Programming Examples

Basic Trace Number Entry

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
       WORKING-STORAGE SECTION.
       01  TRACE-NUMBER       PIC S9(8) COMP VALUE 1001.
       01  RESPONSE-CODE      PIC S9(8) COMP.
       01  RESPONSE-CODE-2    PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS ENTER TRACENUM
                TRACENUM(TRACE-NUMBER)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Trace number entered successfully'
           ELSE
               DISPLAY 'Error entering trace number: ' RESPONSE-CODE
           END-IF.

Multiple Trace Entries

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
       WORKING-STORAGE SECTION.
       01  TRACE-NUMBER       PIC S9(8) COMP.
       01  RESPONSE-CODE      PIC S9(8) COMP.
       01  RESPONSE-CODE-2    PIC S9(8) COMP.
       01  TRACE-COUNT        PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM ENTER-START-TRACE
           PERFORM PROCESS-DATA
           PERFORM ENTER-END-TRACE.
           
       ENTER-START-TRACE.
           MOVE 2001 TO TRACE-NUMBER
           EXEC CICS ENTER TRACENUM
                TRACENUM(TRACE-NUMBER)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO TRACE-COUNT
               DISPLAY 'Start trace entered'
           END-IF.
           
       PROCESS-DATA.
           MOVE 2002 TO TRACE-NUMBER
           EXEC CICS ENTER TRACENUM
                TRACENUM(TRACE-NUMBER)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO TRACE-COUNT
               DISPLAY 'Processing trace entered'
           END-IF.
           
       ENTER-END-TRACE.
           MOVE 2003 TO TRACE-NUMBER
           EXEC CICS ENTER TRACENUM
                TRACENUM(TRACE-NUMBER)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO TRACE-COUNT
               DISPLAY 'End trace entered'
           END-IF.

Dynamic Trace Entry

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
       WORKING-STORAGE SECTION.
       01  TRACE-NUMBER       PIC S9(8) COMP.
       01  RESPONSE-CODE      PIC S9(8) COMP.
       01  RESPONSE-CODE-2    PIC S9(8) COMP.
       01  PROCESSING-COUNT   PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM VARYING PROCESSING-COUNT FROM 1 BY 1
           UNTIL PROCESSING-COUNT > 5
               PERFORM CALCULATE-TRACE-NUMBER
               PERFORM ENTER-TRACE-ENTRY
           END-PERFORM.
           
       CALCULATE-TRACE-NUMBER.
           COMPUTE TRACE-NUMBER = 3000 + PROCESSING-COUNT.
           
       ENTER-TRACE-ENTRY.
           EXEC CICS ENTER TRACENUM
                TRACENUM(TRACE-NUMBER)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Trace ' TRACE-NUMBER ' entered successfully'
           ELSE
               DISPLAY 'Error entering trace ' TRACE-NUMBER ': ' RESPONSE-CODE
           END-IF.

Error Handling

Response Code 0

Successful trace entry. The trace number has been successfully entered into the trace table.

Response Code 8

Invalid trace number. The specified trace number is invalid or not supported.

Response Code 12

Trace table full. The trace table has reached its maximum capacity and cannot accept new entries.

Response Code 16

Trace not active. Trace functionality is not active or not available for the current transaction.

Response Code 20

Trace entry failed. The trace entry operation failed due to system conditions or resource limitations.

Performance Considerations

Trace Overhead

ENTER TRACENUM has minimal performance overhead, but excessive trace entries can impact system performance.

Trace Table Management

Proper trace table management ensures efficient trace operations and prevents trace table overflow conditions.

Trace Frequency

Trace entry frequency should be balanced to provide adequate debugging information without excessive system impact.

Best Practices

Error Handling

Always check response codes and handle errors appropriately, especially for trace table capacity and trace availability issues.

Trace Numbering

Use meaningful trace numbers that clearly identify the purpose and context of each trace entry for effective debugging.

Trace Management

Implement proper trace management strategies to ensure effective debugging while minimizing system impact.

Performance Optimization

Use trace entries strategically and implement conditional trace logic to optimize performance in production environments.

Explain It Like I's 5 Years Old

Imagine you're playing a game and you want to remember all the important steps you took. CICS ENTER TRACENUM is like writing down a number in a special notebook every time you do something important in your game.

The trace number is like the page number in your notebook, so you can find that step later. Each time you do something important, you write down a new number to remember what happened.

Just like you don't want to fill up your notebook too quickly, the program doesn't want to fill up the trace table too fast, so it only writes down the really important steps.

Exercises

Exercise 1: Basic Trace Entry

Write a program that uses ENTER TRACENUM to enter trace numbers at different points in program execution.

Exercise 2: Conditional Trace Entry

Create a program that enters trace numbers only when specific conditions are met, implementing conditional trace logic.

Exercise 3: Trace Management

Implement a trace management system that tracks trace entry success and handles trace table capacity issues.

Related Concepts

CICS Tracing

Understanding CICS tracing capabilities and operations

CICS Debugging

Learning about CICS debugging techniques and tools

CICS Performance Monitoring

Understanding CICS performance monitoring and analysis

CICS Error Handling

Learning about CICS error handling and response codes