Break points

Question

hai gurus...
how many watch points and break point can be used in each program...
types of watch points and break points....
Thanks
Pavan

Answer 1

Hi
a watchpoint is an indicator in a program that tells the ABAP runtime processor to interrupt the program at a particular point. Unlike breakpoints, however, watchpoints are not activated until the contents of a specified field change. Watchpoints, like dynamic breakpoints, are user-specific, and so do not affect other users running the same program. You can only define watchpoints in the Debugger.
Use
You set watchpoints in the Debugger to monitor the contents of specific fields. They inform you when the value of a field changes. When the value changes, the Debugger interrupts the program.
Features
· You can set up to five watchpoints in a program.
See also Setting Watchpoints.
· You can also specify the conditions under which a watchpoint is to become active.
· You can specify a logical link for up to five (conditional) watchpoints.
See also Specifying Logical Links.
· You can define watchpoints as either local or global. If you define a global watchpoint, it is active in all called programs. Local watchpoints are only active in
the specified program.
· You can change and delete watchpoints.
See Changing Watchpoints
· You can use watchpoints to display changes to the references of strings, data and object references, and internal tables.
See Memory Monitoring with Watchpoints
Breakpoints
Apart from being able to execute an ABAP program in the Debugger, you can also start the Debugger call by the choosing a breakpoint. This is achieved by setting one or more of these breakpoints in the program. A breakpoint is a signal at a particular point in the program that tells the ABAP runtime processor to interrupt processing and start the Debugger. The Debugger is activated when the program reaches this point.
There is also a special kind of breakpoint called a watchpoint. When you use watchpoints, the Debugger is not activated until the contents of a particular field change. For more information, refer to the chapter Watchpoints.
Breakpoint Variants
The Debugger contains different breakpoint variants:
Static
A user-specific breakpoint is inserted in the source code as an ABAP statement using the keyword BREAK-POINT. A non user-specific breakpoint is set in the ABAP Editor using the BREAK user name statement.
Directly set
dynamic breakpoints
Can be set in the ABAP Editor or the Debugger by double-clicking a line, for example. Dynamic breakpoints are always user-specific, and are deleted when you log off from the R/3 System.
Breakpoints
at statements
The Debugger stops the program immediately before the specified statement is executed.
Breakpoints
at subroutines
The Debugger stops the program immediately before the specified subroutine is called.
Breakpoints at function modules
The Debugger stops the program immediately before the specified function module is called.
Breakpoints at methods
The Debugger stops the program immediately before the specified method is called.
Breakpoints at exceptions and system exceptions
The Debugger stops the program immediately after a system exception, that is, after a runtime error has been intercepted.
Static Breakpoints
Static breakpoints are always user-independent if there is no specification of a user name. Once a user has inserted the statement BREAK-POINT or BREAK name in an ABAP program, the system always interrupts the program at that point for that user or only for the user name. This procedure is only useful in the development phase of an application when program execution is always to be interrupted at the same place. For more information, refer to the chapter Static Breakpoints.
In HTTP sessions, a static breakpoint is skipped if you did not set additional dynamic HTTP breakpoints in the editor of a BSP page. Instead, a corresponding system log entry is written, which can be checked using transaction SM21.
Dynamic Breakpoints
Dynamic breakpoints are user-specific. Therefore, you should use them if you only want the program to be interrupted when you run it yourself, not when it is being executed by other users. All dynamic breakpoints are deleted when you log off from the R/3 System.
Dynamic breakpoints are more flexible than static breakpoints because you can deactivate or delete them at runtime. They have the following advantages:
· You do not have to change the program code.
· You can set them even when the program is locked by another programmer.
· You can define a counter that only activates the breakpoint after it has been reached.
Special dynamic breakpoints are useful when you want to interrupt a program directly before a particular ABAP statement, a subroutine, or an event, but do not know exactly where to find it in the source code. Event here is used to refer to the occurrence of a particular statement, for example, or calling up a method. Special dynamic breakpoints are user-specific. You can only set them in the Debugger. For more information, refer to the chapter Dynamic Breakpoints.
In HTTP sessions, the system stops both at static and dynamic breakpoints if a dynamic breakpoint was set in the editor of a BSP page before program execution.
Lifetime and Transfer of Breakpoints
A static breakpoint remains intact as long as the BREAK-POINT or BREAK-POINT name statement is not removed from the source code. Without saving, dynamic breakpoints only remain intact in the relevant internal session. However, they remain in effect during the entire user session if they are saved by choosing the menu path Breakpoints ® Save in the ABAP Debugger. For more details on the subject of user sessions and modes, refer to Modularization Techniques in the ABAP keyword documentation.
If you call an HTTP session during a user session, only the HTTP breakpoints are loaded when the HTTP session is started. You activate HTTP debugging in the ABAP Editor by choosing Utilities ® Settings ® HTTP Debugging. Depending on the setting, the system then displays either the HTTP or standard breakpoints in the Editor.
If you call an update session during a user session, breakpoints that were defined beforehand in the calling processing unit are copied to the new update session, where they can be displayed under Breakpoints. If, in the ABAP Debugger, you check Update Debugging under Settings and then, for example, call the update module func using CALL FUNCTION func IN UPDATE TASK, a new window is opened in which you can debug this function module in the update session. All the breakpoints that were set in the calling processing unit can also be processed here.
we can keep them at :
Statements
Subroutines
Function Module Calls
at Methods
System Exceptions
break point :
we can start debugging from that point or if we keep break point at some place we can directly got ot htat point using f6.
watch point: for example if we have to check the output for 4000 records based on a field value i.e.for vendor number 'in'we have to check then we will create watchpoint on field LIFNR value '2000'. then we can directly go to vendor whose numbe ris 2000
Regards,
Sree