What is JCMON tool

The JCmon is a monitoring program, mainly used to

·         Display list of the processes

·         Enable, disable, restart and debugging the specific process

·         Shutdown a specific J2EE instance

1.   To start the JCmon, login with <SID>adm and execute the below command:

·         jcmon pf=/usr/sap/<SID>/sys/profile/<SAPSID><INSTANCE_ID><HOST>

2.   It will display the below 4 choices on the JControl Main Menu

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JControl Monitor Program - Main Menu
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0   :  exit
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10 : Cluster Administration Menu
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20 : Local Administration Menu
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30 : Shared Memory Menu (Solid Rock, experimental)
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command => 20

From Basis Administrative perspective, most important command is 20, which displays the status of the below:

1.   dispatcher

2.   Server0

3.   SDM

Idx	Name	PID	State	Error	Restart
0	dispatcher	8028	Running	0	yes
1	server0	7508	Running	0	yes
2	SDM	15804	Running	0	yes

JCMon Monitoring tool can be used to administrate the processes and JCmon main menu provides the following functions.

0: Exit

Returns back to the main menu

1: Refresh list

Refreshes the process list and the menu

2: Shutdown instance

Invokes the shutdown of the specified J2EE instance

3: Enable process

Enables and starts a process, which is switched off. (Restart == no)

4: Disable Process

Stops a running process and switches off the restart flag

5: Restart Process

Restarts the specified process

6: Enable bootstrapping on restart

7: Disable bootstrapping on restart

8: Enable Debugging

Checks if the specified process is running in debug mode. If not and the process is configured for debugging, JControl will restart the process in debug mode

9: Disable Debugging

If the process is running in debug mode, JControl will restart the process and switch off the debug mode

10: Dump stack trace

The specified process gets an event to invoke the dump of the stack trace of the Java VM. The stack trace is stored in the stderr<n> output file in the work directory

11: Process list

Displays the status and additional information about all the processes

12: Port list

Displays a list with detailed information about the ports used by the J2EE Engine

13: Activate debug session

Activates the debug session for the specified process. To activate a debug session:

·         The process must be running in debug mode.

·         The process must be “Load Balance Restricted”

14: Deactivate debug session

Deactivates the debug session. The process will be restarted or stopped – this depends on the process configuration

15: Increment trace level

This increments the trace level for the developer trace file of the specified process (dev_<component name>)

16: Decrement trace level

This decrements the trace level for the developer trace file of the specified process (dev_<component name>)

17: Enable process restart

18: Disable process restart

          - - - - - - - -- - - -- - - -Continue- - - -- - - -- - - -- - - -

40 : Enable bootstrapping for all processes with specified process type

41 : Enable bootstrapping for all processes excluding specified process type

          - - - - - - - -- - - -- - - -Continue- - - -- - - -- - - -- - - -

98: Synchronize instance properties

99: Extended process list on/off