OPERATIONS

Message Handling

Message is a means of communication between system and user. These are system messages & User Message. 

In User Messages users can send their own messages. 
System Messages and Users Messages are put in the user’s message queue. Messages may be 
a) Informational (No reply Needed)
b) Inquiry (Reply Needed)

Even users can send messages to each other using following commands,
1.  SNDBRKMSG (Break messages is used to interrupt the user’s work)
2.  SNDMSG (F4) 
         TOUSR(< user profile >)  or
         TOMSGQ(< Workstation name >)

By default every message given to the administrator goes into QSYSOPR message queue. Administrator can change this default message queue.

To see the messages of any message queue use following command,
DSPMSG       

To check system operators message queue use,
DSPMSG  QSYSOPR

System Operations

An administrator continuously requires to Monitor following on the system.

1.  % ASP USAGE OF THE SYSTEM:
To find out the Percentage ASP utilized use following command:
WRKSYSSTS

2. CHECKING ACTIVE JOBS:
Use following command to check active jobs as well as CPU utilization,
WRKACTJOB

3. CHECKING SUBSYSTEM STATUS:
Use the following command to check all the active subsystems,
WRKSBS

4. TO CHECK THE LOG:
Use following command to find out the log on the system.
DSPLOG
You can use same command to find log of a fixed time span.

5. TO CHECK STATUS OF *LIN,*DEV,*CTL :
Use following commands to find status of Lines, Devices and Controllers respectively,
WRKCFGSTS  *LIN
WRKCFGSTS  *DEV
WRKCFGSTS  *CTL

6. CHECKING DISK STATUS :
Use following command to check the disk status,
WRKDSKSTS

7. WRKJOBQ – Display all job queues status and list of jobs in the queue.

8. WRKDEVD – Display and manage device description


9. WRKJOBSCDE – Display all  job schedule entries for the system

Job Management

On AS/400 Job is a Unit of Work Done. When a job is started, system creates a set of resources for the job. These resources are destroyed automatically by the system, when the job ends. The AS/400 assigns a unique identifier to each AS/400 job. The job identifier consists of three parts :  a system assigned job number ; the user profile of the user associated with the job and a general job name. Thus a Job is identified by a Job name, a User and a Job Number (6 digits). Valid job names are
    024671/Nishar/DSP01
    345678/Ahamed/MONTHEND

There are 2 types of user jobs

        1. Interactive
        2. Batch 
       
Interactive jobs require constant interaction between the user and the computer. Interactive jobs usually involve typing information into a display screen and waiting for the computer to respond.

Batch job runs in the background without interaction with user. Ends when all programs that are part of batch jobs are terminated. Have lower priority when compared to Interactive Jobs.

There are 3 types of system jobs
        1.Prestart
        2.Autostart
        3.Communication
       
User can do the following activities with the job.
        1.END
        2.HOLD
        3.RELEASE
        4.CHANGE
        
Every job is having priority to run on the system.1 is highest priority and 9 is lowest priority. 5 is the default priority. Administrator can change the priority.


1.  Use following command to track a particular user’s jobs,
        WRKUSRJOB

2. Use following command to find out jobs in JOBQ,
        WRKJOBQ 

3. Use following command to find scheduled jobs
        WRKJOBSCDE

4. To submit a job in batch use following command.
        SBMJOB

5. To find total number of active jobs on the system use the command as,
        WRKACTJOB

6. To find jobs running in particular subsystem use,
        WRKSBSJOB