If an error occurs in a user server or scheduling of a user server needs to be terminated in order to replace execution form files, scheduling can be shut down with the scdhold command. When service_hold=Y is specified in the user service definition, the scheduling can be held in units of services. Scheduling for MHP and for the system service cannot be shut down with this command (the mcftdctsv command must be used to shut down MHP scheduling).

Once scheduling is shut down, any subsequently issued service request and any service request in the scheduling queue results in an error return.

Note that, if the schhold command with the -p option specified is executed, the service request in a scheduling queue is held until scheduling is restarted. In addition, any service request that may occur after the shutdown of scheduling is accepted.

Scheduling that was shut down with the scdhold command can be restarted with the scdrles command.

At restart, the shutdown status of scheduling can be inherited. To inherit the shutdown status, specify the following in the user service definition:

• receive_from=queue
• hold_recover=Y

Scheduling can also be shut down on the basis of a specification in the user service definition. The following lists the specifications and the conditions that result in scheduling shutdown:

• hold=Y specified:
  User server terminates abnormally once
  
• term_watch_time specified:
  User server terminates abnormally three times in a row within the specified time