IMS commands

This document contains day-to-day IMS subsystem commands.

Through IMS console:

Specify @{ variable }

Description	Command
Start IMS MPR Region	/STA REG @{IMS_MPR}
Start IMS Program	/STA PGM @{IMS_PROGRAM}
Start IMS Transaction	/STA TRAN @{IMS_TRANSACTION}
Start IMS Database	/STA DB @{IMS_DATABASE}
Unlock IMS Program	/UNLOCK PGM @{IMS_PROGRAM}
Unlock IMS Transaction	/UNLOCK TRAN @{IMS_TRANSACTION}
Unlock IMS Database	/UNLOCK DB @{IMS_DATABASE}

Through JCL jobs:

Specify @{ variable }

Description	Link
Start IMS Address space	link
Start IMS MPR Region	link
Start IMS Program	link
Unlock IMS Transaction	link
Unlock and Start IMS Transaction	link
Unlock IMS Database	link
Unlock IMS Program	link

Start IMS 15.1

First you need to start IRLM:

/S IMS15RL1

And then IMS control region:

/S IMS15CR1

In SDSF you will see a list of parameters

After starting, the following message will appear (it will be white):

*xx DFS996I IMS READY

where xx - is an outstanding message number

In the case of a cold start, enter:

/xx,/NRE CHKPT 0 FORMAT ALL

But if you do a warm start:

/xx,/NRE

If IMS started successfully, you should see the message

DFS994I COLD START COMPLETED.
or
DFS994I WARM START COMPLETED.

NOTE: A sign of a normally working IMS - is a WTO message in the log: хх DFS996I IMS READY

To restart a badly stopped IMS, you need to type:

/xx,/ERE OVERRIDE

Log off from IMS

1. Type /SIGN OFF
2. Clear screen via CLEAR emulator option
3. To drop the VTAM terminal session to the IMS application, execute /RCL

To stop IMS

/xx,/CHE FREEZE 

Where xx - is the WTO message number. Or just make cancel IMSA41CR. Then, when restarting, you must issue: xx / ERE OVERRIDE

/STO REGION 3

Where 3 is the number of region.

Abend: U0456 - PSB locked because of prior program failure:

/dis PGM DSN8IC0 

/sto PGM DSN8IC0 

/dis PGM DSN8IC0 

/start PGM DSN8IC0