Dynamic DMCL: You can use a DCMT command to load a new copy of the DMCL load module without recycling the DC/UCF system.
Article ID: 54000
Updated On:
Products
Issue/Introduction
By using the dynamic DMCL feature, you make a modified DMCL available under central version without having to bring down and restart the DC/UCF system.
Environment
Component: IDMS
Resolution
You can use a DCMT command to load a new copy of the DMCL load module without recycling the DC/UCF system.
You can dynamically:
- Add or remove a segment, area, or file.
- Add or remove a buffer pool.
- reassign files to buffers
- change file dataset name
- Expand an area by:
- Increasing the page range.
- Increasing the page size.
- Adding new files.
To safeguard the dynamic process, CA IDMS/DB quiesces affected areas, as appropriate, and updates the journal header with the timestamp of the new DMCL.
By using the dynamic DMCL feature, you make a modified DMCL available under central version without having to bring down and restart the DC/UCF system.
Example: In this example an EXPAND PAGE operation has been done for area ORG-DEMO-REGION, the file has been assigned to a different buffer and the file DSName has been changed. The AREA and FILE definitions are altered and the DMCL is then generated, punched and linked into the DBA loadlib.
When the command DCMT V DMCL NC is issued, IDMS loads the DMCL load module, determines what has changed, and displays those changes. It then prompts for a YES or NO response to proceed with the changes or cancel the new copy operation.
Here is what the DBA would see on the terminal after issuing DCMT V DMCL NC:
DMCL changes.... R160DMCL Compile Date/Time: 2009-04-20-08.09.22.9088
Overall changes....
** Area EMPDEMO.ORG-DEMO-REGION changed
** File EMPDEMO.ORGDEMO changed
Detail changes....
---------- Area ----------- Lock Lo-Page Hi-Page #Ret #Upd #Tret #Nt
EMPDEMO.ORG-DEMO-REGION Upd 75151 75175 0 0 0
Calc-Pg Pg-Size SMP-Intrvl -DDname-
75175 4276 2122 ORGDEMO
Changing to... 5064
-------- Data File -------- # Pages Pg-Size Fl-Type M-Cache S-Cache
EMPDEMO.ORGDEMO 25 4276 non-VSAM No No
Changing to... 5064
Buffer name: EMPWBUFFER changed to NEWBUFFER
DDname: ORGDEMO DSname (DMCL)..<yourHLQ>.EMPDEMO.ORGDEMO.P4276
DDname: ORGDEMO DSname (JCL)? Not Allocated
Change <yourHLQ>.EMPDEMO.ORGDEMO.P5064
Continue with VARY DMCL, Yes or No?
On the IDMS Log these messages were produced:
DC260100 V1600 USER:userid DCMT V DMCL NC
DC200084 V1600 T293 EMPDEMO.ORG-DEMO-REGION Area Varied Offline
DC200084 V1600 T293 EMPDEMO.ORG-DEMO-REGION Area Varied Close
DC205003 V1600 T293 Disk Journal is FULL. Submit ARCHIVE JOURNAL
DC200084 V1600 T293 EMPDEMO.ORG-DEMO-REGION Area Varied Update
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