manoopatil
New User
Joined: 07 Dec 2003
Posts: 56
Location: Montreal
|
|
|
|
Hi,
Following is the way a VSAM is getting defined. Please note the 'CYLINDERS' parameter. In the subsequent step this VSAM will be loaded with the data which requires about 6000 cylinders for data component and 17 cylinders for the index.
My question : Is it advisible to update the CYLINDERS parameter for the Data and Index component for the VSAM defined below to improve the performance of the subsequent step which is adding the data worth 6000 cylinders to this VSAM? Thanks for your time.
DEFINE CLUSTER(NAME(NBCV.TEST.UCM) -
DATACLAS(EXTEND) -
INDEXED -
UNIQUE -
CONTROLINTERVALSIZE(4096) -
RECSZ(40,40) -
KEYS(28 0)) -
DATA(NAME(NBCV.TEST.UCM.DATA) -
CYLINDERS(200 200) -
VOLUMES(*,*,*,*,*,*,*,*,*,*,*,*,*,*) -
CISZ(8192)) -
INDEX(NAME(NBCV.TEST.UCM.INDEX) -
VOLUMES(*,*,*,*,*,*,*,*,*,*,*,*,*,*) -
CISZ(512) -
CYL(3 2)) |
|
expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
|
|
|
|
The ability to allocate 6000 cylinders depends on the device geometry and may also be affected if you are using extended format VSAM data striping in your SMS routines.
If you use 3390-3 which has about 3330 usable cylinders, then code, 3000 and use additional volumes |
|
