Prasad

• May 14th, 2012

 

You cannot change the key in a VSAM file. Key is defined while defining the file, so the starting position and length remain the same and there is no alter command to change the key.

Robert

• May 9th, 2013

 

You have to delete and redefine the vsam file using the new key definition with IDCAMS

suvendra mishra

• Jun 26th, 2015

 

you can use ALTER command
//sysin DD *
ALTER (vsam dataset) -
addressspace(n) -
cisz(4096) -
key(6,0)

velu

• Sep 12th, 2015

 

VSAM files Key definition can be changed. But, you have to delete the vsam file and define it with again with same name (index) and the new values in KEY option.