Modifying Physical Database Definitions › Changing the Access Method of a Disk Journal

Changing the Access Method of a Disk Journal

Steps

You can change the access method used for a disk journal file from non-VSAM to VSAM or vice versa. To do this you must:

1. Change the definition of the disk journal file specifying the desired access method. Alter the page size of the journal buffer:
   • If changing from non-VSAM to VSAM, the page size should be 8 bytes less than the control interval size
   • If changing from VSAM to non-VSAM, choose an optimal page size for the device type
2. Generate, punch, and link the DMCL.
3. Shut down the system.
4. Offload all currently used journals using the ARCHIVE JOURNAL utility statement with the ALL option and the old DMCL.
5. Allocate and format new disk journal files.
6. Restart the system with the new DMCL and the new journal files.