Changing the maximum OSAM data set size for a HALDB from 4 GB to 8 GB

Use the CHANGE.DB command to increase the maximum size of OSAM PHDAM and PHIDAM data sets for a HALDB database from 4 to 8 GB.

To increase the maximum size of HALDB OSAM data sets to 8 GB:

Procedure

  1. If the database is open in an online IMS system, stop access to the database by issuing either the /DBRECOVERY DB haldb_master command or the UPDATE DB NAME(haldb_master) STOP(ACCESS) command.
  2. If HALDB online reorganization has been run against the database, ensure that all of the database partitions use A through J data sets.
  3. Issue the CHANGE.DB command with the OSAM8G keyword. If the database has been reorganized online, you must also specify the OLRNOCAP keyword.
  4. Make the partitions available by issuing either the /START DB haldb_master command or the UPDATE DB NAME (partition_name) START(ACCESS) OPTION(OPEN) command.
The master database record in the RECON data set is updated to indicate that the HALDB supports 8-GB OSAM data sets.