Backing up existing database information
Before beginning the conversion process, back up the critical database elements.
Because you will be modifying the DBD statements for your existing database, deleting the database information from the RECON data sets, and unloading and reloading the database itself, you should back up each of these elements in case you need to restore the non-HALDB database structure.
To begin the conversion process, complete the following steps to back up the critical database elements:
- Create image copies of your database data sets by using one of the IMS image copy utilities or other means.
- Before making any changes to the DBD, back up the DBD source for the existing database.
- Before deleting information from the RECON data sets, back up
the RECON data sets. There are two methods to backing up the RECON
data sets:
- To save only the information specific to the database you are converting to HALDB, issue the DBRC LIST.DB command. If you need to revert your database to its non-HALDB state after the conversion, you will only have to re-enter into the RECON data sets the non-HALDB database information; however, you will likely have to manually re-enter the information into the RECON data sets.
- To back up the entire RECON data set, issue the DBRC BACKUP.RECON command. If you need to revert your database to its non-HALDB state after the conversion, you will have to restore the backup copy of the RECON data set and then recover all changes to the RECON data sets that have occurred since the backup copy was created.