Upgrading partitioned database environments

Upgrading partitioned database environments requires that you install Db2® version 12.1 as a new copy in all database partition servers, upgrade the instances and then upgrade the databases.

To upgrade Db2 servers in a partitioned database environment:

1. Perform a full offline backup for all database partitions.
   Use the BACKUP DATABASE command with the ON ALL DBPARTITIONNUMS parameter to back up all partitions. Verify that your databases are ready for upgrade, and perform any other pre-upgrade tasks that apply. Refer to Pre-upgrade tasks for Db2 servers.

   Note: Although database upgrade is a recoverable operation, for partitioned database environments recovery through migration is not supported. So ensure a full offline backup for all database partitions exists before proceeding.
2. Log on as root on Linux and UNIX operating systems or as a user with Local Administrator authority on Windows operating systems.
3. Install Db2 version 12.1 on each participant database partition server and set up your partitioned database environment.
   Select the Install New option in the Install a Product panel. Do not select the Work with Existing option.
4. Upgrade each instance on the database partition server that owns the instance.
   The first entry in the db2nodes.cfg file of the instance is the database partition server instance owner.
5. Upgrade each database by running the UPGRADE DATABASE command on the catalog partition.
   The catalog partition must be available when you issue the UPGRADE DATABASE regardless on what database partition you issue this command from.

   If any database partitions are not available, these database partitions are not upgraded. Also, if the UPGRADE DATABASE command is stopped, the remaining database partitions are not upgraded. However, you can run the UPGRADE DATABASE command again to process these particular database partitions afterward when they are available.