Being a database administrator and developer, one often needs to restore databases from one database server to another. In DB2, when a database is created, by default, the DB2 instance owner becomes the owner of the database. So when you restore a database backup across different database servers where both, the source and the target database servers have the same instance owner names, it works fine. But when the source and target database servers have different instance owners, the database gets restored successfully, but there can be privilege/authorization issues when you try to access the database objects. The most common being, SQL0551N and SQL1092N.
This problem can be solved by creating the source database server’s instance owner on target database server, connecting to the database through it and then granting the DBADM privileges to the new instance owner. But there is a more elegant and simpler way to do this using the DB2_RESTORE_GRANT_ADMIN_AUTHORITIES DB2 registry variable.