Managing access through trusted contexts
You can use trusted contexts to manage access to your Db2 subsystems, which helps you improve data security.
You can use trusted connections within a trusted context. When you do this, you can reuse the authorization and switch users of the connection without the database server needing to authenticate the IDs. To use trusted connections, you cannot set the ALL subsystem parameter to ALL and set the RESTART subsystem parameter to DEFER on installation panel DSNTIPS