directories. Use this user ID when editing configuration files or performing other administrative tasks. Set up a user ID alias table. Using the alias table causes poorer performance and increases systems management costs and complexity. If you do not have a user ID alias table defined, you need to create one. This must be done first on your driving system and then on any system image using this product. This fits in with the IBM strategy to place all customized data in the /etc directory. This table is specified by the USERIDALIASTABLE keyword in the BPXPRMxx PARMLIB member. Because the user ID name alias table must be protected from update by nonprivileged users, only users with superuser authority should be given update access to it. All users should have read access to the file. Your userid alias table will need to contain your MVS chosen names and the associated required names. Your chosen MVS user ID and group names must be located in columns 1-8 and the associated aliases must be located on the same line in columns 10-17. Activate the userid alias table. If you are already using the userid alias table, new database queries will yield the new alias if the user ID performing the query has read/execute access to the userid/group name alias table. The table is checked every 15 minutes and refreshed if it has been changed. If a change needs to be activated sooner, you can use the SETOMVS or SET OMVS operator commands. If you are not using the userid alias table, you can use the SET OMVS operator command to activate it now. For example: SET OMVS USERIDALIASTABLE=/etc/tablename Where /etc/tablename is the name of your userid alias table. You can also use the SETOMVS operator command. See z/OS MVS System Commands, SA22-7627 for a