You call al list of the user names of all Database Manager Operators (DBM operators) registered for the current database instance.
You have the server authorization UserMgm.
user_getall
Log on to the Database Manager CLI as the operator DBM with the password DBM, create a connection to the database instance myDB, display all DBM operators for the database instance
dbmcli -u dbm,dbm -d myDB user_getall
OK
dbm
DBA
domain
OK<NL>
<userid><NL>
<userid><NL>
...
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