This option is only specified when starting the arbiter server in a database mirroring system.
Omitting the authentication string means that there is no validation of the authentication string provided by a partner
If only one authentication string is specified, all databases must use that authentication string.
If more than one authentication string is provided in the list of authentication strings, then the list of database names
must contain the same number of entries. The authentication string is verified with the corresponding database in the DBN
The authentication string must match the SET MIRROR OPTION authentication_string value for all databases that use this server as an arbiter.
This parameter lists the databases that can use this server as an arbiter. To allow any database to use the server
as an arbiter, specify DBN=*.