(Optional) The name of the WebSphere MQ queue manager that is associated with the User Name Server. If you want to remove topic security, specify an empty string (two double quotation marks, "").
(Optional) The maximum Java virtual machine (JVM) heap size, in megabytes. The smallest value that you can set is 64. If you do not set this parameter, the default size of 128 MB is used.
If you want to change other properties, you must delete and recreate the Configuration Manager. If you want to change the DataBaseUserID, see Modifying access to the broker database for instructions.