set generateuniqueid= { on | off}

This option determines whether generated IDs have an additional string appended to them that makes it very likely that the ID will be unique across a set of documents. The additional string is generated by the generate_id function and consists of a hyphen followed by eight hexadecimal characters representing the current date and time. Set this option to on to append the additional string to generated IDs and to off to not append the additional string. The default is on. This option has global scope.