The maximum number of logins to the server and users to the database has been increased. ASE 12.5 now supports:
2 billion plus 32K logins to the dataserver
2 billion less 1032193 users to a database
1032193 groups to a database
There is some new behavior due to this change:
Negative values may be used for user IDs (uid)
The server user ID (suid) associated with a group or a role in sysusers is no longer equal to the negation of their uid. In ASE 12, every suid associated with a group or a role in sysusers is set to -2(INVALID_SUID).
See What’s New in Adaptive Server Enterprise for ID ranges.