A secondary database can take over the role of primary database at any time; for example, for scheduled maintenance where you want to move processing to a new location. An SDS takeover is a process that enables a specified secondary database to assume the role of the primary database.
When a secondary database is shut down with incomplete transactions and its primary is no longer available, error 1284 (User sign-on is currently disabled) is raised. If this occurs, sign on to the SDS Administration application in single user mode and then perform a hostile takeover.
For details, see the following subsections.