In this blog post, you’ll learn more about the Sybase Error Only one dbspace file may be added at a time for multiplex servers and the reason for receiving this error
Sybase SQL Error Message
Only one dbspace file may be added at a time for multiplex servers
Reason for this Error
When using ALTER DBSPACE to add a file to a multiplex server, only one file may be added at a time. Specifying a list of files to add is not supported.