Why should or shouldn’t I have more than one repository?
Multiple repositories is not recommended. Most companies that have multiple repositories end up regretting it, and it is very difficult, and labor intensive, to merge two repositories. Consider these disadvantages:
Resources (Universes and Documents) are difficult, if not impossible to share across repositories
It can be confusing for end users who have access to multiple repositories
The more repositories you have, the more maintenance you must do
If you are concerned about resource security, it is better to create multiple Universe and Document domains within a single repository.
If you are concerned about physical distance between users, such as in a global deployment, create a single Security domain (repository), and multiple Universe and Document domains, which can be located closer to the users. The login process may be a little slower, but all other actions, such as running queries, or exporting documents, will take no extra time.
MichaelWelter 
(BOB member since 2002-08-08)