FYI ...

What's new in IBM Informix version 12.10.xC5 - http://www-01.ibm.com/support/knowledgecenter/SSGU8G_12.1.0/com.ibm.po.doc/new_features_ce.htm

Multitenancy in Informix

You can now deploy an Informix server that supports multiple tenants. A tenant is a set of users in a client organization that needs to access the same data and system resources. You create a dedicated tenant database, and assign storage and processing resources for that database based on the service-level agreements with the client organization. For example, you can provide services to multiple companies that run efficiently in a single Informix instance.

... and so on ...

Kind regards,
Vadim.