2.2.1 DB2 database IBM DB2 is a relational database management system. It is used to store,  search, and retrieve content or documents within the Content Manager system.  A Content Manager system requires two databases, one for the Library Server  (default is LSDB) and one for the Resource Manager (default is RMDB), whether  Library Server and Resource Manager run on the same machine or on separate  machines. If the storage subsystem is OAM, it requires an additional database.  Content Manager can also be configured to use Oracle as a database; but this  configuration is not possible on z/OS. Also note is that the DB2 run-time client does not have the capability to connect  to a DB2 database that runs on z/OS. In this case, you have to configure a DB2  Connect™ as a gateway for the DB2 run-time client. Another option is to use  DB2 Connect Personal Edition to directly access a DB2 z/OS database. Both Resource Manager and Content Manager Toolkit for z/OS need connectivity  to the database from the z/OS UNIX System Services (USS) side. The primary purpose of Library Server is to service client requests for content. It  is used to define information or content that you want to store.  Library Server manages the access control to the content or documents stored in  Resource Manager. There can only be one Library Server in each Content Manager system  (instance). If you have more than one Library Server, then they do not connect in  any way and they run as individual systems. You may install more than one Library Server on a single z/OS system. This is  normally done when you want to use a test system. Library Server may be linked to more than one Resource Manager. A second  Resource Manager can be on another machine and even on another platform, for  example, AIX. The primary purpose of Resource Manager is to store and retrieve content  objects or documents. 2.2.2 Library Server 2.2.3 Resource Manager 16  DB2 Content Manager for z/OS: Implementation, Installation, and Migration