Core Issue
When starting Cisco CallManager services, the Cisco Database Layer hung on starting up error message is displayed during a fresh installation of CiscoCallManager version 3.3(2) with new CDs and a new computer. Reinstallation of the entire server does not solve the problem.
Resolution
The database layer comprises a set of dynamic link libraries (DLL) that provide a common Access Point (AP) for applications that need to access the database to add, retrieve, and change data. It is a core service that most other services depend on since most services must add, retrieve, and edit data.
Among the items to check are the DLL versions, but that cannot be the case in this situation since the issue arises on a fresh installation.
The solution to this issue is to disable the Database Layer Service, reboot, then go back to Services - Activation / Deactivation and the installation proceeds properly. Most likely, there was a corruption or bad entry in the registry that caused some dependencies to start in the wrong order.
For more information, refer to these documents:
