Orchestrator requires a database. It is recommended that the Orchestrator database is separate from the standard vCenter Server database. For small-scale deployments, you can use the SQL Server Express database that is bundled with vCenter Server.
Note
To ensure efficient CPU and memory usage, you should consider hosting the Orchestrator database and the Orchestrator server on different machines. Verify that at least 1GB of free disk space is available on each machine.
Orchestrator supports Oracle, SQL Server 2003, SQL Server 2008, SQL Server Express, PostgreSQL, as well as the vCenter Server datasource.