The Orchestrator server requires a database. For small-scale deployments, you can use the SQL Server Express database that is bundled with vCenter Server or the preconfigured Orchestrator database. For better performance in a production environment, use a separate database for Orchestrator.
To ensure efficient CPU and memory usage, 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 11g, SQL Server 2005, SQL Server 2008, SQL Server 2012, SQL Server Express, and PostgreSQL. When you use the standard installation on Microsoft Windows, you can also set up Orchestrator to use the vCenter Server database.