Data Access Service (DAS) is an object management service, which allows users to define objects using metadata. DAS manages the object and access to objects and automates transmission and persistence. DAS also serves as a facade for accessing data from any persistent data store such as databases, directory services or files. The operations of DAS include uniform data access through JDBC and optionally high-performance event insert strategies using native connectors (that is, OCI for Oracle 9i and ADO for Microsoft SQL Server).