• During creation of virtual database, the adapter name used is "COMPOSITE_DATABASE".

• The DATASOURCE_TYPE of a virtual database is "VirtualRelational".

• Use the "CREATE VIRTUAL DATABASE IF NOT EXISTS" syntax to avoid any duplicate error messages.

• For annotation QUOTED_STRING, an explicit NULL keyword or a quoted string 'NULL' can be specified. This is to allow annotation to be unset or set to null explicitly.

• The virtual databases are created in the "/services/databases" area.

• Altering a virtual database can alter the annotation or rename the virtual database. Use the "RENAME AS" syntax to rename a published database.

• IF EXISTS" syntax in DROP to avoid any error messages, in case the resource is not found.