Database Management
Reference Manual
Introduction to Database Concepts
:
Primary Database Hierarchy
: User Defined Hierarchies
User Defined Hierarchies
The database schemas in AVEVA E3D™ are fixed by AVEVA.
You may, however, customise the allowed hierarchy using UDETS. (User Defined Element Types).
A UDET must be based on an existing system type. For example, you may define a UDET :PUMP which is based on an EQUIPMENT. By default, a UDET will have the same allowed members and allowed owners as a base type. This can be customised to be a subset of that allowed on the base type, e.g. you might decide that SUBE are not allowed under a :PUMP even though they are allowed under an EQUI.
UDETs based on zones may own other UDETs based on zones. This allows very flexible data models to be built.
1974 to current year.
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