PowerDesigner definition of CDM, LDM, PDM

Conceptual Data Model

The conceptual Data Model (CDM) helps you analyze the conceptual structure of an information system and then identifies the major entities that need to be described, the attributes in those entities, and the relationships between those entities. Conceptual data models are more abstract than logical or physical data models.

Logical Data Model

The logical Data Model (LDM) helps you analyze the structure of the information system, independent of any specific physical database implementation. LDM already involves entity identifiers, which are not as abstract as CDM, but do not allow you to design elements of views, indexes, and other more specific physical data models.

Physical Data Model

The physical Data Model (PDM) helps you analyze tables, views, and other database objects, including the multidimensional objects required by the Data warehouse. PDM is more specific than CDM and LDM. You can model, reverse engineer, and Kazuo into all the most popular databases.

Original

See the Getting Started with Data Modeling chapter in the Official document "Powerdesigner.chm".
Conceptual Data Models
A Conceptual Data Model (CDM) helps you analyze the conceptual structure of an information system, to identify the Princip Al entities to be represented, their attributes, and the relationships between them. A CDM is more abstract than a logical (LDM) or physical (PDM) data model.

Logical Data Models
Logical data Models A Logical data Model (LDM) helps you analyze the structure of a information system, independent of an Y specific physical database implementation. An LDM have migrated entity identifiers and is less abstract than a conceptual data model (CDM), but does Model views, indexes and other elements that is available in the more concrete physical data Model (PDM).

Physical Data Models
A physical data Model (PDM) helps analyze the tables, views, and other objects in a database, including Multidimens ional objects necessary for data warehousing. A PDM is more concrete than a conceptual (CDM) or logical (LDM) data model. You can model, Reverse-engineer, and generate for all the popular DBMSs.

Ouyida3 's CSDN Blog
2015.5.12

PowerDesigner definition of CDM, LDM, PDM