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Datamodel – Physical
The physical data model describes the way data is stored in an individual database. The connection between the logical and the physical data model is established by converting the logical data objects into database definition instructions in accordance with a particular Data Definition Language (DDL). After execution of the DDL on a physical database, the definitions of the database objects are stored in the data dictionary of that database. The data dictionary itself often forms part of the database, which is queried by the database administrator (DBA) as the most important metadata repository of that database through SQL.