Initial Database

When an AutoCAD ^® session begins, the database contains the following elements:

• A set of nine symbol tables.

  Block table (AcDbBlockTable)

  Dimension style table (AcDbDimStyleTable)

  Layer table (AcDbLayerTable)

  Linetype table (AcDbLinetypeTable)

  Registered applications table (AcDbRegAppTable)

  Text style table (AcDbTextStyleTable)

  User Coordinate System table (AcDbUCSTable)

  Viewport table (AcDbViewportTable)

  View table (AcDbViewTable)

  Some of the symbol tables already contain one or more records. The layer table in a pristine database contains one record, layer 0. The block table initially contains three records: *MODEL_SPACE, *PAPER_SPACE, and *PAPER_SPACE0. The linetype table always has CONTINUOUS, BY_LAYER, and BY_BLOCK linetype table records. The registered applications table always has an ACAD table record. The text style table always has a STANDARD table record.

• A named object dictionary. When a database is created, this dictionary already contains the two database dictionaries: the GROUP dictionary and the MLINE style dictionary. Within the MLINE style dictionary, the STANDARD style is always present.
• A fixed set of header variables. (These are not database objects.)