In AutoCAD Civil 3D, survey data is not drawing dependent and is stored in an external database. For display and visualization, survey data can be manually and automatically inserted into a drawing when the survey database is updated or when data is imported into the survey database.
The Survey database consists of two files, the.sdbx file is the main survey database and it contains all the data in the survey database collections except for the Extended Properties definitions and values. The Survey .sdxx file contains the Extended Properties definitions and values.
Survey databases from versions prior to AutoCAD Civil 3D 2015 will be converted to Microsoft® SQL Server® Compact 3.5. New and converted survey database files have the file extensions SDBX and SDXX.
To support a 64-bit operating system in AutoCAD Civil 3D 2011, survey database files, equipment database files, and figure prefix database files must be migrated to a new format. On the Survey tab in Toolspace, a database item that requires migration will display the "out-of-date" icon to provide a visual cue that it requires migration. To complete the migration, right-click the item and select the migration command.
