## File Directory

The file directory is an internal administration structure of the database system. The file directory contains the following, among other things:

● The assignment of the root pages of the B* trees to the table IDs

● The assignment of the initial pages of page chains to the table IDs

● Type flags (specify whether a table contains primary data, secondary keys or LONG values)

● Statistical information on the number of data records and the size of the tables

Each internal file in the file directory has a unique file number (8 bytes long).

For more information on the file directory, see, among others, system tables FILES and FILEDIRECTORIES.

See also:

Concepts of the Database System, Logical Access Structures

Reference Manual, System Tables