What should the tt_db databases contain?

The tt_db databases currently contain the following ten files:

• access_table.ind
• access_table.rec
• file_object_map.ind
• file_object_map.rec
• file_table.ind
• file_table.rec
• file_table.var
• property_table.ind
• property_table.rec
• property_table.var

The permissions for these files are set to -rw-r--r-- .