Table ID 

The database user specifies a table by entering its name. The table is accessed internally using a table ID of a fixed length. The relationship between the table name and this table ID is stored in the database dictionary. In addition to this, SAP DB maintains a file directory in which the root pages of B* trees are assigned to Table IDs.

The Table IDs are stored in the file directory together with a type flag and other information. The type flag specifies whether the table contains primary data, secondary key , or LONG data. The type flag specification enables one Table ID to be used for all the B* trees required for the logical structures of one table.