Structure of the Database Tblspace
The database tblspace appears only
in the initial chunk of the root dbspace. The database tblspace contains
one entry for each database managed by the database server. Figure 1 illustrates the location
of the database tblspace.
Figure 1. Database Tblspace Location in Initial Chunk of Root Dbspace 
Database Tblspace Number
The tblspace number of the database tblspace is always 0x100002. This tblspace number appears in an onstat -t listing if the database tblspace is active.