Structure of the Root Dbspace

The ROOTNAME, ROOTOFFSET, ROOTPATH, and ROOTSIZE configuration parameters specify the size and location of the initial chunk of the root dbspace. If the root dbspace is mirrored, the MIRROROFFSET and MIRRORPATH configuration parameters specify the mirror-chunk location. For more information about these parameters, see Configuration Parameters.

As part of disk-space initialization, the database server initializes the following structures in the initial chunk of the root dbspace:

• Twelve reserved pages
• The first chunk free-list page
• The tblspace tblspace
• The database tblspace
• The physical log
• The logical-log files
• oncheck -pe

  For more information, see Check the Chunk Free List with -ce and -pe.