IBM 000-8697 Database Tblspace

System Architecture 2-107
Database Tblspace
tblspace Tblspace Bit-Map Page
Thefirst page of the tblspace tblspace, like the first page of any initial extent,
isa bit map that describes the page fullness of the following pages. Each page
thatfollows has an entry on the bit-map page. If needed, additional bit-map
pagesare located throughout the contiguous space allocated for the tblspace,
arrangedso that each bit map describes only the pages that follow it, until the
next bit map or the end of the dbspace. The bit-map pages are chained in a
linked list.
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
OnLine.Figure 2-20 illustrates the location of the database tblspace.
The tblspace number of the database tblspace is always 0x1000002. This
tblspacenumber appears in a tbstat -t listing if the database tblspace is active.
Refer topage 2-104 for more details about the tblspace number.
Figure2-20
The database
tblspace appears
only in the root
dbspace,
following the
tblspace tblspace.
Reserved pages
Tblspace tblspace
Database tblspace
Chunk-free-list page
Tblspace tblspace
(continued)
Root dbspace initial chunk
free pages