Before reading about reusing used free pages and used free segments in this section, you must be familiar with page statuses and segment statuses. Table 15-4 lists and describes pages statuses, and Table 15-5 lists and describes segment statuses.

Table 15-4 Page statuses

Page status	Description
Used page	A page in which table or index data is stored. A used page that is completely filled with data such that no more can be added is called a full page, and a used page from which data has been deleted so that it no longer contains data is called a used free page.
Unused page	A page that is not being used.
Free page	A page in which no data is stored. Both used free pages and unused pages are called free pages.

Table 15-5 Segment statuses

Segment status	Description
Used segment*	A segment in which table or index data is stored. A used segment that is completely filled with data such that no more can be added is called a full segment, and a used segment from which data has been deleted so that only free pages remain (used free pages or unused pages) is called a used free segment.
Unused segment	A segment that is not being used. This segment can be used by any table or index in the RDAREA.
Free segment	A segment in which no data is stored. Both used free segments and unused segments are called free segments.

^* A used segment can be used only by a table or an index that stored data in it. Other tables or indexes cannot use such a segment.