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. |