Before describing the pdreclaim command, this section describes pages and segments. Pages and segments can be in the statuses shown in Table 11-1.
Table 11-1 Page and segment status
Page and segment status | Description |
---|---|
Used page | A page containing table or index data. A page that is filled with data and in which no more data can be stored is called a full page; a page that contains no data due to data deletion is called a used free page. |
Unused page | A page that has never been used. |
Free page | A page that contains no data. Used free pages and unused pages are both free pages. |
Used segment* | A segment containing table or index data. A segment that is filled with data and to which no more data can be added is called a full segment; a segment whose pages are all empty due to data deletion (used free pages or unused pages) is called a used free segment. |
Unused segment | A segment that has never been used. All tables (or indexes) in RDAREAs can use unused segments. |
Free segment | A segment that contains no data. Used free segments and unused segments are both free segments. |