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Disclosed is a method of minimizing needless fixing and unfixing of pages of records when sequentially scanning a database file.
English (United States)
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Efficient Page-Fixing Method using a Control Block
Disclosed is a method of minimizing needless fixing and unfixing of pages of
records when sequentially scanning a database file.
Records of a database are grouped into pages. A page is the unit of I/O for
the file. The disclosed method provides for an effficient means of scanning the
records in the file without the overhead of fixing the page in memory each time a
record is accessed. Instead, one page is fixed in memory until all the records on
it have been scanned.
When the database file scan is initialized, a cursor is established, marking the
record position within the file.
A control block, existing for the duration of a cursor, contains the following
information: a flag indicating whether the current page is fixed, and a flag
indicating whether the current record is at the beginning, middle or end of the
Pages are unfixed when a new page is read, not for each new record.
Specifically, a page is unfixed after reading the last physical record (when
scanning forward) or first physical record (scanning backward).