Ingres 9.2 Migration Guide - Actian

Appendix C: Features Introduced inIngres 9.2This section contains the following topics:DBMS Server Enhancements (see page 143)Supportability Enhancements (see page 151)Connectivity Enhancements (see page 152)DBMS Server EnhancementsScrollable CursorsAn ANSI/ISO SQL-92 feature, scrollable cursors are database query result setsthat are maintained in the database server as long as the cursor is open andthat allow the user to retrieve rows of a result set in any sequence. Thenumber of elements of the result set is easily determined by the applicationthat is using the cursor.Scrollable cursors greatly ease the display of information, for example, inscrolling web applications.Scrollable cursors allow an application to move backward and forward throughthe query results faster. Because scrollable cursors require more overheadthan non-scrollable cursors, you should deploy scrollable cursors only whereyour application requires it.The scrollable cursor can be declared as either a static or keyset type.Static scrollable cursors are read only. The complete result set is stored in aninternal temporary table.Keyset scrollable cursors are updatable. Only the key columns and tids of theresult set are stored in an internal temporary tableScrollable cursors are supported in Ingres OpenAPI and JDBC.For more information, see the OpenAPI User Guide, and the ConnectivityGuide.Features Introduced in Ingres 9.2 143