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SQL Anywhere 12.0.1 » SQL Anywhere Server - Programming » Using SQL in applications » SQL Anywhere cursors

 

Cursor sensitivity

SQL Anywhere cursors are classified by their sensitivity to changes in the underlying data. In other words, cursor sensitivity is defined by the changes that are visible.

  • Insensitive cursors   The result set is fixed when the cursor is opened. No changes to the underlying data are visible.

  • Sensitive cursors   The result set can change after the cursor is opened. All changes to the underlying data are visible.

  • Asensitive cursors   Changes may be reflected in the membership, order, or values of the result set seen through the cursor, or may not be reflected at all. See Asensitive cursors.

  • Value-sensitive cursors   Changes to the order or values of the underlying data are visible. The membership of the result set is fixed when the cursor is opened. See Value-sensitive cursors.

The differing requirements on cursors place different constraints on execution and therefore affect performance.

 See also