A type of locking in which each page touched by the current rowset (as determined by the RowsetSize property) is locked as soon as the cursor is opened and not freed until the rowset is repositioned ? when the next set of pages touched by the current rowset is locked. Pessimistic locking is enabled when the rdConcurLock LockType option is used when opening an rdoResultset. This type of locking is used only in special circumstances.