The database server needed to allocate data-space memory in order to process the query, but none was available. This error may reflect a hardware limit, an operating-system configuration limit, or a temporary shortage of space.
Try the query again after a delay. If it still fails, consult your system administrator. If possible, revise your query to join fewer tables, to order or group on fewer columns, or to operate in two or more separate statements. On DOS systems, exit to the operating-system command line, free some disk space or reduce the complexity of your program, and resubmit the program.
In versions later than 5.01, only this error message informs you that the database server is unable to allocate memory.