The database server created a temporary file in the directory that the DBTEMP environment variable (or /tmp by default on UNIX systems) specifies, but it encountered an error when it tried to write data into the file. To determine the cause of this error, check the accompanying ISAM error code and look for operating-system error messages that might give more invormation. Possible causes include: hardware failure, a full disk, or, if PDQ is enabled, insufficient shared memory.