The database server created a temporary disk file but received an error while it attempted to write into the file. Check the accompanying ISAM error code, and look for operating-system messages that might give more information. On UNIX systems, the file should have been created in the directory specified by the DBTEMP environment variable (/tmp by default); on DOS systems, the file should be in the current directory. Possibly that disk is full, or a hardware error occurred. Since Version 5.01, the IBM Informix SE database server uses the DBTEMP environment variable, but IBM Informix Dynamic Server and IBM Informix OnLine Dynamic Server do not.