AUTOMATIC RECOVERING SYSTEM FOR INDEX PROGRAMMING FILE

PROBLEM TO BE SOLVED: To keep consistency between a data file and an index file by erasing the contents of a non-volatile memory after the re-registration of the key of a record to be added to the index file is tried when the contents of the record to be added exist in the data file. SOLUTION: When adding the record according to a WRITE instruction, the number of the record to be added is stored in the SRAM of the non-volatile memory and the contents of the record to be added are registered in a data file 15. While the file is opened and the record is added, based on the contents of the non-volatile memory just after system start, it is confirmed whether the contents of the record to be added exist in the data file 15 or not and when those contents exist, after the re-registration of the key of the record to be added to respective index files 16 and 17 is tried, the contents of the non-volatile memory are erased. Therefore, consistency between files can be easily secured.