The work file management mode null in the data based

摘要

PURPOSE:To avoid waste of a disk medium by generating a temporary work file in a temporary work file generating storage means and dynamically extending the capacity of the file at the time of detecting a lack of the file capacity during the use of said work file. CONSTITUTION:A file opening means 109 discriminates whether a file whose opening is requested is a temporary file or nor; and when it is a temporary file, a work file is generated in a temporary work file generating storage means 110 designated by temporary file catalog information registered in a catalog information storage means 101. If a lack of the file capacity is detected while a data base use program 103 uses the work file by a work file input/output means 112, the area of the work file generated in the temporary work file generating storage means 110 is extended by a temporary work file dynamic extending means 113.