INDEX PRODUCTION SYSTEM FOR DATA BASE

摘要

PURPOSE:To reduce a processing load by using an I/O system data base machine to segment indexes in an index producing process. CONSTITUTION:The I/O system data base machine 4 reads a record within a range designated by a data base and checks whether a normal record is equal to an overflow originator record or an overflow receiver record. Then key values needed for production of an index are outputted to a data base control system set at the host side in different formats including positions on the data base of the relevant record. The data base control system converts the index segmenting results of the overflow originator and receiver records into the records needed for production of an index out of those three types of records. The converted record and the index segmenting result of the normal record are sorted with the key values by means of a CPU system data base machine 3. Then an index is produced with use of these sorted records.