RECORD ADDING PROCESS SYSTEM FOR FILE OF INDEXED SEQUENTIAL ORGANIZATION

摘要

PURPOSE:To effectively use a store area by storing the records after transferring them as necessary if the blocks before and after the block that should store the added records have the record store areas even though the block to store the additional records has no record store area. CONSTITUTION:When the addition of a record is requested, a data area retrieving means 5 retrieves a block to store the record and at the same time decides whether this block has a record store area or not. If not, a data area securing means 6 decides whether the block following or preceding the relevant block has a record store area or not. If so, an index information updating means 7 decides whether the record to be added can be directly stored or not. If not, the record to be added is replaced with a record to be transferred. At the same time, the representative key value of each block is updated and stored in a data store means 8. As a result, a storage area is effectively used.