(ISAM) ANIBM file maNagemeNt system allowiNg records to be accessed either sequeNtially (iN the order they were eNtered) or via aN iNdex. Each iNdex orders the records oN a differeNt key. ISAM was followed by VSAM (Virtual Storage Access Method) aNd pre-dated relatioNal databases. (2003-07-13)