OpenVMS(Open Virtual Memory System, 이전 이름: VAX-11/VMS, VAX/VMS, VMS)는 VAX, 알파, 아이테니엄 기반 계열의 컴퓨터에서 동작하는 고성능 서버 운영 체제이다. 이름에서 "오픈"(open)이라는 낱말이 들어가 있지만 OpenVMS는 오픈 소스 소프트웨어가 아니다. 그러나 구매를 하면 소스 목록 작성을 이용할 수 있다. OpenVMS, oorspronkelijk genaamd VMS (van Virtual Memory System) is het 32-bits besturingssysteem dat computerbedrijf Digital Equipment Corporation ('DEC' of kortweg 'Digital') ontwikkelde voor zijn VAX-minicomputerserie.. In 1978 is het op de markt gekomen. VMS was het eerste besturingssysteem met virtueel geheugenbeheer. Later ontwikkelde Digital de 64-bits … OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing virtual memory-based operating system designed to support time-sharing, batch processing, transaction processing and workstation applications. It was first announced by Digital Equipment Corporation as VAX/VMS (Virtual Address eXtension/Virtual Memory System) alongside the VAX-11/780 minicomputer in … ISAM (an acronym for indexed sequential access method) is a method for creating, maintaining, and manipulating computer files of data so that records can be retrieved sequentially or randomly by one or more keys.Indexes of key fields are maintained to achieve fast retrieval of required file records in Indexed files. IBM originally developed ISAM for mainframe computers, but … OpenVMS (Open Virtual Memory System) は、ディジタル・イクイップメント・コーポレーション (DEC、現在はヒューレット・パッカード・エンタープライズ) によって設計された、タイムシェアリングシステム、バッチ処理およびトランザクション処理用のオペレーティングシステ …