DBHistory - HistoryofSecondaryStorage & DatabaseSystems...

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History of Secondary Storage Database Systems
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Database Applications and Information  Systems CS 3380 Preliminaries 1951 Univac Computer uses magnetic tape  drive 1956 IBM offers first magnetic hard disk drive,  50 disk platters – 2 ft in diameter, holds 5Mb of  data 1961 Charles Brachman develops IDS, possibly  first DBMS….becomes IDMS
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Database Applications and Information  Systems CS 3380 Beginnings 1960’s – Computers begin to take hold as  a cost effective means for information  storage and data processing for large  companies. Two primary data models of the time:  network (CODASYL) and hierarchical  (IMS) Database access done through low-level  pointer/disk operations. 
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Database Applications and Information  Systems CS 3380 Beginnings … cont Specific knowledge of underlying file  and record structure required to process  or query data.  Design emphasis on the physical  structure of records, not logical  organization of files. SABRE system (IBM/AmericanAirlines)
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Database Applications and Information  Systems CS 3380 CODASYL  Conference on Data Systems  Languages Founded in 1957 by DoD Lead to the development of COBOL  programming language The Data Base Task group of  CODASYL developed the network  model of data records and storage.
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Database Applications and Information  Systems CS 3380 CODASYL and File  Processing The use of COBOL is closely tied to  traditional (i.e. pre-RDBMS) file  processing approach. Various applications  create/update/manage own specialty  files.
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Database Applications and Information  Systems CS 3380 IMS Designed by IBM for NASA Apollo  program Still in use in “legacy systems” such as  the IBM z/OS
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This note was uploaded on 11/06/2010 for the course PHYSICS 1220 taught by Professor Yung during the Fall '09 term at Missouri (Mizzou).

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DBHistory - HistoryofSecondaryStorage & DatabaseSystems...

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