Flexible database management system for a virtual memory machine
Jane B. Grimson · ERA · 1980
47 3.5.1 Terminal security 48 3.5.2Physical data protection 49 3.5.5LoIcal dataprotection 50 page Chapter Lf Concurrent update in databases 51 4.1 Introduction 51 4.2 Guidelines for solution to concurrent update problem 51 4.2.1 Discussion of the requirements 53 4.3 Existing approaches to concurrent update 55 4.3.1 CODASYL 55 4 .3.2 INS/2 57 4.3.3DMS 1100 .58 4.3.4PRINE 59 4.3.5 Chamberlin et al's solution 60 4.4 Summary of approaches to concurrent update 63 4.4.1 Ninimum locking .64 4.4.2Over-locking 66 Chapter 5 The CODASYL Proposals 69 5.1 Introduction.69 5.2 Elements of the CODASYL Proposals 70 5.2.1 The Data Description Language 70 5.2.2The Data Nanipulation Language 71 5.2.3 Data structures 71 5.2.4The set concept 73 5.2.5 The storage-schema and Data Storage Description Language 76 5.3 An assessment of the CODASYL Proposals 78 5.3.1 The AREA concept 78 5.3.2The role of schema and subschema 79 5.3.3Sets 81 5.3.4Index structures .