| Sahiplik | Değer |
| İsim | What is an Object Oriented Database? Ob |
| Açıklama | What is an Object Oriented Database? Object Oriented Databases (ODBMS) store data together with the appropriate methods for accessing it i.e. encapsulation. Relational databases " hammer the world flat" by normalisation. Relational database of a cat: Object-oriented database of a cat: This enables: complex data types to be stored (e.g. CAD applications) a wide range of data types in the same database (e.g. multimedia applications) easier to follow objects through time (e.g. "evolutionary applications") Applications The first areas where ODBMS were widely used were: CASE CAD CAM Increasingly now used in: telecommunications healthcare finance multimedia text/document/quality management These are the next-generation applications" where traditional IT methods have often not impacted. For example, it has been estimated that up to 90% of the data held in businesses is still paper-based, because a large amount of data is not record oriented. History of Databases file systems (1950s) store data after process created it has ceased to exist hierarchical/ network (1960s) concurrency recovery fast access complex structures relational (1970-80s) more reliability less redundancy more flexibility multiple views ODBMS (1990s) better simulation more (and complex) data types more relationships (e.g. aggregation, specialisation) single language for database AND programming better versioning no reconstruction of objects other OO advantages (reuse, inheritance etc.) How do ODBMS Work? Example: Relational Model of Student-Course Relationship STUDENT Student# StudentName Address 1 jane jones 6 The High Street 2 brian brown 104 Park Avenue 3 clara clarke 97 Gilmore Street 4 sally smith 68 Lemon Grove 5 tom taylor 53 London Road STUDIES Student# Course# 1 C1 2 T2 3 T2 4 Q9 5 ... |
| Dosya Adı | Bağlantı www.edubilim.com_bilim-29-5.doc |
| Dosya Boyutu | Link |
| Dosya Tipi | doc (Mime Tipi: link) |
| Ekleyen | admin |
| Ekleme tarihi: | 07.10.2008 16:13 |
| İnceleyenler | Herkes |
| Kontrol Eden | Editor |
| İndirme sayısı | 1 İndirme sayısı |
| En son güncelleme | 07.10.2008 16:14 |
| Anasayfa | http://www.edubilim.com |
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