By Mario Piattini
Here's a thorough advent to the newest advancements in database platforms layout provided from an functions perspective. that includes contributions from famous specialists within the box, this new e-book can pay specified cognizance to matters raised through new developments in database layout, and the way those advancements have an effect on the programmer and database administrator. The authors and editors current innovations in an intuitive and motivating demeanour, making huge use of examples, and together with lists of references for extra research with each one bankruptcy.
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Extra info for Advanced Database Technology and Design
In those DBMSs, besides the description of the data and the constraints, part of the control information is stored in the DB. Active DBs can run applications without the users intervention by supporting triggers, rules, alerts, daemons, and so on. Finally, we are witnessing the appearance of object-oriented (see Chapter 7) and object-relational (see Chapter 6) DBMSs, which allow the definition and management of objects (encapsulating structure and behavior). Objects stored in DBs can be of any type: images, audio, video, and so on.
1, an IS may also have an active function. In the active function, the users may delegate to the system the generation of some events that change the state of the domain when some conditions hold. A generated event is an event induced directly by the IS. Without the participation of the system, the event would not be generated, and, therefore, the domain would not change. The system may generate an event as a response to an explicit request from users, when it detects that the state of the domain 42 Advanced Database Technology and Design satisfies some condition, or because it considers the event necessary to achieve an objective defined by the users.
Concurrency control and recovery in object database management systems (ODMS) require research into new techniques (long transactions that may last for days and long-term checkout of object versions). Traditional logging and locking techniques perform poorly for long transactions and the use of optimistic locking techniques as well as variations of known techniques (such as shadow paging) may help to remedy the lock and log file problems . Evolution and Trends of Database Technology 17 To facilitate the effective use of the DB hardware and software resources, the DB administrator (DBA) is necessary.