By Cornelius T. Leondes
Database and information verbal exchange community Systems examines the usage of the net and native Area/Wide region Networks in all parts of human recreation. This three-volume set covers, between different subject matters, database platforms, info compression, database structure, facts acquisition, asynchronous move mode (ATM) and the sensible program of those applied sciences. The overseas choice of individuals was once culled from exhaustive study of over 100,000 similar archival and technical journals.
This reference should be crucial to engineering and machine technological know-how libraries, examine libraries, and telecommunications, networking, and desktop businesses. It covers a various array of issues, including:
* innovations in rising database procedure architectures
* thoughts and functions in facts mining
* Object-oriented database systems
* information acquisition at the WWW in the course of heavy client/server site visitors periods
* info exploration at the WWW
* schooling and coaching in multimedia database systems
* facts constitution concepts in fast prototyping and manufacturing
* instant ATM in info networks for cellular systems
* purposes in company finance
* clinical information visualization
* info compression and knowledge retrieval
* strategies in scientific platforms, in depth care devices
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Additional info for Database and Data Communication Network Systems, Three-Volume Set: Techniques and Applications
When an instance is deleted, the reference integrity constraint is violated. The system can totally ignore the violation or maintain a reference count. The reference count records the number of references connected to other objects. An object can be deleted when the count is zero. (2) An object will be removed automatically when no references are associated with it. 5. Integrity constraints. Integrity constraints are used to maintain the consistency and correctness of data by domain and referential integrity constraints.
Both constraints and triggers are mainly used for active maintenance of database consistency. Gehani and Jagadish also suggested three kind of triggers: 1. Once-only triggers. The once-only triggers are deactivated after the triggers are fired and the actions are completed. If they are going to be used later, they need to be reactivated. For example, if the inventory is lower than the reorder level, a trigger is fired to place a new order. Then this trigger needs to be deactivated. Otherwise, the trigger will place orders several times.
10] are adopted in this research. Consequently, rules are not included in the active object-oriented database. 2. Constraints, A constraint is used for internal consistency maintenance. Unlike the static knowledge of rules, a constraint is the representation of either static (state variable x) or dynamic (state changing variable Ax) knowledge. For example, the statement that an employee's salary must not be below the minimum salary is a static constraint while the statement that an employee's salary cannot decrease is a dynamic constraint .