By Jennifer Widom
Active database structures increase conventional database performance with robust rule-processing services, delivering a uniform and effective mechanism for lots of database approach functions. between those purposes are integrity constraints, perspectives, authorization, records accumulating, tracking and alerting, knowledge-based platforms, professional structures, and workflow administration. this crucial assortment makes a speciality of the main admired study tasks in energetic database structures. The venture leaders for every prototype process offer particular discussions in their initiatives and the relevance in their effects to the way forward for lively database platforms. * A vast assessment of present lively database structures and the way they are often prolonged and superior * A complete creation to the center issues of the sphere, together with its motivation and heritage * insurance of lively database (trigger) services in advertisement items * dialogue of coming near near criteria
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OceanStore supports two types of data access control which are reader restriction and writer restriction. The former prevents unauthorized reads by encrypting all data in the system. The latter prevents unauthorized writes by signing all the write operations. For high availability and reliability, every object has multiple replicas dispersed in the network. 5 Storage 47 is vulnerable to the single point of failure. OceanStore improves the scheme that it hashes each GUID with different salt values.
Chapter 4 DHT Applications Like Pythagorean theorem and Newton Law, excellent theories are always simple and graceful. DHT, which performs so graceful that only two basic operations: get data from DHT and put data into DHT, is wildly used in many aspects of applications. In this chapter several DHT applications will be discussed. DHT forms an infrastructure that can be used to build more complex services, such as multicast, anycast, distributed file systems, search, storage, content delivery network, file sharing, and communication.
Even if hundreds of millions of computers work as the distributed search engine peers, the engine would have more capability than the largest traditional search engine. From this point of view, the distributed search engine has infinite processing ability, unlimited storage space and very high bandwidth to solve all kinds of search queries form billions of users, which is much stronger than any centralized engine. In the distributed searching, how to store and manage the huge distributed index database is the key challenge.