By Thomas M. Connolly
This ebook takes a clean, pragmatic method of database platforms. With a robust layout concentration and utilizing life like case reports all through, readers can grasp an available, step by step technique, the best way to follow this to layout and construct purposes, and achieve an exceptional realizing of the problems desirous about development the platforms.
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Extra resources for Database Systems: A Practical Approach to Design, Implementation and Management
For example, the Locus , Ficus , and Coda  distributed file systems all include mechanisms for automatically resolving certain classes of conflicting directory operations. Other systems, like Lotus Notes , do not provide application-specific mechanisms to handle conflicts, but rather create multiple versions of a document, file, or data object when conflicts arise. Bayou's dependency checks and merge procedures are more general than these previous techniques. 1. Dependency checks Each update is associated with a dependency check: an application-supplied query and its expected results.
Milani et al. / Data Object Storage in Large Scale Distributed Systems D. Karger, E. Lehman, F. Leighton, M. Levine, D. Lewin and R. Panigrahy, Consistent hashing and random trees: Distributed caching protocols for relieving hot spots on the world wide web, Proceedings of the 29th Annual ACM Symposium on Theory of Computing, 1997. F. Dabek, M. F. Kaashoek, D. Karger, R. Morris and Ion Stoica, Wide-area cooperative storage with CFS, Proceedings of the eighteenth ACM symposium on Operating systems principles, 2001.
Data Object Storage in Large Scale Distributed Systems a) b) c) Figure 8. The update mechanism in Oceanstore: an example. Object replication follows a two-tier approach. A specific small set of servers, called the inner ring of the object, are the primary owners of the object and store the primary replicas (primary tier). Other replicas, called secondary, are held by a large number of nodes mostly for caching reasons (secondary tier). Objects in Oceanstore are modified through updates. Every object in Oceanstore is read-only, so any update to an object creates a new version.