Abraham Silberschatz

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The production environment for analytical data management applications is rapidly changing. Many enterprises are shifting away from deploying their analytical databases on high-end proprietary machines, and moving towards cheaper, lower-end, commodity hardware, typically arranged in a shared-nothing MPP architecture, often in a virtualized environment(More)
As peer-to-peer (P2P) emerges as a major paradigm for scalable network application design, it also exposes significant new challenges in achieving efficient and fair utilization of Internet network resources. Being largely network-oblivious, many P2P applications may lead to inefficient network resource usage and/or low application performance. In this(More)
One of the central problems in the eld of knowledge discovery is the development of good measures of interestingness of discovered patterns Such measures of interestingness are divided into objective measures those that depend only on the structure of a pattern and the underlying data used in the discovery process and the subjective measures those that also(More)
We study the problem of discovering association rules that display regular cyclic variation over time. For example, if we compute association rules over monthly sales data, we may observe seasonal variation where certain rules are true at approximately the same month each year. Similarly, association rules can also display regular hourly, daily, weekly,(More)
One of the central problems in the eld of knowledge discovery is the development of good measures of in terestingness of discovered patterns Such measures of interestingness are divided into objectivemeasures those that depend only on the structure of a pat tern and the underlying data used in the discovery process and the subjective measures those that(More)
A multidatabase system (MDBS) is a facility that allows users access to data located in multiple autonomous database management systems (DBMSs). In such a system, <i>global transactions</i> are executed under the control of the MDBS. Independently, <i>local transactions</i> are executed under the control of the local DBMSs. Each local DBMS integrated by the(More)
Relaxing the assumption that relations are always in First-Normal-Form (1NF) necessitates a reexamination of the fundamentals of relational database theory. In this paper we take a first step towards unifying the various theories of &#172;1NF databases. We start by determining an appropriate model to couch our formalisms in. We then define an extended(More)