Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 2592 for “"Databases"”.
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Aggregation in temporal databases
… implemented as simple extensions to relational databases. We introduce a taxonomy of temporal aggregation, based on a study of all major temporal query languages containing aggregates. The taxonomy categorizes the expressiveness and functionality of temporal aggregation. Based on this taxonomy, …
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Truth finding in databases
Restriction data tranferred 2014-07-01T11:36:02-05:00 Original Data Group with Access Administrator Release Date: 2015-02-03 13:47:48 UTC Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system
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Database consistency in cloud databases
… solutions being offered to deploy transactional databases in a cloud platform. The maintenance of ACID (Atomicity, Consistency, Isolation and Durability) properties is the primary obstacle to the implementation of transactional cloud databases. The main features of cloud computing: scalability, …
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Trustworthy data from untrusted databases
… arises due to the untrusted environments that databases are subjected to, we need mechanisms to ensure that the database operations are executed following these principles. In this dissertation, we revisit some of these principles to understand what we should expect when a transaction execution …
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Breaking and Building Encrypted Databases
The subject of this thesis is encrypted databases: systems that use novel cryptographic techniques to store and efficiently query encrypted data. Motivated by the increasing frequency and severity of harmful data breaches, encrypted databases keep data encrypted at all times, ensuring that it is …
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Visually querying object-oriented databases
… query system for ODMG-compliant object-oriented databases, called QUIVER. QUIVER has a comprehensive expressive power; apart from supporting data types such as sets, bags, arrays, lists, tuples, objects and relationships, it supports aggregate functions, methods and sub-queries. The language is …
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Design Foundations of Graph Databases
… graph data modelling best practices arise. Graph databases are perceived as very intuitive and our research will provide evidence to showcase their benefits. One of our main contributions is formalising the observation that hierarchical property graphs provide a graph semantics to the …
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Clustering strategies for object databases
When object databases arrived on the scene some ten years ago, they provided database capabilities for previously neglected, complex applications, such as CAD, but were burdened with one inherent teething problem, poor performance. Physical database design is one tool that can provide performance …
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Automatic Updating of Cartographic Databases
To update a portion of an existing cartographic database, the common practice is to relate a new data file to an existing file by means of survey control points that are included in both files. The two digital maps may have different scales, different coordinate systems, and no identifying …
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Managing Rules in Active Databases
Traditional databases are viewed as passive repositories of data. We store, retrieve, and alter data in a database, but do not expect a database to respond to actions performed to it. This passive paradigm is now rapidly changing as databases incorporate rules which permit them to detect and …
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Query optimization in distributed databases
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Graph analytics on relational databases
… Conventionally, data is stored in relational databases that have been refined over decades, resulting in highly optimized data processing engines. However, the awkwardness of expressing iterative queries in SQL makes the relational query-processing model inadequate for graph analytics, leading …
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Negation in logic and deductive databases
… thesis studies negation in logic and deductive databases. Among other things, two kinds of negation are discussed in detail: strong negation and nonmonotonic negation. In the logic part, we have constructed a first-order logic CF 0 of strong negation with bounded quantifiers. The logic is based …
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Modeling image databases using Xml schema
This thesis presents a model for still images in order to support content-based querying and browsing by hierarchical tree structures and object relational graphs. We use the extensible markup language (XML) schema to illustrate and exemplify the proposed model because of its interoperability and …
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Managing Uncertainty and Ontologies in Databases
… semantic relationships between the terms in the databases. As such information is usually absent from traditional databases, there is tremendous opportunity to ask new kinds of queries that could not be handled in the past. This provides new challenges on how to manipulate and maintain such new …
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DataSpread: scaling spreadsheets using relational databases
… DataSpread, a system that holistically unifies databases and spreadsheets with a goal to work with massive spreadsheets: DataSpread retains all of the advantages of spreadsheets, including ease of use, ad-hoc analysis and visualization capabilities, and a schema-free nature, while also adding …
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An analytical study on image databases
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Decentralized information flow control for databases
… information. Many of these breaches involve databases that handle information for a multitude of individuals, but databases don't provide practical tools to protect those individuals from each other, so that task is relegated to the application. This dissertation describes a system that …
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