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.
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Showing 1 to 20 of 124 for “"Database Systems"”.
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Elastic database systems
Distributed on-line transaction processing (OLTP) database management systems (DBMSs) are a critical part of the operation of large enterprises. These systems often serve time-varying workloads due to daily, weekly or seasonal fluctuations in load, or because of rapid growth in demand due to a …
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Power-Performance Tradeoffs in Database Systems
With the total energy consumption of computing systems increasing at a steep rate, much attention had been paid to the design of energy-efficient computing systems and applications. So far, database system design has focused on improving the performance of query processing. The objective of this …
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Query Optimization for Relational Database Systems
This report develops a new algorithm for computing the Cartesian product and join of large relations which attempts to take maximum advantage of available main-memory buffer space.
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Performance models of distributed database systems
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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Domain Restrictive User Interfaces Using Database Systems
… end-user times to carry out tasks are held in a database system. Evaluations have been earned out to see how well generated interfaces in use match the predictions of the theoretical model developed in the thesis. The results of the evaluations show that the analytic based model successfully …
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Storing and Indexing Expressions in Database Systems
… web site personalization. In recent work, database techniques have been utilized for efficiently matching large number of expressions with data. These techniques include storing expressions as data in the database and then indexing these expressions to quickly identify expressions that …
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Virtual time synchronization in distributed database systems
Distributed systems synchronized by Virtual Time have been topics of recent interest. Virtual Time follows an optimistic philosophy relying on rollback for synchronization instead of abortion or blocKing Although many applications have been suggested as candidates for Virtual Time, few were …
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Managing malicious transactions in mobile database systems
Database security is one of the most important issues for any organization, especially for financial institutions such as banks. Protecting database from external threats is relatively easier and a number of effective security schemes are available to organizations. Unfortunately, this is not so in …
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Full-Stack Change Management for Database Systems
Database systems are at the core of modern applications, providing essential services for storing, querying, and managing data. However, they do not remain static; they continuously evolve in response to external changes. Two primary external factors drive this evolution. On the one hand, database …
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Optimizing the POX controller with database systems
… the current implementation by building a new database module. Topology dependent applications are now supported by both in-memory and persistent storage. Since the database component updates the changes of the network in the database in real time, it also servers as the key step to connect the …
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Concurrency Control in Real-Time Database Systems
A 'real-time database system (RTDBS)' is a database system designed to provide real-time information to data-intensive applications. Each RTDB transaction is associated with a timing constraint, typically in the form of a deadline. It is difficult, in a RTDBS, to meet all timing constraints due to …
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Distributed Deadlock Detection in Distributed Database Systems
Deadlock detection in distributed database systems is very complicated and difficult to handle because of the distributed nature of the system and the communication delay of the network. Many detection algorithms have been proposed in the past, but most of them have been shown to be incorrect and …
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Query execution in column-oriented database systems
… obvious ways to map a two-dimension relational database table onto a one-dimensional storage interface: store the table row-by-row, or store the table column-by-column. Historically, database system implementations and research have focused on the row-by row data layout, since it performs best …
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Query optimization for parallel object-oriented database systems
This thesis studies parallel query optimization for object-oriented queries. Its main objective is to investigate how performance improvement of object-oriented query processing can be achieved through processor parallelism.
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Cross-engine query execution in federated database systems
Duggan et al.have created a reference implementation of the BigDAWG system: a new architecture for future Big Data applications, guided by the philosophy that "one size does not fit all." Such applications not only call for large-scale analytics, but also for real-time streaming support, smaller …
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Detecting and tolerating Byzantine faults in database systems
… Byzantine faults in transaction processing database systems. The scheme compares answers from queries and updates on multiple replicas which are off-the-shelf database systems, to provide a single database that is Byzantine fault tolerant. The scheme works when the replicas are homogeneous, …
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A garbage-collecting associative memory for database systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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Exploiting fine-grain parallelism in transactional database systems
Current database engines designed for conventional multicore systems exploit a fraction of the parallelism available in transactional workloads. Specifically, database engines only exploit inter-transaction parallelism: they use speculation to concurrently execute multiple, potentially-conflicting …
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Integration of handheld computers into distributed database systems
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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