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 6 of 6 for “"Materialized views"”.
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Automatic physical database design : recommending materialized views
… while focusing on the problem of selecting materialized views for improving the performance of a database system. We first address the satisfiability and implication problems for mixed arithmetic constraints. The results are used to support the construction of a search space for view …
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Multiverse databases for secure web applications
… of streaming data-flow systems and low-overhead materialized views. When a new user session starts, the system creates data-flow nodes to support the user queries and automatically inserts special nodes to enforce security policies at universe boundaries. MultiverseDB provides fast reads by …
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BlendDB : blending table layouts to support efficient browsing of relational databases
… BlendDB provides commensurate performance to materialized views while using less disk space, and can achieve better performance than materialized views in exchange for more disk space when users navigate between related items in the database.
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Semantics and efficient evaluation of partial tree-pattern queries on XML
… of techniques for answering TPQs using materialized views. Non-main-memory XML query evaluation can be done in two modes (which also define two evaluation models). In the first mode, data is preprocessed and indexes, called inverted lists, are built for it. In the second mode, data are …
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Development of new data partitioning and allocation algorithms for query optimization of distributed data warehouse systems
… data, contrary to redundant techniques like materialized views and indexes. The warehouse partitioning problem is concerned with determining the set of dimension tables to be partitioned and using them to generate the fact table fragments. In this work an enhanced grouping algorithm that …
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Correlation indices : a new access method to exploit correlated attributes
… data structures - like bitmap indices, materialized views, or cubes - to answer queries directly. This thesis presents a new index data structure called a correlation index (CI) that enables OLAP databases to answer a wider range of queries from a single clustered index or sorted file. …