[PDF] Top 20 Approximate rewriting of queries using views

... Q using the viewset ...the rewriting is much more critical than the speed of generation of the rewriting, for example in applications where the rewriting is obtained once, and then executed ... See full document

... optimizing queries in the presence of materialized ...SQL queries have bag-theoretic seman- tics (duplicates are not eliminated unless explicitly re- ...designing views to answer queries in ... See full document

... the views in V), in the secret query Q. We will be referring to all queries R over schema V as “rewritings” (in terms of V), as indeed they would be defined in terms of the relation symbols in V ...such ... See full document

... materialized views or indexes, are routinely used in data-intensive systems to improve query-evaluation ...of queries, a database, and a set of constraints on derived data ...the queries. Automated ... See full document

... RSI) queries and LSI (or RSI) views satisfying the non-union conditions C1 and ...the queries do not need to be ...containing rewriting might not exist in the language of conjunc- tive ... See full document

... that can be treated as tasks. Incorporation of any classes of tasks, including indexes, in our stage-one algorithms is orthogonal to the query/view/rewriting languages to which the algorithms are applicable. Note ... See full document

... materialized views to efficiently process a given set of ...all views is not possible because of the space constraint and maintenance cost ...Materialized views is one of the most important decisions ... See full document

... offers a limited interaction layer. After all, protecting data may require additional measures, like withholding from certain users certain information that is, most likely, not crucial for many applications. From these ... See full document

... Query rewriting using views is a technique for answering a query using a set o f views instead of accessing the database relations ...equivalent rewriting using ... See full document

... relations. Queries on views are well dened; translation of view updates into base relations is not dened, in ...treat views as if they were real relations, and the system replaces references to ... See full document

... As an example of the structural rules S5-S8, consider the signature Alice, John, Jill, Jenny, Kelly, Mary E person, father : person person, E = sister, aunt : person --* {person}, female[r] ... See full document

... (e.g., using georeferenced Tweets to train classifiers [66] or benchmark data to develop methods to locate images and videos [10]) suggests that joint resources can rapidly acceler- ate ... See full document

... Information Retrieval (IR) applications have been notoriously resistant to improvement attempts by Natural Language Processing (NLP). With a few exceptions for specialized tasks, 1 the contribution of part-of-speech ... See full document

... where the derivation has, so far, generated some terminal symbols (the lower-case letters), two in- stances of the non-terminal A and one instance of B. The configuration keeps track of where the symbols generated by the ... See full document

... Since each step of computation is fired by some local conditions in the whole graph, it is well known that one has no grip on the sequence of rewriting steps. The more rules, the more interaction between rules, ... See full document

... query using terms chosen from the relevant documents in the top 20 retrieved ...all queries, each combination of cut-offs was ...more queries: it was a more stable improvement over the AQE ... See full document

... The paper evaluates the AS prototype to discover (1) whether the system scales given enough parallelism of suitable granularity, and (2) whether the trace cost model can predict granularity with sufficient accuracy to ... See full document

... Boolean queries by instances,” [4] This project allows the client toanalyze and verifyall the quantified queries,a set of database queries known to be very difficult for all but the most expert users ... See full document

... design used semantic input into its information In such parser in which the target attribute identification Using, an idea a query "What street, city as target attributes the Masters The[r] ... See full document

... The (consistent) force vector at the points along the radial line θ = 0 can be obtained, for the incident and reflected wave fields by expressing the modal stresses in terms of the displacement wave functions and ... See full document