[PDF] Top 20 SPARQL Query Optimization for Structural Indexed RDF Data

... framework, RDF, is a standard language model for representing semantic ...semantic data will become increasingly more important. Efficient management of RDF data is one of the key research ... See full document

... between SPARQL and relational algebra [2], ...in SPARQL . For instance, the work by P. Roy et al. [27] represented query plans in AND-OR DAGs and used heuristics to partially materialize intermediate ... See full document

... the query which needs to be processed in a very short ...million RDF triples in the experiment, which represent all the political divisions of China and their coordinates (latitudes and ...million ... See full document

... to query for triples from an RDF database (or triple ...Structured Query Language (SQL) used to get data from a relational ...that data is stored in fixed tables with a foreign key ... See full document

... Web query processing, SPARQL query engines can be categorized into two categories: SQL-based and RDF native query en- gines ...SQL-based query engines rely on relational database ... See full document

... specific query evaluation engine inside the data management ...that optimization techniques implemented directly in the query engine should make the system very efficient for query ... See full document

... scale data (Big Data) analysis is an important topic in Cloud Computing, which required complex data ...Big data analysis can be done efficiently done using MapReduce process. RDF is ... See full document

... of SPARQL queries that are embedded in a Java ...of RDF data, SPARQL queries, and SPARUL update ...a query has a non-empty result ...and optimization of OPTIONAL graph patterns ... See full document

... of SPARQL queries over RDF ...from RDF data and efficiently build an inverted index structure based on the set of selective ...the query proces- sing, we find the indexed grams ... See full document

... from structural analysis for recommending the best queries ...a SPARQL query q o that a source RDF dataset D S is able to answer, reformulates it into queries that can be answered by a target ... See full document

... Writing SPARQL Queries ...writing SPARQL queries ...a SPARQL query editor improved with syntax highlighting, and (b) our tool ...of SPARQL queries, they were given the list of classes ... See full document

... a Query Language for RDF graph traversal (SPARQL Query Language Specification) a Protocol Layer , to use SPARQL via http (SPARQL Protocol for RDF Specification).. an XML Output Format[r] ... See full document

... temporal RDF using named ...of RDF triples with temporal validity ...T- SPARQL, an extension to express temporal ...temporal RDF and τ -SPARQL approach enables queries that are either ... See full document

... the query processing ...the query patterns is covered using one or more RDFMatView ...the query is pre-computed and persistently stored allowing to retrieve its results without searching directly in ... See full document

... general RDF graphs we consider are unstruc- tured; our technique blindly traverses the input RDF graphs to anti-unify their triples with same property, and captures their common structure across these ... See full document

... 3.5 Select expression Using evaluable expressions in the select clause, as shown above, enables us to identify and isolate part of an XML DOM tree using XPath. The result of the XPath evaluation is stored in a transient ... See full document

... into SPARQL Trying the translation sketched above on the query in Example 6 we observe that we would not obtain any answers, as no triples in the dataset would match the triple pattern ?P rdf:type ... See full document

... streaming RDF /SPARQL engines, completely based on real-world data sets from the Linked Open Data ...streaming data but not enough tools to gain knowledge from them, researchers have ... See full document

... of RDF triples. Every query exe- cution may produce from a minimum of zero triples to a maximum of an entire ...the query execution time only, and is not taken from the triples that match the patters ... See full document

... online 6 . We evaluate different combinations of the summarization measures we define. For the scenario without F L, we also compare our summaries to sentence graph summarization – denoted as S SG . We evaluate evaluate ... See full document