云環(huán)境下海量語(yǔ)義數(shù)據(jù)的查詢策略
[Abstract]:In order to efficiently query massive RDF data, the storage method of RDF data in distributed database HBase is studied. The two-stage query strategy of massive RDF data is designed based on MapReduce, and the query is divided into SPARQL preprocessing stage and distributed query execution stage. SPARQL preprocessing stage is designed to implement the query partition algorithm JOVR, based on SPARQL variable correlation degree. The join order of the join variables is determined by calculating the correlation degree of the variables in the SPARQL query statement, and the join operation of the SPARQL clause is divided into the smallest number of MapReduce tasks according to the join variables. In the distributed query execution phase, the MapReduce tasks divided by the SPARQL preprocessing phase are executed, and the parallel query for massive RDF data is realized. The query strategy is verified by LUBM standard test data set. The research results show that the JOVR algorithm can efficiently query the massive RDF data, and has strong stability and scalability.
【作者單位】: 中南大學(xué)軟件學(xué)院;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(61301136,61572525,61602525)~~
【分類號(hào)】:TP311.13
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