Efficiency of the PLATOON Federated Query Processing Strategies Sample Clauses

Efficiency of the PLATOON Federated Query Processing Strategies. The efficiency of the developed FQP is measured in terms of the time required to produce all the answers to a query (i.e., elapsed time). The ten queries were run using the three federated query engines previously described with a timeout of 10 minutes; all the caches are flushed between the execution of two queries to ensure reproducibility. The block or “paginating” is configured to 10,000 answers. Table 7 reports the elapsed time (secs) to produce the first result of three query execution strategies. The percentage of improvement concerning the baseline approach is also reported. As observed, the speed up to the first result is especially high for executing non-selective queries (i.e., Q3 and Q4) with EG_FQP and the PLATOON federated query engine FQP. The studied federated query processing strategies also speed up the baseline approach for the other queries. Table 7: Elapsed time (in secs.) to the first answer of five queries executed over Pilot 2a knowledge base. Best results are highlighted in bold. FQP is producing the first answer first for the queries Q1, Q2, Q4, and Q5. EG_FQP produces the first answer for query Q4 slightly earlier than FQP. Both approaches manage to produce results earlier than the baseline.
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