Qiang Zhu and P.- A. Larson, A fuzzy query optimization approach for multidatabase systems, International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, 5 (1997) 701 - 22. Home/Search Document Not in Database Summary Related Articles Check |
This paper is cited in the following contexts:
Classifying Local Queries For Global Query Optimization In.. - Zhu Self-citation (Zhu Larson) (Correct)
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Qiang Zhu and P.- A. Larson, A fuzzy query optimization approach for multidatabase systems, International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, 5 (1997) 701 - 22.
Developing Cost Models with Qualitative Variables for.. - Zhu, Sun, Motheramgari (2000) (3 citations) Self-citation (Zhu) (Correct)
....first identified. The corresponding cost model is retrieved from the catalog and used to estimate the cost of the query. Based on the estimated local costs, the global query optimizer chooses a good execution plan for a global query. There are several other approaches to tackling this problem. In [16], Zhu and Larson introduced a fuzzy method based on fuzzy set theory to derive cost models in an MDBS. In [10] Naacke et al. suggested an approach to combining a generic cost model with specific cost information exported by wrappers for local DBSs. In [1] Adali et al. suggested to maintain a ....
Q. Zhu and P.- A. Larson. A fuzzy query optimization approach for multidatabase systems. Int'l J. of Uncertainty, Fuzziness and Knowledge-Based Sys., 5(6):701 -- 22, 1997.
Solving Local Cost Estimation Problem for Global Query.. - Zhu, al. (1998) (4 citations) Self-citation (Zhu Larson) (Correct)
....to solve this crucial problem for global query optimization in an MDBS. In general, if an autonomouscomponent DBS is viewed as a black box whose optimization information is hidden from the global optimizer, there are three potential approaches to obtain or estimate local optimization information [26, 28]: ffl performing some testing queries to test the black box; ffl guessing necessary information subjectively based on external characteristics of and previous knowledge about the black box; ffl monitoring the behavior of the black box at run time and dynamically collecting necessary ....
....carefully designed probing queries on a component database to probe and deduce some optimization information. In fact, sample queries can be considered as a special type of probing queries. In [25] Zhu discussed the issues faced in estimating selectivities of queries in an MDBS environment. In [26, 28], we also proposed a fuzzy optimization method which belongs to the second approach. The idea is to build a fuzzy cost model based on experts knowledge, experience and guesses about the required optimization parameters and perform fuzzy query optimization based on the fuzzy cost model. Our ....
Qiang Zhu and P.-A. Larson. A fuzzy query optimization approach for multidatabase systems. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, 5(6):701--22, 1997.
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