Yao, Z., Chen, C., and Roussopoulos, N., "Adaptive Cost Estimation for Client-Server based Heterogeneous Database Systems," University of Maryland Report, CS-TR-3648, May 1996.  Home/Search   Document Details and Download   Summary   Related Articles

....in the execution of single operations that are sensible to the available buffer size: 1) choosing between a sequential scan and an index scan with an unclustered index, and 2) choosing between a nested loops with an index scan over the inner relation and a hash join. Several research papers [DKS92, YCR96, ZL96] address the issue of query cost estimation for heterogeneous DBMSs. In all these papers, the authors use a calibration process for some predefined analytical models. DKS92] establishes a calibration method to extract for a predefined analytical cost model its parameter values that depend on the ....

....for a predefined analytical cost model its parameter values that depend on the platform and the DBMS. A benchmark is executed on a system to measure its performance, and an equation system is then constructed and resolved. This process produces a calibrated cost model for a specific platform. [YCR96] and [ZL96] use the same process to approximate the execution cost of a query in a heterogeneous environment by executing some predefined queries on the target DBMS with different result sizes. Contrary to [DKS92] where basic operations are modeled, in [YCR96] and [ZL96] global queries are ....

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Yao, Z., Chen, C., and Roussopoulos, N., "Adaptive Cost Estimation for Client-Server based Heterogeneous Database Systems," University of Maryland Report, CS-TR-3648, May 1996.

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