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Finally, I will introduce the parallel query evaluation mode of PBASE/2, which is the basis and springboard of parallel query processing. 最后提出了PBASE／2的并行查詢執(zhí)行計劃模型，并行查詢執(zhí)行計劃模型是并行查詢處理的基礎和出發(fā)點。
In order to cut down the enormous search space of parallel query optimization, PBASE/2 divides parallel query processing into two phases, sequential optimization and parallelization. 為了縮減并行查詢優(yōu)化龐大的搜索空間，PBASE/ 2將并行查詢優(yōu)化劃分為順序優(yōu)化和并行化兩個階段。