For example, in debugging problems where you suspect the join order is not optimal, it can be useful to gather counts for different join combinations.
比方说，在调试怀疑连接顺序不是最优的问题时，针对不同的连接组合收集计数可能会有帮助。
For the reason of the no order of space data, the algorithm based on join index have to improve for it. The key problem of optimal page-access sequence with a fixed Buffer has been analyzed.
空间数据的无序性，使得应用在其上的利用连接索引的算法需要进一步的改进，为此分析了其中关键的最佳页访问次序问题。
For the reason of the no order of space data, the algorithm based on join index have to improve for it. The key problem of optimal page-access sequence with a fixed Buffer has been analyzed.
空间数据的无序性，使得应用在其上的利用连接索引的算法需要进一步的改进，为此分析了其中关键的最佳页访问次序问题。
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