Because the DB2 optimizer does not know the values of the parameter markers in the prepare phase, a one-size-fits-all access plan is generated that cannot be optimal in all cases.

由于DB 2优化器在准备阶段不知道参数标记的值，因此生成了一个在所有情况下都不是最优的万能(one - size - fits - all)访问计划。

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Phase encode spreading optical code division multiplex access (OCDMA) communication system is one of the research focuses in recent years.

相位编码扩谱光码分多址（OCDMA）通信系统是近年来OCDMA研究的热点之一。

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