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oracle Oracle 10g(10.1.0.2)中的OPTIMIZER_INDEX_COST_ADJ Tom Kyte的新书Effective Oracle by Design的第6章 Getting the Most Out of the Cost-Based Optimizer中介绍了参数OPTIMIZER_INDEX_COST_ADJ,并认为可以理解为Oracle执行多块(MultiBlock)I/O(比如全表扫描)的代价与执行单块(Single-block)I/O代价的相对比例.T
Generic type instantiations范型实例化 Similar to a non-generic type, the compiled representation of a generic type is intermediate language (IL) instructions and metadata. The representation of the generic type of course also encodes the existence and use