How to Tell if the I/O of the Database is Slow - 2
IO的类型： 平均响应时间直接关联到具体的IO类型： 1. 读或写 2. 单块或多块 单块IO，指一次只读一个块。例如，当一个session等待一个单块IO时，典型的等待事件就是“db file sequential read”，表明正在等待需要的块。 多块读指的是一次读多个块，从2到128个Oracle块不等，依赖于块的大小与操作系统设置。通常一个多块请求容量上有1MB的限制。例如当一个sess
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