How to Tell if the I/O of the Database is Slow - 2
IO的類型： 平均響應時間直接關聯到具體的IO類型： 1. 讀或寫 2. 單塊或多塊 單塊IO，指一次只讀一個塊。例如，當一個session等待一個單塊IO時，典型的等待事件就是「db file sequential read」，表明正在等待需要的塊。 多塊讀指的是一次讀多個塊，從2到128個Oracle塊不等，依賴於塊的大小與操作系統設置。通常一個多塊請求容量上有1MB的限制。例如當一個sess
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