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db file scattered read官網解釋：This event signifies that the user process is reading buffers into the S
Oracle Study之--Oracle等待事件（7） Free buffer waits 當一個會話將數據塊從磁盤讀到內存中時，它需要到內存中找到空閑的內存空間
Oracle Study之--Oracle等待事件（2）Control file parallel write當數據庫中有多個控制文件的拷貝時，Oracle 需要保證信息同步地寫到各個控制文件當中，這
free buffer waits官網解釋： This wait event indicates that a server process was un
Oracle Study之--Oracle等待事件（3）Db file parallel read這是一個很容易引起誤導的等待事件，實際上這個等待事件和并行操作（比如并行查詢，并行DML）沒有關系。
db file sequential read:官網解釋：This event signifies that the user process is reading a buffer into the
db file parallel read官網解釋： This happens during recovery. It can also happen d
buffer busy waits （熱塊兒爭用）官網解釋： This wait indicates that there are some buffer
