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