標籤:oracle 等待事件之 buffer busy waitsbuffer busy waits (熱塊兒爭用)官網解釋: This wait indicates that there are some buffers in the buffer cache that multiple processes are attempting to access concurrently. Query V$WAITSTAT for the wait
標籤:oracle 等待事件之 db file scattered readdb file scattered read官網解釋:This event signifies that the user process is reading buffers into the SGA buffer cache and is waiting for a physical I/O call to return. A db file scattered read issues a scattered
標籤:oracle 等待事件之 db file sequential readdb file sequential read:官網解釋:This event signifies that the user process is reading a buffer into the SGA buffer cache and is waiting for a physical I/O call to return. A sequential read is a single-block
標籤:oracle 等待事件之 db file parallel readdb file parallel read官網解釋: This happens during recovery. It can also happen during buffer prefetching, as an optimization (rather than performing multiple single-block reads). Database