
Oracle 等待事件之 buffer busy waits
buffer busy waits (热块儿争用) 官网解释: This wait indicates that there are some buffers in the buffer ca...
buffer busy waits (热块儿争用) 官网解释: This wait indicates that there are some buffers in the buffer ca...
db file parallel read 官网解释: This happens during recovery. It can also happen during buffer prefe...
db file sequential read: 官网解释: This event signifies that the user process is reading a buffer into the SGA buffer cache ...
Oracle Study之–Oracle等待事件(3) Db file parallel read这是一个很容易引起误导的等待事件,实际上这个等待事件和并行操作(比如并行查询,并行DML)没有关系。 这个事件发生在数据库恢复的时...
free buffer waits 官网解释: This wait event indicates that a server process was unable to find a fre...
Oracle Study之–Oracle等待事件(2) Control file parallel write当数据库中有多个控制文件的拷贝时,Oracle 需要保证信息同步地写到各个控制文件当中,这是一个并行的物理操作过程,因...
Oracle Study之–Oracle等待事件(7) Free buffer waits 当一个会话将数据块从磁盘读到内存中时,它需要到内存中找到空闲的内存空间来存放这些数据块,当内存中没...
db file scattered read 官网解释: This event signifies that the user process is reading buffers into the SGA buffer cache and...