db file sequential read
1.这个事件出现的情况需要的信息不在SGA中,需要从磁盘中读取db_file_multiblock_read_count参数值为1(这个是不是依然是db file scatt read,只不过这个p3的值应该是1)(需要验证)extent边界,在一个extent中要读...
IO等待时间db file sequential read
今天看到http://www.itpub.net/viewthread.php?tid=936915&extra=&page=1,觉得相当不错,摘录如下: --------请教:关于db file sequential read 等待的问题现在我创建了一个表,该表无索引,当对这个表做全表扫描...
日志产生的过程
1.牛人的关于日志的文章(http://www.ixora.com.au/notes/redo_latching.htm)第一步:获取闩The redo copy latches are used to indicate that a process is copying redo into the log buffer,and that LGWR should...
常见事件
1.log buffer space The log buffer space Oracle metric indicates that the process is waiting for space to become available in the log buffer (Space becomes availabl...