ORACLE 中几个难以理解的概念说明
latch 闩锁，表示oracle数据库运行进程之间在处理一些数据的时候发生的锁定机制。lock 锁，表示oracle数据库中具体对象之间发生并发的时候，
latch 闩锁，，表示Oracle数据库运行进程之间在处理一些数据的时候发生的锁定机制。
lock 锁，表示oracle数据库中具体对象之间发生并发的时候，差生的锁定机制，一般包括表锁定，记录锁定等等
逻辑I/O 表示在数据从缓存中读取的过程中发生的读取和写入操作。只计算在内存中数据处理的时候。
物理I/O 表示数据从磁盘或磁带等设备中读取，写入的操作。例如重做日志文件的读写，数据文件的读写，脏数据从高速缓存写入到数据文件中等等。
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