摘要：
一、SGA(system global area )SGA可以认为是instance中的全局共享区，Instance是由SGA和processes（进程）组成。官方文档中的解释： A system global area (SGA)(系统全局区) is a group of shared memory structures that containdata and control information for one Oracle database instance(实例). If multiple users areconcurrently connected to the same in 阅读全文