本文中的数据库实例这一称谓应该换做数据库更为准确，数据库可以理解为是一个物理的静态概念，主要包括一些物理存在的数据库文件，而数据库实例则是一个动态概念，包括一些内存区域以及若干进程，数据库实例是对数据库进行操作的执行者-This database instance for this title should do more accurate database, the database can be understood as a static concept of the physical, including some of the physical database file exists, the database instance is a dynamic concept, including some of the memory areas and number of processes, the database instance is a database operation is performed by