数据库管理系统
今天总结了一下《数据库》，画了两个图，下面就根据我的图，说下学习的知识。 图 1 数据库设计好了就应该开始使用了，这时就应该编制并调试相应的应用程序了，之后进行少部分数据入库，开始数据库的试运行。主要是进行性能和功能的调试。当然维护是必不可少
今天总结了一下《数据库》，画了两个图，下面就根据我的图，说下学习的知识。
图 1
数据库设计好了就应该开始使用了，这时就应该编制并调试相应的应用程序了，之后进行少部分数据入库，开始数据库的试运行。主要是进行性能和功能的调试。当然维护是必不可少的。数据的安全性我们应该都考虑到。
下面说下图2，图2的大角色就是DBS（数据库系统）了，它包括DBA（数据库管理员），DBMS（软件），DB（数据库）。应用程序通过DBMS去接触DB中的数据，然后DB再通过DBMS将查询结果进行处理反馈给应用程序。DBMS中含有DDL的编译程序（定义数据库的三级两层），DML的编译程序或解释程序（增、删、改、查），还有存放三级结构定义的数据字典-DD。DBS运行时，DBMS要对其进行监控。DBS运行的最小逻辑单位是“事务”，对数据库的操作都要以事务为单位来执行或撤销。DBA通过DBMS中的某些程序和DD系统来掌握整个DBS的工作情况。所以DBA的责任是相当重的，需要水平高、资历深的人担任。
这就是我对本书的理解，不足之处还请多多指教！
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