1.MySQL 特点 MySQL 数据库是 Sun 公司开发、发布和支持的一个关系数据库管理系统,是世界上最 流行的开放源代码数据库之一。MySQL 作为一种服务器后台数据库,由于具有丰富的应用 编程接口且功能强大、灵活多变,受到了广大个人用户和许多大型公司机构的青睐,如雅虎、 阿尔卡特-朗讯、Google 公司、诺基亚公司、百度等公司就采用了 MySQL 数据库
❖Why need memory management ❖Memory partitioning ❖Paging ❖Segmentation 3.1 Memory Management Requirements ♣ Relocation(重定位) ♣ Memory Protection(保护) ♣ Memory Sharing(共享) ♣ Logical Organization(逻辑组织) ♣ Physical Organization(物理组织) 3.2 Memory Partitioning • Fixed Partitioning • Dynamic Partitioning • Buddy System(伙伴系统) 3.3 Simple Paging Technique ❖ A process can be loaded into several not continuous frames(页帧). ❖ The efficiency of main memory is higher 3.4 Simple Segmentation Technique • A program and its associated data are divided into a number of segments. The segments may be not the same length. Main memory is divided into many partitions 3.5 Virtual Memory 虚拟存储