《云计算架构技术与实践》连载21：2.4.6数据库云
2.4.6 数据库云 基于云计算总体架构下的数据库云解决方案，如图2-34所示。 图2-34 数据库云解决方案架构子系统组合 数据库云主要指的是基于云平台构建的结构化/半结构化数据库处理系统。 数据库云可以基于虚拟化平台，也可以基于物理平台直接构建。 在性能要
2.4.6 数据库云
基于云计算总体架构下的数据库云解决方案，如图2-34所示。
图2-34 数据库云解决方案架构子系统组合
数据库云主要指的是基于云平台构建的结构化/半结构化数据库处理系统。
数据库云可以基于虚拟化平台，也可以基于物理平台直接构建。
在性能要求高的场景下，一般基于物理平台构建，系统无需弹性计算部分（图中虚线表现）；而在要求容量很大，应用用户很多的情况下，则可采用基于虚拟化平台构建的形式。
数据库云一般以数据库一体机的形态出现，会在以下方面做些增强：
l 数据库加速：为取得更好的数据库性能，会在硬件层、弹性存储层做垂直层面的深入调优，例如采用读写更快的SSD卡，采用面向数据库独特的读写算法；
l 数据库加固：为保证数据库数据不丢失、不损坏，会在中间件服务层增加数据库的备份/恢复、容灾、定期校验等服务，提高数据的可用性。
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