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公开课1152:SQL服务器群集

2016-11-21 18:15| 投稿: lofor| 查看: 5680| 评论: 30

摘要: 当今世界是一个信息化的世界,我们的生活中无论是生活、工作、学习都离不开信息系统的支撑。而信息系统的背后用于保存和处理最终结果的地方就是数据库。因此数据库系统就变得尤为重要,这意味着如果数据库如果面临问 ...

当今世界是一个信息化的世界,我们的生活中无论是生活、工作、学习都离不开信息系统的支撑。而信息系统的背后用于保存和处理最终结果的地方就是数据库。因此数据库系统就变得尤为重要,这意味着如果数据库如果面临问题,则意味着整个应用系统也会面临挑战,从而带来严重的损失和后果。

    如今“大数据”这个词已经变得非常流行,虽然这个概念如何落地不得而知。但可以确定的是,随着物联网、移动应用的兴起,数据量相比过去会有几何级的提升,因此数据库所需要解决的问题不再仅仅是记录程序正确的处理结果,还需要解决如下挑战:

  • 当数据库性能遇到问题时,是否能够横向扩展,通过添加服务器的方式达到更高的吞吐量,从而充分利用现有的硬件实现更好的投资回报率。
  • 是否拥有实时同步的副本,当数据库面临灾难时,可以短时间内通过故障转移的方式保证数据库的可用性。此外,当数据丢失或损坏时,能否通过所谓的实时副本(热备)实现数据的零损失。
  • 数据库的横向扩展是否对应用程序透明,如果数据库的横向扩展需要应用程序端进行大量修改,则所带来的后果不仅仅是高昂的开发成本,同时也会带来很多潜在和非潜在的风险。

    面对上述挑战一个显而易见的办法是将多个服务器组成一组集群,这样一来就可以充分利用每一台服务器的资源并将客户端负载分发到不同服务器上,随着应用程序负载的增加,只需要将新的服务器添加到集群即可。


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