poll多路复用 poll的机制与select类似，与select在本质上没有多大差别，管理多个描述符也是进行轮询，根据描述符的状态进行处理，但是poll没有最大文件描述符数量的限制。 poll和select同样存在一个缺点就是，包含大量文件描述符的数组被整体复制于用户态和内核的地址空间之间，而不论这些文件描述符是否就绪，它的开销随着文件描述符数量的增加而线性增大。 poll编程模型 ...

文章 2016-04-26 来自：开发者社区

专用服务器模式&共享服务器模式

连接ORACLE服务器一般有两种方式：专用服务器连接（dedicated server）和共享服务器连接（shared server）。那么两者有啥区别和不同呢？下面我们将对这两者的区别与不同一一剖析。专用服务器模式（dedicated server）模式在专用服务器模式中，用...

文章 2016-04-15 来自：开发者社区

MySQL服务器可以以不同的SQL模式来操作，并且可以为不同客户端应用不同模式。这样每个应用程序可以根据自己的需求来定制服务器的操作模式。模式定义MySQL应支持哪些SQL语法，以及应执行哪种数据验证检查。这样可以更容易地在不同的环境中使用MySQL，并结合其它数据库服务器使用MySQL。 1 可以用--sql-mode="modes"选项启动mysqld来设置默认SQL模式。如果你想要重设....

文章 2016-01-13 来自：开发者社区

oracle共享服务器模式

oracle 响应客户端请求有两种方式： 1 专有连接：用一个服务器进程响应一个客户端请求 2 共享连接：用一个分派器(dispatcher)响应一个客户端请求，服务器端有多个服务器进程，共享处理所有分派器的请求；两种连接方式的优缺点 1 对于连接数不多的应用，适宜用专有连接，客户的请求响应及时； 2 对于连接数较大的应用，适宜用共享连接，充分利用系统资源后台作业和RMAN操作必...

问答 2015-10-31 来自：开发者社区

气象数值模式在阿里云服务器是否可行？

气象数值模式对计算资源要求比较高，我们小研究生搞搞科研的服务器一般也需要8G内存，2T硬盘。假如在阿里云上，一个月的费用要1000多块，的确有点多。

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