关于IIS连接数和在线人数的详细说明_MySQL
IIS
最近有个别客户反映购买的在线人数(IIS连接数)和实际不符合，现在特说明如下
首先了解什么是IIS连接数。
IIS连接数指并发连接数，什么意思呢？
要分几种情况：（以100M空间50人在线为例）
A 用户单点下载你的文件，结束后正常断开，这些连接是按照瞬间计算的，就是说你50人的网站瞬间可以接受同时50个点下载
B 用户打开你的页面，就算停留在页面没有对服务器发出任何请求，那么在用户打开一面以后的15分钟内也都要算一个在线，就是说你50人的网站15分钟内可以接受不同用户打开50个页面
C 上面B的情况用户继续打开同一个网站的其他页面，那么在线人数按照用户最后一次点击（发出请求）以后的15分钟计算，在这个15分钟内不管用户怎么点击（包括新窗口打开）都还是一人在线。
D 当你的页面内存在框架(Iframe)，那么每多一个框架就要多一倍的在线！因为这相当于用户同一时间向服务器请求了多个页面。
E 当用户打开页面然后正常关闭浏览器，用户的在线人数也会马上清除。
然后了解什么是论坛在线人数。
论坛在线只是计算一定时间内的活动用户数。
这里的时间用户可以自己设定(删除不活动用户时间)，动网论坛默认为40分钟的相对准确值。
根据上面的说明，显然论坛在线和IIS连接数的概念不同
为什么会出现IIS连接数和论坛在线不符合的情况？
现具体分析如下：
1：您使用了插件版论坛！
现在的插件很垃圾，不但占服务器资源，而且会使论坛运行变慢（没有插件可以快一倍以上），同时很占在线人数，有的插件调用很多框架，少则2、3个，多则4、5个！ 甚至有在线播放音乐，这样一个人在线就相当与很多人在线！
2：您的网站是主页+论坛的形式！
这样主页和论坛要争夺你的在线人数！
3：你的论坛内部有播放器！
一个人在线，然后他在线播放音乐，就占二个人在线！
4：你的论坛内部存在框架形式的网页！
每一个框架，就多一倍的在线！
5：你的论坛设置在线时间过小！
动网默认为40分钟，这个默认值下，一般我们20IIS的学习型主机可以达到50人左右，因为论坛在线只是计算一定时间内的活动用户数，当您设定的时间较小的时候，看起来论坛在线的人数就自然少了，请把删除不活动用户时间改为默认的40分钟就可以！
6：你的空间存在多个论坛！
有的客户在一个空间里上传多个论坛，如bbs bbs1 bbs2 等等 等等
毫无疑问，这样个论坛也是要争夺再线人数的！
7：你的论坛图片等文件被人盗链！
比如：你的论坛有张图片文件，被粘贴（注意是粘贴不是上传）到别的论坛！
别的论坛的用户在浏览该文件的时候也算一个在线人数！
尤其是LOGO连接的时候注意，一定要对方把您的LOGO上传到他的空间！
8：你的空间上放有下载文件！
如果用户用网络蚂蚁类的软件，每一个线程就表示一个在线，非常厉害！
――――――――――――――――――――――――――――――――――
解决办法：
1：去掉垃圾的插件版，用纯洁版！
2：LOGO连接时，请对方把您的LOGO传到他的空间！
3：尽量不要采用框架的形式制作页面！
4：不要放任何的音乐、电影、下载！
5：防止盗连情况的发生！
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