概念

　　Proxifier是一款功能非常强大的socks5客户端，可以让不支持通过代理服务器工作的网络程序能通过HTTPS或SOCKS代理或代理链。支持 64位系统，支持Xp，Vista，Win7，支持socks4，socks5，http代理协议，支持TCP，UDP协议，可以指定端口，指定IP，指定程序等运行模式，兼容性非常好。有点类似SOCKSCAP。

还在使用Windows自带的mstsc吗？还在为切换多个远程桌面而痛苦不已吗？想不想换个远程桌面程序呢？如果您的答案是Yes，那么我向您推荐mRemote。至今为止，我用过的最好的远程桌面工具。

Looking at how people are using COUNT(*) and COUNT(col) it looks like most of them think they are synonyms and just using what they happen to like, while there is substantial difference in performance and even query result.

Problem(Abstract)

Connections to Informix Dynamic Server (IDS) hang or take a long time to connect. Other users who are already connected do not see a performance problem. Once a user is connected there is no performance problem.

Symptom

Problem(Abstract)

Client applications using the TCP/IP protocol to connect to Informix experience poor performance during connection. Once the connection has been established the performance is improved.

影响 CPU 利用率的 UNIX 配置参数之UNIX 文件描述符参数

NFILES = (chunks * NUMAIOVPS) + NUMCPUVPS + net_connections

出处：Unix文件描述符参数

今天，数据库的操作越来越成为整个应用的性能瓶颈了，这点对于Web应用尤其明显。关于数据库的性能，这并不只是DBA才需要担心的事，而这更是我们程序员需要去关注的事情。当我们去设计数据库表结构，对操作数据库时（尤其是查表时的SQL语句），我们都需要注意数据操作的性能。这里，我们不会讲过多的SQL语句的优化，而只是针对MySQL这一Web应用最多的数据库。希望下面的这些优化技巧对你有用。

To set up IBM-Informix Storage Manager (ISM) to run on UNIX follow these steps:

1.Log in as informix to the machine where your engine is installed. Set up your environment to use the engine.

2. Create a directory in which to store the savesets for logical log backup. This step is only needed if you want to be able to save storage spaces or logical logs to files.