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Is it possible to GROUP BY multiple columns using MySQL?
...red Dec 3 '09 at 17:14
Joe PhillipsJoe Phillips
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Do I need to heartbeat to keep a TCP connection open?
I have two components that that communicate via TCP/IP. Component A acts as a server/listener and Component B is the client. The two should communicate as quickly as possible. There can only ever be one connection at any time (though that is aside to this question). A senior developer at my comp...
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...可以控制接收窗口的大小：
shell> sysctl -a | grep mem
net.ipv4.tcp_rmem = <MIN> <DEFAULT> <MAX>
如果我们出于传输性能的考虑，设置了一个足够大的缓冲，那么当大量请求同时到达时，内存会不会爆掉？通常不会，因为Linux本身有一个缓冲...
Fastest Way to Serve a File Using PHP
...f_symlink);
Obviously you'll need a way to prune them either when the script to create them is called or via cron (on the machine if you have access or via some webcron service otherwise)
Under apache you need to be able to enable FollowSymLinks in a .htaccess or in the apache config.
Access con...
【HarmonyOS】真机测试ble - HarmonyOS NEXT - 清泛IT社区，为创新赋能！
...;begin[1]: (define-event) len=8
[2:01:15 PM] [YAIL] 注册事件: 列表显示框1.AfterPicking
[2:01:15 PM] ★ 注册事件: 列表显示框1.AfterPicking
[2:01:15 PM] → 结果:
[2:01:15 PM] 组件数: 9
[2:01:15 PM] 同步 Form 属性: Title=BLE硬件控制demo TitleVisible=true...
Downloading MySQL dump from command line
...backup.sql
You can even go as far as auto-compressing the output using gzip (if your DB is very big):
$ mysqldump -u [uname] -p db_name | gzip > db_backup.sql.gz
If you want to do this remotely and you have the access to the server in question, then the following would work (presuming the...
performing HTTP requests with cURL (using PROXY)
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@BipinVayalu, what do you want to check? At this way, what I describe above, the client uses the proxy "direct way", not transparently. So, the proxy gives the standard HTTP answers (including HTTP codes). If you export a wrong...
How do I purge a linux mail box with huge number of emails? [closed]
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It is not a good praxis data manipulation from outside an application. If there is an option or command that can do the job, it is better to use it. As @timaschew answered, you can use the ‘d’ command inside the mail tool.
– pocjoc...
How to execute mongo commands through shell scripts?
I want to execute mongo commands in shell script, e.g. in a script test.sh :
22 Answers
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Trying to SSH into an Amazon Ec2 instance - permission error
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This command + ssh -i YOUR_PEM_FILE.pem ec2-user@YOUR_IP fixed the issue. Maybe this should be the accepted answer...
– c4k
Apr 24 '14 at 18:07
add a comm...