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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...前几篇文章。
任意登陆一个机器，比如登陆192.168.0.136，连接mongodb
#设置第一个分片副本集
/data/mongodbtest/mongodb-linux-x86_64-2.4.8/bin/mongo 127.0.0.1:22001
#使用admin数据库
use admin
#定义副本集配置
config = { _id:"shard1", members:[
...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...外，服务请求时所做的工作可能需要其它资源，例如 JDBC 连接、套接字或文件。这些也都是有限资源，有太多的并发请求也可能引起失效，例如不能分配 JDBC 连接。
并发错误
线程池和其它排队机制依靠使用 wait() 和 notify() 方...
SQL JOIN - WHERE clause vs. ON clause
...
@JamesHutchison It's tough to make reliable performance generalizations based on observed behaviors like this. What was true one day tends to be wrong the next, because this is an implementation detail rather than documented behavior. Database teams are always look...
How to check for an active Internet connection on iOS or macOS?
...y via closures
let reachability = Reachability()!
reachability.whenReachable = { reachability in
if reachability.connection == .wifi {
print("Reachable via WiFi")
} else {
print("Reachable via Cellular")
}
}
reachability.whenUnreachable = { _ in
print("Not reachabl...
How to iterate through a DataTable
I need to iterate through a DataTable . I have an column there named ImagePath .
4 Answers
...
Easiest way to detect Internet connection on iOS?
...through HTTPUrlConnection instantly fail if there is no connection available. This seems like completely sane behavior, and I was surprised to find NSURLConnection in iOS did not emulate it.
...
iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
...5.0系统），并点VMware右下角的，USB图标，确定和主机断开连接（就是和Win7断开，和虚拟机连接），之后，运行一次XCode，因为是第一次插入此设备，XCode会启动Orgnizer，来识别你的iPhone，又因为是越狱机器，会提示该系统无法识...
How to use android emulator for testing bluetooth application?
...er settings of the virtual machine, Goto serialports -> Port 1 check Enable serial port select a port number
then select port mode as disconnected click ok. now, start virtual
machine. Under Devices -> USB Devices -> you can find your laptop
bluetooth listed. You can simply check t...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...ul response and serve it to
subsequent clients even when clients may be able to make a successful
request.
I'll leave it to you to decide between 4xx and 5xx, but you should use an error status code.
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App Inventor 2 中文网 · 项目指南
... 5000 + 次 连接测试 20000 + 次 累计在线时长 50000 + 时 文档翻译进...