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大数据时代的数据化运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...的效果，包括付费渗透率以及UP值低于预期。原来的广告资源都铺开了，只能快速地调试产品和验证产品。当时我们用了一个比较特殊的渠道，我们在7天出了七八个版本，每天一个以上的版本，我们用了一个礼拜的时间，最终才...
String, StringBuffer, and StringBuilder
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ArtefactoArtefacto
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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...能会引发你的各种思考，让你的大脑分配很多内存和计算资源，所以，不适合在厕所中阅读。
TCP的RTT算法
从前面的TCP重传机制我们知道Timeout的设置对于重传非常重要。
设长了，重发就慢，丢了老半天才重发，没有效率，性...
前有网易喂猪，后有宜信养牛 - 资讯 - 清泛网 - 专注C/C++及内核技术
...向整个市场、包括所有竞争对手在内，开放了自己的核心资源：大数据。”吕海燕说，“没有九年坚持不懈的努力，任何一家公司不可能像宜信这样积累海量的数据。我们把数据分享出来，目的就是为了树立行业信心：互联网金...
source of historical stock data [closed]
...ship you a drive with terabytes of data. If I remember right its about $3k-4K per year of data. But trust me, once you understand how hard it is to get good intraday data, you won't think this is very much money at all.
Not to discourage you but to get good data is hard, so hard in fact that many h...
How do malloc() and free() work?
... virtual memory manager can handle (most often multiples of 512 bytes e.g. 4KB).
So returning 40 Bytes to the OS will just not work. So what does free do?
Free will put the memory block in its own free block list. Normally it also tries to meld together adjacent blocks in the address space. The fr...
阿里的线下野心 - 资讯 - 清泛网 - 专注C/C++及内核技术
...泰宣布开启O2O破冰之旅，银泰商业投入线下35个实体店的资源支持天猫“双11”。从当时情况来看，双方的合作停留于浅层次的营销手法上，并没有想象中的“颠覆”感。
但到了2014年，阿里在“双12”期间用移动支付“轰炸”了...
Why is the .bss segment required?
...ny uninitialized buffers 4096 bytes in length. Would you want all of those 4k buffers to contribute to the size of the binary? That would be a lot of wasted space.
– Jeff Mercado
Mar 2 '12 at 15:02
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如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
...没有时间顺序关系、没有执行用户信息，只有执行次数与资源统计。
从dba_hist_sqlstat可以看到AWR snapshot之间的SQL统计信息，与v$sqlstats比不受实例重启的影响，因为实例重启之后v$sqlstats中的信息就清除了。
【方法三：session tra...
What is the difference between localStorage, sessionStorage, session and cookies?
...domain. This gives you considerably more space to work with than a typical 4KB cookie.
The data is not sent back to the server for every HTTP request (HTML, images, JavaScript, CSS, etc) - reducing the amount of traffic between client and server.
The data stored in localStorage persists until explic...