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Difference between float and decimal data type
...s are required of the DB engine to convert the "number" into something the CPU recognizes as a number. No rounding, no conversion errors, it's a real number the CPU can manipulate.
Calculations on this arbitrarily large integer must be done in software, as there is no hardware support for this kin...
What are the differences between virtual memory and physical memory?
...ly, transcendentally slower. It is an I/O operation, which means it is not CPU bound (it is rather the exact opposite), which means it does not need to occupy RAM right now. However, it still occupies RAM stubbornly. If you want to launch Firefox in the meantime, you can't, because there is not much...
那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...弱点，真是人生的一大考验。有些人采取鸵鸟政策，假装问题不存在；有些人一看苗头不对就转移，避开心虚；还有些人打肿脸充胖子，掩盖心虚。总之，都是在躲，都是不健康的应对。
真正健康的方式是什么？是努力戒除情...
How do you determine the ideal buffer size when using FileInputStream?
...mum buffer size is related to a number of things: file system block size, CPU cache size and cache latency.
Most file systems are configured to use block sizes of 4096 or 8192. In theory, if you configure your buffer size so you are reading a few bytes more than the disk block, the operations wit...
Win32 创建控件风格不是Win XP的解决方案 - C/C++ - 清泛网 - 专注C/C++及内核技术
...="x86"，如果这个应用程序想在x64下面运行，就会导致一个问题：这个64位的程序链接的是32位的comctl32库，创建控件就会失败。所以最好的解决方案就是下面这种做法：
在头文件里面加入下面的语句：
#ifdef _UNICODE
#if defined _M_I...
裁员！裁员！创业者们的2016“寒冬大逃杀” - 资讯 - 清泛网 - 专注IT技能提升
...候，“什么时候盈利”忽然成了几乎每个投资人都会问的问题，但在之前的三轮融资都没有人提过。当时大家关心的都是订单量、GMV和增速。
“无论公司当下有没有收入，从财务模型上看，都是要在收敛的、亏损是在变小的。...
This app won't run unless you update Google Play Services (via Bazaar)
...alled these on an emulator configured with platform: 4.1.2, API Level: 16, CPU Intel/Atom x86) and my Google Maps V2 application works again.
That was all .. none of the other steps regarding /system/app were required.
My application only uses the Google Maps API, no doubt, more steps are required...
What is a coroutine?
...t? If it is right, it is just like an un-preemptive OS running on one-core CPU, one process must relinquish CPU to let other tasks run.
– Nan Xiao
Jun 22 '16 at 12:18
...
Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...$ echo $ORACLE_SID
空的
查看环境变量
vi .bash_profile 没有问题
查看权限
ll .bash_profile
-rw--rw--- 1 oracle oinstall 529 10鏈?24 20:18 /home/oracle/.bash_profile
有问题。修改权限
chmod 775 /home/oracle/.bash_profile
进入ORLACE
sqlplus /as sysd...
Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 爬虫/数据库 - 清...
...需要注释掉，不然恢复模式不好操作。 这里有个关键的问题，就是innodb里的任何数据操作都是一个日志的记录点。也就是如果我们需要数据恢复，必须把之前的表的数据的日志记录点添加到一致。
a、建立一个数据库，根据上...