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Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 更多技术 - 清泛网 - ...
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a、先创建一个数据库，这个数据库必须是没有表和任何操作的。
b、创建一个表结构，和要恢复的表名是一样的。表里的字段无所谓。一定要是innodb引擎的。CREATE TABLE `weibo_qq0`( `weiboid` bigint(20)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
c、...
Slow Requests on Local Flask Server
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Ok I figured it out. It appears to be an issue with Werkzeug and os's that support ipv6.
From the Werkzeug site http://werkzeug.pocoo.org/docs/serving/:
On operating systems that support ipv6 and have it configured such as modern Linux systems, OS X 10.4 or higher as well as Windows V...
使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...常好的效果。
MongoDB拥有灵活的文档型数据结构和方便的操作语法，在新兴的互联网应用中得到了广泛的部署，但对于其底层的存储引擎，我一直有一些保留意 见。据我了解，其采用了MMAP的方式来操作数据文件，这就导致我们...
/data/user/0/xxxx/files（内部存储）和 /storage/emulated/0/Android/data...
...xxx/files外部存储（如模拟的 SD 卡）
内部存储：始终位于系统分区，与应用绑定，用户无法直接通过文件管理器访问（需 Root）。外部存储：位于用户可见的存储空间（如 /sdcard/），路径可能因设备而异（如部分设备显示为 /mnt/s...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...leChannel.transferFrom(). The key advantage here is that the JVM uses the OS's access to DMA (Direct Memory Access), if present. (This is implementation dependent, but modern Sun and IBM versions on general purpose CPUs are good to go.) What happens is the data goes straight to/from disc, to the b...
How to write a large buffer into a binary file in C++, fast?
... fwrite(a, 1, size*sizeof(unsigned long long), pFile);
}
fclose(pFile);
return 0;
}
I just timed 8GB in 36sec, which is about 220MB/s and I think that maxes out my SSD. Also worth to note, the code in the question used one core 100%, whereas this code only uses 2-5%.
Thanks a l...
Format a Go string without printing?
...te: you may also display the result of a template execution if you provide os.Stdout as the target (which also implements io.Writer):
t := template.Must(template.New("email").Parse(emailTmpl))
if err := t.Execute(os.Stdout, data); err != nil {
panic(err)
}
This will write the result directly ...
Is JavaScript guaranteed to be single-threaded?
...e question of whether browsers really implement their JS engines using one OS-thread, or whether other limited threads-of-execution are introduced by WebWorkers.)
However, in reality this isn't quite true, in sneaky nasty ways.
The most common case is immediate events. Browsers will fire these rig...
Change IPython/Jupyter notebook working directory
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Confirmed this does work on Mac OSX, for jupyterlab 0.31.5 / IPython 6.2.1
– Brad Solomon
Feb 11 '18 at 16:48
9
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C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
...132559.htm
所谓的段错误 就是指访问的内存超出了系统所给这个程序的内存空间，通常这个值是由gdtr来保存的，他是一个48位的寄存器，其中的32位是保存由它指向的gdt表， 后13位保存相应于gdt的下标，最后3位包括了程序...