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It's really hard to find out if a table in an instance has access.( A common method is to open a tcpdump or tshark persistent packet to filter suspected table names.( However, if we were using MySQL from the Percona branch, this would be much easier. Under Percona MySQL, we can open the userstat parameter and query the system statistics tabl ...

0. Read and write data (1) Read txt file #Read txt and splice data import pandas as pd data=pd.read_table('1.txt', delimiter=',',dtype={'id':'int32','index':'int8'}) all=data.merge(data2,on='id',how='left').merge(data3,on=['id','index'],how='left') (2) Read and save list file Note: if the list i ...

Chapter 15 planning tasks (crontab) 15.2 what is a planned task Remind regularly or when the conditions are met. 15.1.1 types of Linux planned tasks: at, cron Routine: matters to be done at regular intervals; Unexpected: not after this time Types of planned tasks: At: can handle commands that ...

du command Function Description: display the size of file or directory The du command displays the size of the disk space occupied by the specified directory or file, without any options. The default unit is 1KB. Usage: Du [option] [file] option option explain -a Recursively display the disk space occupied by each file and subdirecto ...

1, Django cache Description: In the dynamic website, the data of the website visited by users changes in real time according to the content of the database. In this way, there will be a problem: frequent refresh of the client will affect the performance of the server's database. Using the cache, you can put some data that does not need to be r ...

With the popularity of electronic payment, red envelopes are very popular in social software such as wechat nails. Generally, the amount of red envelopes does not need to be very large, which can achieve the way to improve everyone's enthusiasm. In fact, robbing red envelopes is more of a pastime. It's a joy that can't be imagined. As our tra ...

1. Compile sip source code Unzip the sip source and run PythonConfigure.py-p win32-g++ (win32-g++ means using the mingw32 compiler). Modify generatedSipconfig.pyFile.When Python is installed in the C:\Program Files (x86) directory, place _Pkg_Program Files (x86) in config was replaced with Progra~2, as follows: _pkg_config = { 'arch': ...

Can Linux system have lsmod to enumerate all kernel modules? Isn't procfs fragrant? Why bother enumerating from / dev/kmem? In fact, Linux is a later thing. In the initial UNIX era, enumeration processes such as ps were scanned from / dev/kmem, which is all files Later, the Linux kernel expanded procfs inappropriately, and put all kinds of mes ...

In the previous article, the redis based list implemented a simple message queue: Play redis simple message queue Source address Using demo Product manager often said that we should not only have X function, but also Y function, so that customers can be more satisfied. Similarly, it is not enough to have a simple message queue, and a del ...

add by zhj: Unix Domain Socket is the optimization of network socket, which is applicable to the situation that the server and the client are on the same machine. Compared with network socket, it can improve communication efficiency Original text: https://www.jianshu.com/p/dc78b7ca006a Author: Meopas 0 μ 0 Source: Jianshu Recently, when ...