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Guidance: Author: Wei Xinping, a student in the 5th MySQL battle class of Zhishutang and a student in the 10th MySQL optimization class, is currently a teaching assistant. 1. Official Interpretation The maximum number of file descriptors the mysqld process can use, and the actual value of mysql will be the largest of the following four values ...

Because of the content of the work, we often need some python scripts. Over time, we found that some methods are often used, so we edited some common, popular and general methods by ourselves. I'm not talented, but I also hope to contribute to open source. Finally, code HA is attached; 1, At present, only five methods are summarized in this do ...

IO, often collaborative I/O, is the abbreviation of Input/Output, that is, Input/Output. At present, there are three types of IO coexisting. They are BIO, NIO and AIO. Before we get to know IO, let's look at the concepts. Related concepts Flow oriented and buffer oriented The first big difference between Java IO and NIO is that IO is strea ...

1. View file properties: ls -l filename - rw-rw-r-- 1 kiosk kiosk 0 Oct 2 17:05 file [1] [2] [3] [4] [5] [6] [7] [8] //notes: [1]file type - # Common documents d # catalog s # Socket socket, the open interface of a progra ...

The usage of select in network programming select use flow chart Lines of code to be added in network programming and their significance routine References and blogs Note: This paper does not explain the select function, related parameters and structure select use flow chart Create with Rapha ë l 2.2.0 define select ...

Implement multiple instances based on yum source This experiment implements three examples, using port 330633073308 respectively 1. Install MariaDB server, yum #yum install mariadb-server 2. Create a directory for each instance #mkdir  /data/mysql/{3306,3307,3308}/{etc,data,socket,log,bin,pid} -pv 3. Permission to modify ...

Preparation environment: centos7 install Yum install MariaDB server Plan and implement the directory structure of multiple instances Port: 33063307, 3308 The folder where each instance stores the database / data / MySQL {330633073308} /data/mysql/3306/{etc,soket,log,data,pid,bin} Create the data folder required by mysql u ...

In short: The tcp connection used by Socket needs to be connected before sending data. For the UDP connection used by datagram socket, the client does not need to connect the data first and can send it directly to the specified server. DatagramSocket: Client send (send data directly, no connection process): protected void ...

brief introduction After dubbo service is released, we can use telnet command to debug and manage. For more information, see Telnet Command Reference Manual telnet call example: $ telnet 172.17.103.110 9097 Trying 172.17.103.110... Connected to 172.17.103.110. Escape character is '^]'. dubbo>ls com.oppo.sso.service.onekey.IOne ...

Netty sticking and unpacking 1. What is unpacking and sticking (1) introduction to unpacking and sticking TCP is a "flow" protocol. The so-called flow is a string of data without boundary. You can think of the running water in the river, which is connected in one piece, and there is no boundary between them. The bottom layer of TCP d ...