Linux Experiment 1 Common Commands and Shell Programming for Linux

Experiment 1 Linux Common Commands and Shell Programming I. Experimental Contents 1. Exercise a) When running the program on the command line, the Linux system searches a series of directories in the $PATH variable to find the corresponding files, writes a script to output all executable files in th ...

Posted on Sun, 04 Aug 2019 00:54:53 -0700 by importune

Introduction to egg.js

Links to the original text: https://www.cnblogs.com/rope/p/10859014.html What is Egg? Egg.js is an enterprise-level framework and application. It is hoped that Egg.js will breed more upper-level frameworks to help development teams and dev ...

Posted on Sat, 03 Aug 2019 03:58:01 -0700 by Residue

What is the ghost of MySQL binlog failing to recover data based on time?

Problem phenomena A customer feedback, when using binlog to do point-based recovery, often fails to correctly restore data (the probability is about 5%~10%). The database environment provides MySQL 5.7.27 version of cascade replication topology (A->B->C), main library A provides write ...

Posted on Thu, 01 Aug 2019 20:37:55 -0700 by dougp23

Linux Installation of MySQL and Basic Operations

In order to provide more abundant and powerful web application functions, it often needs the support of background database, web programming and other roles. In general small and medium-sized enterprises, the most commonly used database is MySQL. MySQL is a truly multi-threaded, multi-user SQL database ...

Posted on Thu, 01 Aug 2019 20:21:38 -0700 by blyz

ansible's playbook uses, judges, loops, and roles

ansible 3rd playbook Conditional Judgment, Cycle and roles Hierarchical Management 1. ansible playbook's judgment, cyclic syntax: In ansible playbook, when syntax can be used to make judgments and loops through with_items, with the following examples: --- vim httpd_v4.yaml - hosts: websrvs remote_user: '{{uservar}}' vars: ...

Posted on Wed, 31 Jul 2019 16:12:16 -0700 by abolmeer

EMQ X rule engine series stores messages to MySQL database

Scenario introduction This scenario requires storing qualified messages under EMQ X specified topics into the MySQL database. In order to facilitate subsequent analysis and retrieval, message content needs to be split and stored. In this scenario, the device side reports the following information: Subject: cmd/state/:id, in which ID represents ...

Posted on Wed, 31 Jul 2019 04:50:41 -0700 by Drace

Java web login registration interface introductory tutorial

Preface: The blogger is a self-taught Java, but even the basic knowledge of "Java from Initial to Proficient" has not been read. Because of the need of internship, it is necessary to develop a simple login and registration interface with JavaEE (J2E). Through powerful search engine and num ...

Posted on Mon, 29 Jul 2019 02:25:58 -0700 by cordoprod

mysql log system inventory

MySql log files include error log, slow query log, transaction log, binary log, etc. Mysql logs can be configured by command 1 show global variables like '%log%'; The results of implementation are as follows "back_log" "80" "binlog_cache_size" "32768" "binlog_checksum" "CRC32" "binlog_direct_non_transactional_updates" ...

Posted on Sun, 28 Jul 2019 05:40:09 -0700 by scuzzo84

01 MySQL Complete Notes

MySQL I. Services System: services.mcs net start mysql open service net stop mysql closes the service mysql -uroot -p(pwd) -h127.0.0.1 3306 -P Link locality is abbreviated as: mysql-uroot-p passwd: hch II. Basic Operation 1. Operating folders or libraries: (The name of the repository cannot ...

Posted on Sat, 27 Jul 2019 23:29:40 -0700 by kimbeejo

Foundation Dynamic Planning

- Restore content to start Dynamic Programming Dynamic Programming Methodology _The essence of a computer is a state machine. All the data stored in memory constitute the current state. CPU can only calculate the next state by using the current state (don't tangle with external storage such as hard disk, even if they consider that they just exp ...

Posted on Sat, 27 Jul 2019 07:49:15 -0700 by algarve4me