Getting Started 13 linux lab manual database Series 2

1. centos7 execute mysql client command such mistakes: of Can not Connect to local MySQL Server through socket '/var/lib/mysql/mysql.sock' (2)
   mysql.sock is in general not in /tmp/mysql.sock /var/lib/mysql/mysql.sock there
   is no word to use ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
   or ln -s /tmp/mysql.sock / var / lib / mysql / mysql.sock
2. CentOS 7: CD-ROM directly mariadb-server client server MariaDB package kits
   installed when the package server, the client will automatically bring
3. Ways to completely uninstall the mysql:
   View is installed: yum install mysql * List
   RPM -qa | grep -i mysql
   uninstall package:
   yum the Remove Server mysql mysql mysql-libs-compat-mysql51
   yum the Remove-mysql-Community Community Release
   continue to delete the installation directory profiles and the like, refer to: https://blog.csdn.net/zhwyj1019/article/details/80274269
   
4. This error master-master replication occurs: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file
   solution: stop slave; reset slave; start slave; ( pro-test success)
   
5. Master-master replication conflicts error Solution: stop slave; set global sql_slave_skip_counter = 1; start slave;
   
6. Skip main event from the copy: skip setting variables from the server, set global sql_slave_skip_counter = N can also be right! !
   Or: slave-skip-error = Error number
7. log_slave_updates
   cascaded set, so the relay binary log write log, the log is then transferred to the next stage from the relay node
8. Refresh permissions: flush privileges;
   MySQL> UPDATE the mysql.user the SET password = PASSWORD ( 'password') the WHERE clause;
   this approach requires the following commands to take effect to be tested?
   MySQL> FLUSH PRIVILEGES;
9. Filters:
   1, the master server DB provided the binlog-do-the binlog the ignore-DB-
   2, and the like from a server provided replicate_do_db replicate_ignore_db
10. rpm -qf /etc/my.cnf
    this file from centos comes with its own library, though they do not install mariadb