Uninstall the MARIADB database on Centos7, install MySQL

(1) List all installed RPM package

# Rpm-qa | grep mariadbmariadb-libs-5.5.50-1.el7_2.x86_64mariadb-5.5.50-1.el7_2.x86_64mariadb-server-5.5.50-1.el7_2.x86_64

(2) Uninstall

# RPM-E Mariadb-libs-5.5.50-1.el7_2.x86_64

Error at this time:

error: failed dependencies:    libmysqlclient.so.18 () (64bit)  is needed  by  (installed)  postfix-2:2.10.1-6.el7.x86_64    libmysqlclient.so.18 () ( 64bit)  is needed by  (installed)  perl-DBD-MySQL-4.023-5.el7.x86_64     libmysqlclient.so.18 () (64bit)  is needed by  (installed)   php-mysql-5.4.16-36.3.el7_2.x86_64    libmysqlclient.so.18 (libmysqlclient_18) (64bit)   is needed by  (installed)  postfix-2:2.10.1-6.el7.x86_64     libmysqlclient.so.18 (libmysqlclient_18) (64bit)  is needed by  (installed)   perl-dbd-mysql-4.023-5.el7.x86_64    libmysqlclient.so.18 (libmysqlclient_18) (64bit)   is needed by  (installed)  php-mysql-5.4.16-36.3.el7_2.x86_64     Mariadb-libs (x86-64)  = 1:5.5.50-1.EL7_2 IS NEEDED&NBsp;by  (installed)  mariadb-1:5.5.50-1.el7_2.x86_64    mariadb-libs (x86-64)  =  1:5.5.50-1.el7_2 is needed by  (installed)  mariadb-server-1:5.5.50-1.el7_2.x86_ 64

(3) Forced unloading, because there is no –nodeps

# rpm-e--nodeps mariadb-libs-5.5.50-1.el7_2.x86_64# rpm-e--nodeps mariadb-5.5.50-1.el7_2.x86_64# rpm-e--nodeps Maria Db-server-5.5.50-1.el7_2.x86_64

(4) You can then install MySQL.

Uninstall the MARIADB database on Centos7, install MySQL