如何判断centos中是否安装了mysql？

Question

如何判断centos中是否安装了mysql？ 

Answer 1

如果你是用rpm安装, 检查一下RPM PACKAGE:
rpm -qa | grep -i mysql

检查mysql service:
service mysql status

Answer 2

innodb_data_home_dir = /longxibendi/mysql/mysql/var/
#innodb_data_file_path = ibdata1:1G:autoextend
innodb_data_file_path = ibdata1:500M;ibdata2:2210M:autoextend #表空间
innodb_file_io_threads = 4 #io线程数