查看当前安装的java
rpm -qa | grep java搜索openjdk版本
yum search java-11-openjdk安装openjdk11
yum install java-11-openjdk        查看当前安装的java
rpm -qa | grep java搜索openjdk版本
yum search java-11-openjdk安装openjdk11
yum install java-11-openjdk        参考之前的文章 Centos7 安装 mongodb
curl -sL https://rpm.nodesource.com/setup_10.x | bash -
yum install nodejsvi /etc/yum.repos.d/elasticsearch.repo填入以下内容
[elasticsearch]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=0
autorefresh=1
type=rpm-md查看查询日志开启状态信息
SHOW VARIABLES LIKE "general_log%";开启查询日志
SET GLOBAL general_log='ON';指定查询日志存储路径
SET GLOBAL general_log_file='/var/log/mysql/general_log.log';查看慢查询日志开启状态信息