解决mysql无法随机启动问题的方法（mysql 不会随机启动）
解决mysql无法随机启动问题的方法
MySQL是一个流行的开源关系数据库管理系统，它在业界被广泛应用。在使用MySQL时，有时会碰到无法随机启动的情况，这给用户带来了困扰。接下来，本文将介绍几种解决MySQL无法随机启动问题的方法。
方法一：检查MySQL运行状态
我们需要检查MySQL的运行状态是否正常，若是可以按照以下步骤操作：
1. 打开命令行窗口（Windows系统）或终端（Linux/Mac系统）；
2. 输入命令：
systemctl status mysql
或者
service mysql status
3. 如果MySQL运行状态良好，则输出如下信息：
mysql.service – MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2020-01-28 17:09:22 CST; 9h ago
如果MySQL没有运行或者状态异常，则可以通过以下命令启动或者重启MySQL服务：
systemctl start mysql
或者
service mysql start
方法二：重置MySQL数据目录权限
我们可以尝试重置MySQL数据目录权限。步骤如下：
1. 进入MySQL数据目录，例如：
cd /var/lib/mysql
2. 备份MySQL数据目录中的数据文件和配置文件：
cp -R data data-backup
cp my.cnf my.cnf-backup
3. 重置MySQL数据目录权限：
sudo chown -R mysql:mysql data
4. 重启MySQL服务：
systemctl restart mysql
或者
service mysql restart
方法三：检查MySQL配置文件
我们可以检查MySQL配置文件是否正确。如下：
1. 打开MySQL配置文件：
sudo nano /etc/mysql/my.cnf
2. 检查配置文件中是否有语法错误或者配置错误。如果有错误，可以尝试修改并保存文件，如下所示：
# Example MySQL config file for large systems.
#
# This is for a large system with memory = 512M where the system runs mnly
# MySQL.
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the “–help” option.
#
# The following options will be passed to all MySQL clients
[client]
#password = your_password
port = 3306
socket = /var/run/mysqld/mysqld.sock
#
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer_size = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log = /var/log/mysql/mysql.log
#
# Error log – should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#slow_query_log[={0|1}]
#slow_query_log_file = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI “tinyca”.
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completion
[isamchk]
key_buffer_size = 16M
如果以上方法都不能解决问题，我们可以尝试卸载并重新安装MySQL，在安装过程中完成相关的配置，以实现MySQL正常随机启动运行。
总结
通过以上方法，我们可以轻松地解决MySQL无法随机启动的问题。需要注意的是，在操作前一定要做好备份工作，以免数据丢失。同时，建议我们可以熟悉MySQL的相关基础知识，以便在操作过程中更准确、高效地解决问题。
