1. 小版本升级
– 5.7.30 -> 5.7.40
– 8.0.30 -> 8.0.36
– 风险低，兼容性好

2. 大版本升级
– 5.7 -> 8.0
– 风险较高，需要充分测试

3. 跨版本升级
– 5.6 -> 8.0
– 风险最高，需要分步升级

1. 查看当前版本
mysql> SELECT VERSION();

输出示例：
+———–+
| VERSION() |
+———–+
| 5.7.30 |
+———–+

2. 使用MySQL Shell检查升级
mysqlsh root@localhost -e “util.checkForServerUpgrade()”

输出示例：
Checking server version…
Running MySQL 5.7.30 – MySQL Community Server (GPL)
Checking for server upgrade issues…
1) Usage of old temporal type
No issues found
2) Usage of db objects with long data type names
No issues found
3) Usage of utf8mb3 charset
No issues found
4) Table names that conflict with reserved keywords in MySQL 8.0
No issues found
5) Usage of foreign keys without indexes
No issues found
…
Errors: 0
Warnings: 0
Notices: 0

1. 全量备份
mysqldump -u root -p –all-databases –single-transaction –flush-logs –master-data=2 > full_backup.sql

输出示例：
— MySQL dump 10.13 Distrib 8.0.36, for Linux (x86_64)
—
— Host: localhost Database:
— ——————————————————
— Server version 8.0.36

2. 备份配置文件
cp /etc/my.cnf /etc/my.cnf.backup

3. 备份数据目录
cp -r /var/lib/mysql /var/lib/mysql.backup

1. 停止MySQL服务
systemctl stop mysqld

2. 备份MySQL安装目录
cp -r /usr/mysql /usr/mysql.backup

3. 卸载旧版本
yum remove mysql-community-server

4. 安装新版本
yum install mysql-community-server-8.0.36

5. 启动MySQL服务
systemctl start mysqld

6. 检查升级状态
mysql_upgrade -u root -p

输出示例：
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.component OK
…
Upgrade process completed successfully.
Checking if update is needed.

1. 导出数据
mysqldump -u root -p –all-databases –single-transaction –flush-logs –master-data=2 > full_backup.sql

2. 停止MySQL服务
systemctl stop mysqld

3. 卸载旧版本
yum remove mysql-community-server

4. 安装新版本
yum install mysql-community-server-8.0.36

5. 启动MySQL服务
systemctl start mysqld

6. 导入数据
mysql -u root -p < full_backup.sql 7. 验证数据 mysql -u root -p -e "SHOW DATABASES;" 输出示例： +--------------------+ |
Database | +——————–+ | information_schema | | mysql | | performance_schema | | sys | | test_db |
+——————–+

1. 在新服务器安装MySQL
yum install mysql-community-server

2. 配置新服务器
vim /etc/my.cnf

3. 停止旧服务器MySQL
systemctl stop mysqld

4. 备份旧服务器数据
mysqldump -u root -p –all-databases –single-transaction –flush-logs –master-data=2 > full_backup.sql

5. 传输备份到新服务器
scp full_backup.sql new-server:/tmp/

6. 在新服务器导入数据
mysql -u root -p < /tmp/full_backup.sql 7. 验证数据 mysql -u root -p -e "SHOW DATABASES;" 输出示例：
+——————–+ | Database | +——————–+ | information_schema | | mysql | |
performance_schema | | sys | | test_db | +——————–+

1. 检查当前版本
mysql> SELECT VERSION();

输出示例：
+———–+
| VERSION() |
+———–+
| 5.7.30 |
+———–+

2. 兼容性检查
mysqlsh root@localhost -e “util.checkForServerUpgrade()”

3. 备份数据
mysqldump -u root -p –all-databases –single-transaction –flush-logs –master-data=2 > full_backup.sql

4. 停止MySQL服务
systemctl stop mysqld

5. 卸载MySQL 5.7
yum remove mysql-community-server

6. 安装MySQL 8.0
yum install mysql-community-server-8.0.36

7. 启动MySQL服务
systemctl start mysqld

8. 运行升级脚本
mysql_upgrade -u root -p

9. 验证升级
mysql> SELECT VERSION();

输出示例：
+———–+
| VERSION() |
+———–+
| 8.0.36 |
+———–+

10. 验证数据
mysql> USE test_db;
mysql> SELECT COUNT(*) FROM users;

输出示例：
+———-+
| COUNT(*) |
+———-+
| 1000 |
+———-+

1. 在Linux服务器导出数据
mysqldump -u root -p –all-databases –single-transaction –flush-logs –master-data=2 > full_backup.sql

2. 传输备份到Windows服务器
scp full_backup.sql windows-server:/tmp/

3. 在Windows服务器安装MySQL
# 下载MySQL安装包并安装

4. 在Windows服务器导入数据
mysql -u root -p < C:\tmp\full_backup.sql 5. 验证数据 mysql -u root -p -e "SHOW DATABASES;" 输出示例：
+——————–+ | Database | +——————–+ | information_schema | | mysql | |
performance_schema | | sys | | test_db | +——————–+