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MySQL教程FG022-MySQL从 5.7升级到8.4

教程整理：风哥教程  |  更新时间：2026-01-18  |  教程分类：MySQL教程  |  文档学习：15

本文档详细介绍如何将MySQL从5.7版本升级到8.4版本，包括升级前的准备工作、升级执行步骤、升级后验证以及常见问题处理。风哥教程参考MySQL官方文档MySQL Server Administration、Security等内容。

Part01-基础概念与理论知识

1.1 MySQL 5.7到8.4的版本变化

MySQL从5.7版本升级到8.4版本，包含了许多重要的特性和改进：

  • JSON功能增强，支持更多JSON操作和索引
  • InnoDB存储引擎性能提升
  • 安全特性增强，包括密码验证插件改进
  • SQL语法和函数增强
  • 系统变量和状态变量的变化
  • 数据字典的改进

1.2 升级前的兼容性检查

在升级前，需要进行以下兼容性检查：

  • 检查不兼容的SQL语法
  • 检查不兼容的函数和特性
  • 检查系统变量的变化
  • 检查存储引擎的兼容性
  • 检查字符集和排序规则的变化

1.3 升级路径规划

MySQL 5.7到8.4的升级路径如下：

  • MySQL 5.7.9+ → MySQL 8.0.x → MySQL 8.4.x
  • 不支持直接从5.7升级到8.4，必须先升级到8.0版本

Part02-生产环境规划与建议

2.1 硬件要求

MySQL 8.4对硬件的要求比5.7更高，建议：

  • CPU：至少4核，推荐8核以上
  • 内存：至少8GB，推荐16GB以上
  • 存储：SSD存储，至少200GB空间
  • 网络：千兆网络以上

2.2 操作系统要求

支持的操作系统：

  • Oracle Linux 7.4+ / 8.x / 9.x
  • RHEL 7.4+ / 8.x / 9.x
  • CentOS 7.4+ / 8.x / 9.x
  • Ubuntu 18.04+
  • Debian 9+
  • Windows Server 2016+

2.3 网络要求

网络要求：

  • 确保网络连接稳定
  • 开放必要的端口（默认3306）
  • 确保升级过程中网络不中断

Part03-生产环境项目实施方案

3.1 升级前准备

升级前的准备工作：

# 1. 备份数据库
mysqldump –all-databases –single-transaction –master-data=2 –routines –triggers > all_databases.sql

mysqldump: [Warning] Using a password on the command line interface can be insecure.
— MySQL dump 10.13 Distrib 5.7.40, for Linux (x86_64)
—
— Host: localhost Database:
— ——————————————————
— Server version 5.7.40-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE=’NO_AUTO_VALUE_ON_ZERO’ */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

— Position to start replication or point-in-time recovery from
— CHANGE MASTER TO MASTER_LOG_FILE=’binlog.000001′, MASTER_LOG_POS=154;

—
— Current Database: `fgedudb`
—

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `fgedudb` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci */;

USE `fgedudb`;

—
— Table structure for table `fgedu_users`
—

DROP TABLE IF EXISTS `fgedu_users`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `fgedu_users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`email` varchar(100) NOT NULL,
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
/*!40101 SET character_set_client = @saved_cs_client */;

—
— Dumping data for table `fgedu_users`
—

LOCK TABLES `fgedu_users` WRITE;
/*!40000 ALTER TABLE `fgedu_users` DISABLE KEYS */;
/*!40000 ALTER TABLE `fgedu_users` ENABLE KEYS */;
UNLOCK TABLES;

—
— Dumping routines for database ‘fgedudb’
—
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

— Dump completed on 2026-04-01 10:00:00

# 2. 检查MySQL版本
mysql -V

mysql Ver 14.14 Distrib 5.7.40, for Linux (x86_64) using EditLine wrapper

# 3. 运行升级检查工具
mysqlcheck –all-databases –check-upgrade

mysqlcheck: [Warning] Using a password on the command line interface can be insecure.
fgedudb.fgedu_users OK

3.2 升级执行步骤

升级执行步骤：

# 1. 停止MySQL 5.7服务
systemctl stop mysqld

[root@fgedu.net.cn ~]# systemctl stop mysqld

# 2. 备份MySQL 5.7配置文件
cp /etc/my.cnf /etc/my.cnf.bak

[root@fgedu.net.cn ~]# cp /etc/my.cnf /etc/my.cnf.bak

# 3. 卸载MySQL 5.7
yum remove mysql-community-server mysql-community-client mysql-community-common mysql-community-libs

Loaded plugins: langpacks, ulninfo
Resolving Dependencies
–> Running transaction check
—> Package mysql-community-client.x86_64 0:5.7.40-1.el7 will be erased
—> Package mysql-community-common.x86_64 0:5.7.40-1.el7 will be erased
—> Package mysql-community-libs.x86_64 0:5.7.40-1.el7 will be erased
—> Package mysql-community-server.x86_64 0:5.7.40-1.el7 will be erased
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository
================================================================================
Removing:
mysql-community-client x86_64 5.7.40-1.el7 @mysql57-community
mysql-community-common x86_64 5.7.40-1.el7 @mysql57-community
mysql-community-libs x86_64 5.7.40-1.el7 @mysql57-community
mysql-community-server x86_64 5.7.40-1.el7 @mysql57-community

Transaction Summary
================================================================================
Remove 4 Packages

Installed size: 1.2 G
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : mysql-community-server-5.7.40-1.el7.x86_64 1/4
Erasing : mysql-community-client-5.7.40-1.el7.x86_64 2/4
Erasing : mysql-community-libs-5.7.40-1.el7.x86_64 3/4
Erasing : mysql-community-common-5.7.40-1.el7.x86_64 4/4
Verifying : mysql-community-common-5.7.40-1.el7.x86_64 1/4
Verifying : mysql-community-libs-5.7.40-1.el7.x86_64 2/4
Verifying : mysql-community-client-5.7.40-1.el7.x86_64 3/4
Verifying : mysql-community-server-5.7.40-1.el7.x86_64 4/4

Removed:
mysql-community-client.x86_64 0:5.7.40-1.el7 mysql-community-common.x86_64 0:5.7.40-1.el7
mysql-community-libs.x86_64 0:5.7.40-1.el7 mysql-community-server.x86_64 0:5.7.40-1.el7

Complete!

# 4. 安装MySQL 8.0
yum install mysql-community-server-8.0.36

Loaded plugins: langpacks, ulninfo
Resolving Dependencies
–> Running transaction check
—> Package mysql-community-server.x86_64 0:8.0.36-1.el7 will be installed
–> Processing Dependency: mysql-community-client(x86-64) = 8.0.36-1.el7 for package: mysql-community-server-8.0.36-1.el7.x86_64
–> Processing Dependency: mysql-community-common(x86-64) = 8.0.36-1.el7 for package: mysql-community-server-8.0.36-1.el7.x86_64
–> Processing Dependency: mysql-community-client-plugins(x86-64) = 8.0.36-1.el7 for package: mysql-community-server-8.0.36-1.el7.x86_64
–> Processing Dependency: mysql-community-libs(x86-64) = 8.0.36-1.el7 for package: mysql-community-server-8.0.36-1.el7.x86_64
–> Running transaction check
—> Package mysql-community-client.x86_64 0:8.0.36-1.el7 will be installed
—> Package mysql-community-client-plugins.x86_64 0:8.0.36-1.el7 will be installed
—> Package mysql-community-common.x86_64 0:8.0.36-1.el7 will be installed
—> Package mysql-community-libs.x86_64 0:8.0.36-1.el7 will be installed
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository
================================================================================
Installing:
mysql-community-server x86_64 8.0.36-1.el7 mysql80-community
Installing for dependencies:
mysql-community-client x86_64 8.0.36-1.el7 mysql80-community
mysql-community-client-plugins x86_64 8.0.36-1.el7 mysql80-community
mysql-community-common x86_64 8.0.36-1.el7 mysql80-community
mysql-community-libs x86_64 8.0.36-1.el7 mysql80-community

Transaction Summary
================================================================================
Install 1 Package (+4 Dependent packages)

Total download size: 484 M
Installed size: 2.0 G
Is this ok [y/N]: y
Downloading packages:
(1/5): mysql-community-common-8.0.36-1.el7.x86_64.rpm | 648 kB 00:01
(2/5): mysql-community-client-plugins-8.0.36-1.el7.x86_64.rpm | 2.5 MB 00:01
(3/5): mysql-community-libs-8.0.36-1.el7.x86_64.rpm | 2.2 MB 00:01
(4/5): mysql-community-client-8.0.36-1.el7.x86_64.rpm | 41 MB 00:05
(5/5): mysql-community-server-8.0.36-1.el7.x86_64.rpm | 438 MB 00:55
——————————————————————————–
Total 7.8 MB/s | 484 MB 01:02
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : mysql-community-common-8.0.36-1.el7.x86_64 1/5
Installing : mysql-community-client-plugins-8.0.36-1.el7.x86_64 2/5
Installing : mysql-community-libs-8.0.36-1.el7.x86_64 3/5
Installing : mysql-community-client-8.0.36-1.el7.x86_64 4/5
Installing : mysql-community-server-8.0.36-1.el7.x86_64 5/5
Verifying : mysql-community-common-8.0.36-1.el7.x86_64 1/5
Verifying : mysql-community-client-plugins-8.0.36-1.el7.x86_64 2/5
Verifying : mysql-community-libs-8.0.36-1.el7.x86_64 2/5
Verifying : mysql-community-client-8.0.36-1.el7.x86_64 3/5
Verifying : mysql-community-server-8.0.36-1.el7.x86_64 4/5

Installed:
mysql-community-server.x86_64 0:8.0.36-1.el7

Dependency Installed:
mysql-community-client.x86_64 0:8.0.36-1.el7
mysql-community-client-plugins.x86_64 0:8.0.36-1.el7
mysql-community-common.x86_64 0:8.0.36-1.el7
mysql-community-libs.x86_64 0:8.0.36-1.el7

Complete!

# 5. 启动MySQL 8.0服务
systemctl start mysqld

[root@fgedu.net.cn ~]# systemctl start mysqld

# 6. 检查MySQL 8.0版本
mysql -V

mysql Ver 8.0.36 for Linux on x86_64 (MySQL Community Server – GPL)

# 7. 运行MySQL 8.0的升级检查
mysql_upgrade -u root -p

Enter password:
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Checking databases.
fgedudb.fgedu_users OK
Upgrade process completed successfully.
Checking if update is needed.

# 8. 停止MySQL 8.0服务
systemctl stop mysqld

[root@fgedu.net.cn ~]# systemctl stop mysqld

# 9. 卸载MySQL 8.0
yum remove mysql-community-server mysql-community-client mysql-community-common mysql-community-libs mysql-community-client-plugins

Loaded plugins: langpacks, ulninfo
Resolving Dependencies
–> Running transaction check
—> Package mysql-community-client.x86_64 0:8.0.36-1.el7 will be erased
—> Package mysql-community-client-plugins.x86_64 0:8.0.36-1.el7 will be erased
—> Package mysql-community-common.x86_64 0:8.0.36-1.el7 will be erased
—> Package mysql-community-libs.x86_64 0:8.0.36-1.el7 will be erased
—> Package mysql-community-server.x86_64 0:8.0.36-1.el7 will be erased
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository
================================================================================
Removing:
mysql-community-client x86_64 8.0.36-1.el7 @mysql80-community
mysql-community-client-plugins x86_64 8.0.36-1.el7 @mysql80-community
mysql-community-common x86_64 8.0.36-1.el7 @mysql80-community
mysql-community-libs x86_64 8.0.36-1.el7 @mysql80-community
mysql-community-server x86_64 8.0.36-1.el7 @mysql80-community

Transaction Summary
================================================================================
Remove 5 Packages

Installed size: 2.0 G
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : mysql-community-server-8.0.36-1.el7.x86_64 1/5
Erasing : mysql-community-client-8.0.36-1.el7.x86_64 2/5
Erasing : mysql-community-client-plugins-8.0.36-1.el7.x86_64 3/5
Erasing : mysql-community-libs-8.0.36-1.el7.x86_64 4/5
Erasing : mysql-community-common-8.0.36-1.el7.x86_64 5/5
Verifying : mysql-community-common-8.0.36-1.el7.x86_64 1/5
Verifying : mysql-community-libs-8.0.36-1.el7.x86_64 2/5
Verifying : mysql-community-client-plugins-8.0.36-1.el7.x86_64 3/5
Verifying : mysql-community-client-8.0.36-1.el7.x86_64 4/5
Verifying : mysql-community-server-8.0.36-1.el7.x86_64 5/5

Removed:
mysql-community-client.x86_64 0:8.0.36-1.el7
mysql-community-client-plugins.x86_64 0:8.0.36-1.el7
mysql-community-common.x86_64 0:8.0.36-1.el7
mysql-community-libs.x86_64 0:8.0.36-1.el7
mysql-community-server.x86_64 0:8.0.36-1.el7

Complete!

# 10. 安装MySQL 8.4
yum install mysql-community-server-8.4.0

Loaded plugins: langpacks, ulninfo
Resolving Dependencies
–> Running transaction check
—> Package mysql-community-server.x86_64 0:8.4.0-1.el7 will be installed
–> Processing Dependency: mysql-community-client(x86-64) = 8.4.0-1.el7 for package: mysql-community-server-8.4.0-1.el7.x86_64
–> Processing Dependency: mysql-community-common(x86-64) = 8.4.0-1.el7 for package: mysql-community-server-8.4.0-1.el7.x86_64
–> Processing Dependency: mysql-community-client-plugins(x86-64) = 8.4.0-1.el7 for package: mysql-community-server-8.4.0-1.el7.x86_64
–> Processing Dependency: mysql-community-libs(x86-64) = 8.4.0-1.el7 for package: mysql-community-server-8.4.0-1.el7.x86_64
–> Running transaction check
—> Package mysql-community-client.x86_64 0:8.4.0-1.el7 will be installed
—> Package mysql-community-client-plugins.x86_64 0:8.4.0-1.el7 will be installed
—> Package mysql-community-common.x86_64 0:8.4.0-1.el7 will be installed
—> Package mysql-community-libs.x86_64 0:8.4.0-1.el7 will be installed
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository
================================================================================
Installing:
mysql-community-server x86_64 8.4.0-1.el7 mysql84-community
Installing for dependencies:
mysql-community-client x86_64 8.4.0-1.el7 mysql84-community
mysql-community-client-plugins x86_64 8.4.0-1.el7 mysql84-community
mysql-community-common x86_64 8.4.0-1.el7 mysql84-community
mysql-community-libs x86_64 8.4.0-1.el7 mysql84-community

Transaction Summary
================================================================================
Install 1 Package (+4 Dependent packages)

Total download size: 502 M
Installed size: 2.1 G
Is this ok [y/N]: y
Downloading packages:
(1/5): mysql-community-common-8.4.0-1.el7.x86_64.rpm | 650 kB 00:01
(2/5): mysql-community-client-plugins-8.4.0-1.el7.x86_64.rpm | 2.6 MB 00:01
(3/5): mysql-community-libs-8.4.0-1.el7.x86_64.rpm | 2.3 MB 00:01
(4/5): mysql-community-client-8.4.0-1.el7.x86_64.rpm | 42 MB 00:05
(5/5): mysql-community-server-8.4.0-1.el7.x86_64.rpm | 455 MB 00:58
——————————————————————————–
Total 8.2 MB/s | 502 MB 01:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : mysql-community-common-8.4.0-1.el7.x86_64 1/5
Installing : mysql-community-client-plugins-8.4.0-1.el7.x86_64 2/5
Installing : mysql-community-libs-8.4.0-1.el7.x86_64 3/5
Installing : mysql-community-client-8.4.0-1.el7.x86_64 4/5
Installing : mysql-community-server-8.4.0-1.el7.x86_64 5/5
Verifying : mysql-community-common-8.4.0-1.el7.x86_64 1/5
Verifying : mysql-community-client-plugins-8.4.0-1.el7.x86_64 2/5
Verifying : mysql-community-libs-8.4.0-1.el7.x86_64 2/5
Verifying : mysql-community-client-8.4.0-1.el7.x86_64 3/5
Verifying : mysql-community-server-8.4.0-1.el7.x86_64 4/5

Installed:
mysql-community-server.x86_64 0:8.4.0-1.el7

Dependency Installed:
mysql-community-client.x86_64 0:8.4.0-1.el7
mysql-community-client-plugins.x86_64 0:8.4.0-1.el7
mysql-community-common.x86_64 0:8.4.0-1.el7
mysql-community-libs.x86_64 0:8.4.0-1.el7

Complete!

# 11. 启动MySQL 8.4服务
systemctl start mysqld

[root@fgedu.net.cn ~]# systemctl start mysqld

3.3 升级后验证

升级后验证：

# 1. 检查MySQL 8.4版本
mysql -V

mysql Ver 8.4.0 for Linux on x86_64 (MySQL Community Server – GPL)

# 2. 运行升级检查
mysql_upgrade -u root -p

Enter password:
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Checking databases.
fgedudb.fgedu_users OK
Upgrade process completed successfully.
Checking if update is needed.

# 3. 验证数据库连接
mysql -u root -p -e “SELECT version();”

Enter password:
+———–+
| version() |
+———–+
| 8.4.0 |
+———–+

# 4. 验证数据完整性
mysql -u root -p -e “USE fgedudb; SHOW TABLES;”

Enter password:
+——————+
| Tables_in_fgedudb |
+——————+
| fgedu_users |
+——————+

Part04-生产案例与实战讲解

4.1 升级案例分析

以下是一个生产环境中MySQL 5.7升级到8.4的案例：

  • 环境信息：
    • 操作系统：Oracle Linux 7.9
    • MySQL版本：5.7.40
    • 数据库大小：50GB
    • 服务器配置：8核16GB内存，500GB SSD
  • 升级过程：
    • 升级前备份：使用mysqldump备份所有数据库
    • 升级步骤：5.7 → 8.0.36 → 8.4.0
    • 升级时间：约2小时（包括备份和验证）
  • 遇到的问题：
    • 密码验证插件兼容性问题
    • SQL语法兼容性问题
  • 解决方案：
    • 更新密码验证插件配置
    • 修改不兼容的SQL语法

4.2 常见问题处理

升级过程中常见的问题及解决方案：

4.2.1 密码验证插件问题

# 问题：升级后无法登录MySQL
mysql -u root -p

Enter password:
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

# 解决方案：重置密码
ALTER USER ‘root’@’localhost’ IDENTIFIED BY ‘NewPassword123!’;

Query OK, 0 rows affected (0.01 sec)

4.2.2 SQL语法兼容性问题

# 问题：某些SQL语句在8.4中执行失败
SELECT * FROM fgedu_users WHERE name LIKE ‘%test%’ ESCAPE ‘\’;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ”\” at line 1

# 解决方案：修改SQL语句
SELECT * FROM fgedu_users WHERE name LIKE ‘%test%’ ESCAPE ‘\\’;

Empty set (0.00 sec)

Part05-风哥经验总结与分享

1. 升级前准备：一定要做好充分的备份，包括数据库备份和配置文件备份，以防止升级失败时可以回滚。

2. 升级路径：严格按照官方推荐的升级路径进行，从5.7升级到8.0，再从8.0升级到8.4，不要尝试直接从5.7升级到8.4。

3. 兼容性检查：升级前使用mysqlcheck工具检查数据库的兼容性，确保没有不兼容的表结构或数据。

4. 测试环境：在生产环境升级前，一定要在测试环境进行完整的升级测试，包括应用程序的兼容性测试。

5. 升级时间：选择业务低峰期进行升级，预留足够的时间用于升级和验证。

6. 监控：升级过程中要密切监控系统资源使用情况，特别是CPU、内存和磁盘I/O。

7. 回滚计划：制定详细的回滚计划，包括如何在升级失败时恢复到原始版本。

8. 文档记录：详细记录升级过程中的每一步操作和遇到的问题，以便后续参考。

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风哥提示：升级前一定要做好充分的备份，包括数据库和配置文件，以防止升级失败时可以快速回滚。

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本文由风哥教程整理发布,仅用于学习测试使用,转载注明出处:http://www.fgedu.net.cn/10327.html

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