注：本文在测试环境升级测试，建议先在测试环境验证。mysql-5.7.42为rpm安装，所以用rpm方式升级
1、升级准备
1、数据备份：在升级之前，务必对当前的 MySQL 5.7 数据库进行完整备份，以防止数据丢失或损坏。确保备份文件的安全存储，并测试其可恢复性。
2、安全性考虑：建议在测试环境中进行升级测试，以模拟真实场景并检测潜在问题。这有助于减少生产环境中的不确定性和风险。
1、使用mysql-shell 检查工具检查兼容性
下载地址：https://downloads.mysql.com/archives/shell/
上传mysql-shell：
安装 mysql-shell rpm 软件包：：
rpm -Uvh mysql-shell-8.2.0-1.el7.x86_64.rpm --force --nodeps
查看 mysql-shel安装版本：
mysqlsh --version
检查该版本是否可以升级到MySQL 8.2.0：
mysqlsh -uroot -p -S /var/lib/mysql/mysql.sock -e "util.checkForServerUpgrade()"
检查结果报告：
[root@zyl-server ~]# mysqlsh -uroot -p -S /var/lib/mysql/mysql.sock -e "util.checkForServerUpgrade()"
Please provide the password for 'root@/var%2Flib%2Fmysql%2Fmysql.sock': ********（zyl@2024）
Save password for 'root@/var%2Flib%2Fmysql%2Fmysql.sock'? [Y]es/[N]o/Ne[v]er (default No): Y
The MySQL server at /var%2Flib%2Fmysql%2Fmysql.sock, version 5.7.42 - MySQL
Community Server (GPL), will now be checked for compatibility issues for
upgrade to MySQL 8.2.0...
1) Usage of old temporal type
No issues found
2) MySQL 8.0 syntax check for routine-like objects
No issues found
3) Usage of db objects with names conflicting with new reserved keywords
No issues found
4) Usage of utf8mb3 charset
No issues found
5) Table names in the mysql schema conflicting with new tables in 8.0
No issues found
6) Partitioned tables using engines with non native partitioning
No issues found
7) Foreign key constraint names longer than 64 characters
No issues found
8) Usage of obsolete MAXDB sql_mode flag
No issues found
9) Usage of obsolete sql_mode flags
Notice: The following DB objects have obsolete options persisted for
sql_mode, which will be cleared during upgrade to 8.0.
More information:
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html#mysql-nutshell-removals
db_zyl.InsertMultipleUsers - PROCEDURE uses obsolete NO_AUTO_CREATE_USER
sql_mode
global system variable sql_mode - defined using obsolete NO_AUTO_CREATE_USER
option
10) ENUM/SET column definitions containing elements longer than 255 characters
No issues found
11) Usage of partitioned tables in shared tablespaces
No issues found
12) Circular directory references in tablespace data file paths
No issues found
13) Usage of removed functions
No issues found
14) Usage of removed GROUP BY ASC/DESC syntax
No issues found
15) Removed system variables for error logging to the system log configuration
To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
More information:
https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-13.html#mysqld-8-0-13-logging
16) Removed system variables
To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
More information:
https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html#optvars-removed
17) System variables with new default values
To run this check requires full path to MySQL server configuration file to be specified at 'configPath' key of options dictionary
More information:
https://mysqlserverteam.com/new-defaults-in-mysql-8-0/
18) Zero Date, Datetime, and Timestamp values
No issues found
19) Schema inconsistencies resulting from file removal or corruption
No issues found
20) Tables recognized by InnoDB that belong to a different engine
No issues found
21) Issues reported by 'check table x for upgrade' command
No issues found
22) New default authentication plugin considerations
Warning: The new default authentication plugin 'caching_sha2_password' offers
more secure password hashing than previously used 'mysql_native_password'
(and consequent improved client connection authentication). However, it also
has compatibility implications that may affect existing MySQL installations.
If your MySQL installation must serve pre-8.0 clients and you encounter
compatibility issues after upgrading, the simplest way to address those
issues is to reconfigure the server to revert to the previous default
authentication plugin (mysql_native_password). For example, use these lines
in the server option file:
[mysqld]
default_authentication_plugin=mysql_native_password
However, the setting should be viewed as temporary, not as a long term or
permanent solution, because it causes new accounts created with the setting
in effect to forego the improved authentication security.
If you are using replication please take time to understand how the
authentication plugin changes may impact you.
More information:
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password-compatibility-issues
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password-replication
23) Columns which cannot have default values
No issues found
24) Check for invalid table names and schema names used in 5.7
No issues found
25) Check for orphaned routines in 5.7
No issues found
26) Check for deprecated usage of single dollar signs in object names
No issues found
27) Check for indexes that are too large to work on higher versions of MySQL
Server than 5.7
No issues found
28) Check for deprecated '.
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