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mysql> select@@version;

+-----------+

| @@version |

+-----------+

| 5.7.42    |

+-----------+

1 row in set (0.00 sec)

mysql>

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[root@zyl-server ~]#  cat /etc/redhat-release

CentOS Linux release 7.9.2009 (Core)

[root@zyl-server ~]#

[root@zyl-server ~]#

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ldd --version

或者

rpm -q glibc

**查看当前系统中的libstdc++版本：**

strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX

strings /usr/lib64/libstdc++.so.6 | grep CXXABI

strings /usr/lib64/libstdc++.so.6 | grep GLIBC

strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX

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rpm -Uvh mysql-shell-8.2.0-1.el7.x86_64.rpm --force --nodeps

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mysqlsh --version

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mysqlsh -uroot -p -S /tmp/mysqld.sock -e "util.checkForServerUpgrade()"

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[root@db-mysql ~]# mysqlsh -uroot -p -S /tmp/mysqld.sock -e "util.checkForServerUpgrade()"

Please provide the password for 'root@/tmp%2Fmysqld.sock': ******

Save password for 'root@/tmp%2Fmysqld.sock'? [Y]es/[N]o/Ne[v]er (default No):

The MySQL server at /tmp%2Fmysqld.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

  Warning: The following objects use the utf8mb3 character set. It is

    recommended to convert them to use utf8mb4 instead, for improved Unicode

    support.

  More information:

    https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf8mb3.html

  db_update - schema's default character set: utf8

  db_update.users.name - column's default character set: utf8

  db_update.users.email - column's default character set: utf8

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

  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 '.<table>' syntax used in routines.

  No issues found

29) Check for columns that have foreign keys pointing to tables from a diffrent

database engine.

  No issues found

Errors:   0

Warnings: 4

Notices:  1

NOTE: No fatal errors were found that would prevent an upgrade, but some potential issues were detected. Please ensure that the reported issues are not significant before upgrading.

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[root@db-mysql ~]#  mysqldump -hlocalhost -uroot -p --all-databases > /home/db_back_2024.sql

Enter password:

[root@db-mysql ~]# cd /home/                

[root@db-mysql home]# ll

total 872

-rw-r--r--  1 root   root     889253 Mar 20 20:25 db_back_2024.sql

drwx------  2 oracle oinstall    127 Mar 18 05:12 oracle

drwx------. 2 zyl    zyl          62 Mar 16 22:24 zyl

[root@db-mysql home]# cp /etc/my.cnf /home/5.7.37_my.cnf

[root@zyl-mysql home]#

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[root@db-mysql home]# systemctl stop mysqld

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cd /usr/local/

mkdir mysql-5.7.42_bk

##全部备份 mysql目录下的文件

cp -R mysql/* mysql-5.7.42_bk

### 或者直接压缩

### tar -zcvf mysql-5.7.42_bk.tar.gz mysql

[root@db-mysql bin]# tar zcf mysql-5.7.42_bk.tar.gz mysql

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cd /usr/local/mysql

rm -rf bin

rm -rf docs

rm -rf include

rm -rf lib

rm -rf README

rm -rf LICENSE

rm -rf share

rm -rf support-files

rm -rf man

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cd /etc/init.d/

tar zcf mysqld_5.7.42.tar.gz mysqld

rm -rf /etc/init.d/mysqld

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mkdir /root/mysql8.2.0-glibc

##解压

tar -xvf mysql-8.2.0-linux-glibc2.28-x86_64.tar -C /root/mysql8.2.0-glibc

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##继续解压

cd /root/mysql8.2.0-glibc

tar -xvf mysql-8.2.0-linux-glibc2.28-x86_64.tar.xz

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[root@db-mysql mysql8.2.0-glibc]# mv mysql-8.2.0-linux-glibc2.17-x86_64/* /usr/local/mysql

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##修改文件权限

chown -R mysql:mysql /usr/local/mysql

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cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

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vi /etc/init.d/mysqld

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datadir=/usr/local/mysql/data

basedir=/usr/local/mysql

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[root@db-mysql ~]# systemctl daemon-reload

[root@db-mysql ~]#

[root@db-mysql ~]# systemctl start mysqld

[root@db-mysql ~]#

[root@db-mysql ~]# systemctl status mysqld

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mysql -u root -p

[root@db-mysql mysql]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 10

Server version: 8.2.0 MySQL Community Server - GPL

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

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mysql> select@@version;

+-----------+

| @@version |

+-----------+

| 8.2.0     |

+-----------+

1 row in set (0.00 sec)

mysql>

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mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| db_update          |

| information_schema |

| mysql              |

| performance_schema |

| sys                |

+--------------------+

5 rows in set (0.01 sec)

mysql> use db_update;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> show tables;

+---------------------+

| Tables_in_db_update |

+---------------------+

| users               |

+---------------------+

1 row in set (0.00 sec)

mysql> select * from users;

+----+---------+------+---------------------+

| id | name    | age  | email               |

+----+---------+------+---------------------+

|  1 | Alice   |   25 | alice@example.com   |

|  2 | Bob     |   30 | bob@example.com     |

|  3 | Charlie |   22 | charlie@example.com |

|  4 | David   |   28 | david@example.com   |

|  5 | Eve     |   35 | eve@example.com     |

+----+---------+------+---------------------+

5 rows in set (0.00 sec)

mysql>