How to Upgrade Mysql 5.7 To Mysql 8

 How to Upgrade Mysql 5.7 To Mysql 8

Step.1.First we need to mysql8.0 repoon centos

yum install https://dev.mysql.com/get/mysql80-community-release-el6-11.noarch.rpm.




step.2.check yum list 



step.3. Install mysql shell for checking upgrade


step.4.login to mysqlshell



step.5. check upgrade for mysql using mysql-shell



https://dev.mysql.com/get/mysql80-community-release-el6-11.noarch.rpm MySQL  JS > util.checkForServerUpgrade("root@localhost:3306");

The MySQL server at localhost:3306, version 5.7.40 - MySQL Community Server

(GPL), will now be checked for compatibility issues for upgrade to MySQL

8.0.37...


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


  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: 1

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.


Step.6. run below command

step.9.check mysql service

systemctl status mysqld



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