{"id":14445,"date":"2020-07-24T16:12:55","date_gmt":"2020-07-24T14:12:55","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/changes-that-i-like-in-the-new-mysql-8-0-21\/"},"modified":"2020-07-24T16:12:55","modified_gmt":"2020-07-24T14:12:55","slug":"changes-that-i-like-in-the-new-mysql-8-0-21","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/changes-that-i-like-in-the-new-mysql-8-0-21\/","title":{"rendered":"Changes that I like in the new MySQL 8.0.21"},"content":{"rendered":"

A new release of MySQL was out on July 13 (8.0.21<\/a>).
\nAmong all the changes, there are some that I have already tested and that I really appreciate.
\n<\/p>\n

Who stopped the MySQL server?<\/h2>\n

In previous releases, I can already see in the error log file who stopped the MySQL server if this was done through the shutdown statement.
\nIn MySQL 8.0.20:<\/p>\n

\nmysql> shutdown;\nQuery OK, 0 rows affected (0.00 sec)\nmysql> exit;\nBye\n# tail -2 \/u01\/app\/mysql\/admin\/mysqld2\/log\/mysqld2.err\n2020-07-23T20:39:08.049064+02:00 9 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.20).\n2020-07-23T20:39:09.796726+02:00 0 [System] [MY-010910] [Server] \/u01\/app\/mysql\/product\/mysql-8.0.20\/bin\/mysqld: Shutdown complete (mysqld 8.0.20)  MySQL Community Server - GPL.\n<\/pre>\n
In MySQL 8.0.21:<\/p>\n
\nmysql> shutdown;\nQuery OK, 0 rows affected (0.00 sec)\nmysql> exit;\nBye\n# tail -2 \/u01\/app\/mysql\/admin\/mysqld1\/log\/mysqld1.err\n2020-07-23T20:39:15.725223+02:00 9 [System] [MY-013172] [Server] Received SHUTDOWN from user root. Shutting down mysqld (Version: 8.0.21).\n2020-07-23T20:39:17.029262+02:00 0 [System] [MY-010910] [Server] \/u01\/app\/mysql\/product\/mysql-8.0.21\/bin\/mysqld: Shutdown complete (mysqld 8.0.21)  MySQL Community Server - GPL.\n<\/pre>\n
But when the server was stopped through the systemctl command, this information was lost:<\/p>\n
\n# systemctl stop mysqld\n# tail -2 \/u01\/app\/mysql\/admin\/mysqld2\/log\/mysqld2.err\n2020-07-23T20:56:23.488468+02:00 0 [ERROR] [MY-010119] [Server] Aborting\n2020-07-23T20:56:23.489010+02:00 0 [System] [MY-010910] [Server] \/u01\/app\/mysql\/product\/mysql-8.0.20\/bin\/mysqld: Shutdown complete (mysqld 8.0.20)  MySQL Community Server - GPL.\n<\/pre>\n
As of MySQL 8.0.21, the error log file traces who stopped the MySQL server in any case (except if you are using the kill -9 command):<\/p>\n
\n# systemctl stop mysqld\n# tail -2 \/u01\/app\/mysql\/admin\/mysqld1\/log\/mysqld1.err\n2020-07-23T21:01:00.731589+02:00 0 [System] [MY-013172] [Server] Received SHUTDOWN from user . Shutting down mysqld (Version: 8.0.21).\n2020-07-23T21:01:01.560078+02:00 0 [System] [MY-010910] [Server] \/u01\/app\/mysql\/product\/mysql-8.0.21\/bin\/mysqld: Shutdown complete (mysqld 8.0.21)  MySQL Community Server - GPL.\n<\/pre>\n
How can I enable\/disable redo logging?<\/h2>\n
This is a nice but dangerous feature. Disable redo logging can be interesting when creating a new instance to avoid wasting time during redo log writes and doublewrite buffering operations. But otherwise don’t do that in your production environment!
\nCheck if redo logging is enabled:<\/p>\n
\nmysql> SHOW GLOBAL STATUS LIKE 'Innodb_redo_log_enabled';\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| Innodb_redo_log_enabled | ON    |\n+-------------------------+-------+\n<\/pre>\n
Create an user account with permissions to execute these operations:<\/p>\n
\nmysql> GRANT INNODB_REDO_LOG_ENABLE ON *.* to 'load'@'localhost';\n<\/pre>\n
Connect to the MySQL server with the load<\/em> user and disable redo logging:<\/p>\n
\nmysql> ALTER INSTANCE DISABLE INNODB REDO_LOG;\nmysql> SHOW GLOBAL STATUS LIKE 'Innodb_redo_log_enabled';\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| Innodb_redo_log_enabled | OFF   |\n+-------------------------+-------+\n<\/pre>\n
You can now load your data into the system, then enable again redo logging:<\/p>\n
\nmysql> ALTER INSTANCE ENABLE INNODB REDO_LOG;\nmysql> SHOW GLOBAL STATUS LIKE 'Innodb_redo_log_enabled';\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| Innodb_redo_log_enabled | ON    |\n+-------------------------+-------+\n<\/pre>\n
What if we add attributes and comments to MySQL user accounts?<\/h2>\n
As of MySQL 8.0.21, we can add attributes as a JSON object and comments during the creation of MySQL user accounts.
\nA comment:<\/p>\n
\nmysql> CREATE USER 'backup'@'localhost' identified by 'Supercal1frag1l1st1cexp1al1doc10us!' COMMENT 'This is the user account used to backup the MySQL server';\nmysql> select User, Host, User_attributes from mysql.user\n    -> where User='backup';\n+--------+-----------+---------------------------------------------------------------------------------------+\n| User   | Host      | User_attributes                                                                       |\n+--------+-----------+---------------------------------------------------------------------------------------+\n| backup | localhost | {\"metadata\": {\"comment\": \"This is the user account used to backup the MySQL server\"}} |\n+--------+-----------+---------------------------------------------------------------------------------------+\nmysql> select * from INFORMATION_SCHEMA.USER_ATTRIBUTES \n   -> where USER='backup';\n+--------+-----------+-------------------------------------------------------------------------+\n| USER   | HOST      | ATTRIBUTE                                                               |\n+--------+-----------+-------------------------------------------------------------------------+\n| backup | localhost | {\"comment\": \"This is the user account used to backup the MySQL server\"} |\n+--------+-----------+-------------------------------------------------------------------------+\n<\/pre>\n
An attribute:<\/p>\n
\nmysql> CREATE USER 'elisa'@'localhost' identified by 'CatchMe1fY0uCan!' ATTRIBUTE '{\"LastName\": \"Usai\", \"FirstName\": \"Elisa\", \"Email\": \"elisa.usai@dbi-services.com\", \"Department\": \"DBA Team\"}';\nmysql> select User, Host, User_attributes from mysql.user\n    -> where User='elisa';\n+-------+-----------+----------------------------------------------------------------------------------------------------------------------------+\n| User  | Host      | User_attributes                                                                                                            |\n+-------+-----------+----------------------------------------------------------------------------------------------------------------------------+\n| elisa | localhost | {\"metadata\": {\"Email\": \"elisa.usai@dbi-services.com\", \"LastName\": \"Usai\", \"FirstName\": \"Elisa\", \"Department\": \"DBA Team\"}} |\n+-------+-----------+----------------------------------------------------------------------------------------------------------------------------+\nmysql> select * from INFORMATION_SCHEMA.USER_ATTRIBUTES\n   -> where User='elisa';\n+-------+-----------+--------------------------------------------------------------------------------------------------------------+\n| USER  | HOST      | ATTRIBUTE                                                                                                    |\n+-------+-----------+--------------------------------------------------------------------------------------------------------------+\n| elisa | localhost | {\"Email\": \"elisa.usai@dbi-services.com\", \"LastName\": \"Usai\", \"FirstName\": \"Elisa\", \"Department\": \"DBA Team\"} |\n+-------+-----------+--------------------------------------------------------------------------------------------------------------+\nmysql> select user as User,\n    -> host as Host,\n    -> concat(attribute->>\"$.LastName\",\" \",attribute->>\"$.FirstName\") as 'Name',\n    -> attribute->>\"$.Department\" as Department,\n    -> attribute->>\"$.Email\" as Email\n    -> from INFORMATION_SCHEMA.USER_ATTRIBUTES\n    -> where user='elisa';\n+-------+-----------+------------+------------+-----------------------------+\n| User  | Host      | Name       | Department | Email                       |\n+-------+-----------+------------+------------+-----------------------------+\n| elisa | localhost | Usai Elisa | DBA Team   | elisa.usai@dbi-services.com |\n+-------+-----------+------------+------------+-----------------------------+\n<\/pre>\n
Check your backups execution!<\/h2>\n
With the MySQL 8.0.21 release, your backup through mysqldump could fail with the following error:<\/p>\n
 \n# mysqldump --all-databases --user=backup --password > test.sql\nEnter password:\nmysqldump: Error: 'Access denied; you need (at least one of) the PROCESS privilege(s) for this operation' when trying to dump tablespaces\nmysql> show grants for backup@localhost;\n+------------------------------------------------------------------------------+\n| Grants for backup@localhost                                                  |\n+------------------------------------------------------------------------------+\n| GRANT SELECT, LOCK TABLES, SHOW VIEW, TRIGGER ON *.* TO `backup`@`localhost` |\n+------------------------------------------------------------------------------+\n<\/pre>\n
Why? Actually in the new release the INFORMATION_SCHEMA.FILES table requires by now the PROCESS privilege and this change has an impact on mysqldump operations:<\/p>\n
 \nmysql> grant PROCESS ON *.* TO `backup`@`localhost`;\nQuery OK, 0 rows affected (0.02 sec)\n# mysqldump --all-databases --user=backup --password > test.sql\nEnter password:\n<\/pre>\n
And as usual, stay tuned with MySQL! \ud83d\ude42
\nby Elisa Usai<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
A new release of MySQL was out on July 13 (8.0.21). Among all the changes, there are some that I have already tested and that I really appreciate.<\/p>\n","protected":false},"author":42,"featured_media":14446,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,1316],"tags":[2041,694,144,282],"type_dbi":[],"class_list":["post-14445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring","category-mysql","tag-innodb","tag-json","tag-mysql","tag-redo-log"],"acf":[],"yoast_head":"\nChanges that I like in the new MySQL 8.0.21 - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/changes-that-i-like-in-the-new-mysql-8-0-21\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Changes that I like in the new MySQL 8.0.21\" \/>\n<meta property=\"og:description\" content=\"A new release of MySQL was out on July 13 (8.0.21). 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