Error in MySQL log files on Plesk server: Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14

Symptoms

• The following error can be found in /var/log/mysql.log on Plesk server:

  CONFIG_TEXT: [ERROR] Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14 to have type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','IGNORE_BAD_TABLE_OPTIONS','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE','NO_ENGINE_SUBSTITUTION','PAD_CHAR_TO_FULL_LENGTH'), found type set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_A

• MySQL was replaced with MariaDB some time ago or MySQL/MariaDB was upgraded to a higher version.

Cause

During the upgrade of MySQL/MariaDB, mysql_upgrade command was not executed or was executed with errors.

Resolution

1. Connect to the server via SSH.
2. Create a backup of /var/lib/mysql/

   # cp -a /var/lib/mysql/ /var/lib/mysql_backup/

3. Start mysql_upgrade with admin user credentials:

   # MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql_upgrade -uadmin

4. Restart MySQL service:

   # service mysql restart

5. In case the error will be the same, fix event table manually.
   Click here to reveal the manual fix procedure

   1. Enter the database as admin user:

      # plesk db

   2. Change the database to mysql:

      MYSQL_LIN: mysql> use mysql;

   3. Alter the table with the following query:

      MYSQL_LIN: mysql> ALTER TABLE `event` CHANGE `sql_mode` `sql_mode` SET( 'REAL_AS_FLOAT', 'PIPES_AS_CONCAT', 'ANSI_QUOTES', 'IGNORE_SPACE', 'IGNORE_BAD_TABLE_OPTIONS', 'ONLY_FULL_GROUP_BY', 'NO_UNSIGNED_SUBTRACTION', 'NO_DIR_IN_CREATE', 'POSTGRESQL', 'ORACLE', 'MSSQL', 'DB2', 'MAXDB', 'NO_KEY_OPTIONS', 'NO_TABLE_OPTIONS', 'NO_FIELD_OPTIONS', 'MYSQL323', 'MYSQL40', 'ANSI', 'NO_AUTO_VALUE_ON_ZERO', 'NO_BACKSLASH_ESCAPES', 'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES', 'NO_ZERO_IN_DATE', 'NO_ZERO_DATE', 'INVALID_DATES', 'ERROR_FOR_DIVISION_BY_ZERO', 'TRADITIONAL', 'NO_AUTO_CREATE_USER', 'HIGH_NOT_PRECEDENCE', 'NO_ENGINE_SUBSTITUTION', 'PAD_CHAR_TO_FULL_LENGTH' ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '';

   4. Restart MySQL once again:

      # service mysql restart