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https://dev.mysql.com/doc/refman/8.4/en/upgrade-troubleshooting.html
If problems occur, such as that the new mysqld server does not start, verify that you do not have an old my.cnf file from your previous installation. If this command displays anything other than the program name, you have an active my.cnf file that ... A schema mismatch in a MySQL 8.3 instance between the .frm file of a table and the InnoDB data dictionary can cause an upgrade to MySQL 8.4 to ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/meb-backup-process.html
In general, this is what happens when you run a backup operation with mysqlbackup: The InnoDB data files, redo log, binary log, and relay log files (except for the log files currently in use) are being copied into the backup, while the database ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/restore.html
Normally, the restoration process requires the database server to be already shut down (or, at least not operating on the directory you are restoring the data to), except for a partial restore. Example 5.1 Restoring a Database Server mysqlbackup ...
https://dev.mysql.com/doc/c-api/8.4/en/c-api-asynchronous-interface.html
As of MySQL 8.0.16, the C API includes asynchronous functions that enable nonblocking communication with the MySQL server. Asynchronous functions enable development of applications that differ from the query processing model based on synchronous ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-get-ssl-session-data.html
void * mysql_get_ssl_session_data(MYSQL *, unsigned int n_ticket, unsigned int *out_len) Description mysql_get_ssl_session_data() permits SSL session reuse by extracting a ticket from an established session and submitting that ticket when ...This ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-ping.html
int mysql_ping(MYSQL *mysql) Description Checks whether the connection to the server is working. mysql_ping() can be used by clients that remain idle for a long while, to check whether the server has closed the connection and reconnect if necessary. Return Values Zero if the connection to the server is ...If the connection has gone down and ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-shutdown.html
MySQL servers support only one type of shutdown; shutdown_level must be equal to SHUTDOWN_DEFAULT. CR_SERVER_LOST The connection to the server was lost during the query. int mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level ...
https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-17.html
It is suitable for use with MySQL Server versions 8.0, 5.7, and 5.6. (WL #13210) Added support for host names that are longer than 60 characters (up to 255 characters), as they are now supported by MySQL Server 8.0.17. (WL #13125) Added support for ... Version 8.0.17 is the latest General Availability release of the 8.0 series of MySQL ...
https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-30.html
It is suitable for use with MySQL Server versions 8.0 and 5.7. (Bug #34259416) Bugs Fixed Historically, MySQL Server has used utf8 as an alias for utf8mb3. Since release 8.0.29, utf8mb3 has become a recognized (though deprecated) character set on ...
https://dev.mysql.com/doc/refman/8.4/en/create-event.html
The ON SCHEDULE clause may use expressions involving built-in MySQL functions and user variables to obtain any of the timestamp or interval values which it contains. This enables event execution to proceed as defined regardless of any subsequent ...