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https://dev.mysql.com/doc/refman/8.4/en/replication-encrypted-connections.html
If this option is set to NULL when TLSv1.3 is used (which is the default if you do not set the option), the ciphersuites that are enabled by default are allowed. If you set the option to an empty string, no cipher suites are allowed, and TLSv1.3 is ... To use an encrypted connection for the transfer of the binary log required during replication, both the source and the replica servers must support encrypted network ...
https://dev.mysql.com/doc/refman/8.4/en/start-group-replication.html
You cannot specify an empty or null string, or omit the USER option if PASSWORD is specified. START GROUP_REPLICATION [USER='user_name'] [, PASSWORD='user_pass'] [, DEFAULT_AUTH='plugin_name'] Starts group replication. This statement requires the ...
https://dev.mysql.com/doc/refman/8.4/en/start-replica.html
The option cannot be set to an empty or null string. START REPLICA [thread_types] [until_option] [connection_options] [channel_option] thread_types: [thread_type [, thread_type] ... ] thread_type: IO_THREAD | SQL_THREAD until_option: UNTIL { ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/mysqlbackup.restore.html
240426 13:17:07 MAIN INFO: Backup Image MEB version string: 8.4.0 240426 13:17:07 MAIN INFO: MySQL server version is '8.4.0' 240426 13:17:07 MAIN INFO: Backup directory created: '/home/meb/mysql/backup-tmp2' 240426 13:17:07 MAIN WARNING: If you ...
https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-30.html
Version 8.0.30 is the latest General Availability release of the 8.0 series of MySQL Connector/J. It is suitable for use with MySQL Server versions 8.0 and 5.7. It supports the Java Database Connectivity (JDBC) 4.2 API, and implements the X DevAPI.
https://dev.mysql.com/doc/internals/en/packed-record-layout.html
pack bits (!= NULL bits!): One bit per packable column: FIELD_BLOB: Set if blob is empty. => The "pack bits" are rounded up to the next byte boundary. Each field is copied verbatim unless packed according to the "pack bits" paragraph.
https://dev.mysql.com/doc/relnotes/connector-odbc/en/news-9-0-0.html
Now the SQLConnect() values are prioritized except for SQLConnect() values defined as NULL. Functionality Added or Changed Bugs Fixed Functionality Added or Changed For the ANSI driver, converting to and from the character set specified by the ...
https://dev.mysql.com/doc/refman/8.4/en/audit-log-logging-configuration.html
If the system variable value is OFF, a null value is written to the log file for these fields. This section describes how to configure audit logging characteristics, such as the file to which the audit log plugin writes events, the format of ...
https://dev.mysql.com/doc/refman/8.4/en/charset-collation-implementations.html
Example: "U+0000 NULL" does not have a weight and is ignorable. mysql> SET NAMES 'utf8mb4' COLLATE 'utf8mb4_unicode_ci'; Query OK, 0 rows affected (0.05 sec) mysql> SELECT HEX('a'), HEX(WEIGHT_STRING('a')); +----------+-------------------------+ | ... MySQL implements several types of collations: Simple collations for 8-bit character sets This kind of collation is implemented using an array of 256 weights that defines a one-to-one mapping from character codes to ...
https://dev.mysql.com/doc/refman/8.4/en/example-foreign-keys.html
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column ...