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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-summary-tables.html
This value is calculated only for timed events because nontimed events have a wait time of NULL. The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables. Section ...
https://dev.mysql.com/doc/refman/8.0/en/plugin-loading.html
These can be identified as those that have a library name of NULL in the output from the Information Schema PLUGINS table or SHOW PLUGINS. Server plugins must be loaded into the server before they can be used. It is also possible to control the ...
https://dev.mysql.com/doc/refman/8.0/en/point-in-time-recovery-binlog.html
If your binary log contains \0 (null) characters, that output cannot be parsed by mysql unless you invoke it with the --binary-mode option. This section explains the general idea of using the binary log to perform a point-in-time-recovery. The next ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math.html
Similarly, you can treat division by zero as an error rather than as an operation that produces a result of NULL. MySQL provides support for precision math: numeric value handling that results in extremely accurate results and a high degree control ...
https://dev.mysql.com/doc/refman/8.0/en/query-attribute-components.html
Purpose: Implements the mysql_query_attribute_string() function that takes an attribute name argument and returns the attribute value as a string, or NULL if the attribute does not exist. As of MySQL 8.0.23, a component service provides access to ...
https://dev.mysql.com/doc/refman/8.0/en/rebuilding-tables.html
This section describes how to rebuild or repair tables or indexes, which may be necessitated by: Changes to how MySQL handles data types or character sets. For example, an error in a collation might have been corrected, necessitating a table ...
https://dev.mysql.com/doc/refman/8.0/en/replication-delayed.html
MySQL supports delayed replication such that a replica server deliberately executes transactions later than the source by at least a specified amount of time. This section describes how to configure a replication delay on a replica, and how to ...
https://dev.mysql.com/doc/refman/8.0/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. To use an encrypted connection for the transfer of the binary log required during ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-differing-tables.html
A column's default value is determined by a number of factors, including its type, whether it is defined with a DEFAULT option, whether it is declared as NULL, and the server SQL mode in effect at the time of its creation; for more information, see ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/doc/refman/8.0/en/replication-privilege-checks-gr.html
Group Replication requires every table that is to be replicated by the group to have a defined primary key, or primary key equivalent where the equivalent is a non-null unique key. From MySQL 8.0.19, as well as securing asynchronous and ...