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https://dev.mysql.com/doc/refman/8.0/en/outer-join-simplification.html
Table expressions in the FROM clause of a query are simplified in many cases. At the parser stage, queries with right outer join operations are converted to equivalent queries containing only left join operations. When the optimizer evaluates plans ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-upgrade.html
Note As of MySQL 8.0.16, the MySQL server performs the upgrade tasks previously handled by mysql_upgrade (for details, see Section 3.4, “What the MySQL Upgrade Process Upgrades”). Consequently, mysql_upgrade is unneeded and is deprecated as of ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
This section summarizes what has been added to, deprecated in, and removed from MySQL 8.0. A companion section lists MySQL server options and variables that have been added, deprecated, or removed in MySQL 8.0; see Section 1.4, “Server and Status ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-logging.html
The mysql client can do these types of logging for statements executed interactively: On Unix, mysql writes the statements to a history file. By default, this file is named .mysql_history in your home directory. To specify a different file, set the ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndbd.html
The ndbd binary provides the single-threaded version of the process that is used to handle all the data in tables employing the NDBCLUSTER storage engine. This data node process enables a data node to accomplish distributed transaction handling, ...
https://dev.mysql.com/doc/refman/8.0/en/local-variable-scope.html
The scope of a local variable is the BEGIN ... The variable can be referred to in blocks nested within the declaring block, except those blocks that declare a variable with the same name. Because local variables are in scope only during stored ...
https://dev.mysql.com/doc/refman/8.0/en/stored-objects-security.html
Stored programs (procedures, functions, triggers, and events) and views are defined prior to use and, when referenced, execute within a security context that determines their privileges. The privileges applicable to execution of a stored object are ...
https://dev.mysql.com/doc/refman/8.0/en/with.html
A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple times. The following discussion describes how to write ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-optimization.html
Window functions affect the strategies the optimizer considers: Derived table merging for a subquery is disabled if the subquery has window functions. Semijoins are not applicable to window function optimization because semijoins apply to ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html
Before upgrading to MySQL 8.0, review the changes described in this section to identify those that apply to your current MySQL installation and applications. Changes marked as Incompatible change are incompatibilities with earlier versions of ...