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https://dev.mysql.com/doc/refman/5.7/en/innodb-file-format-compatibility.html
The system tablespace (represented by the ibdata files) is tagged with the “highest” file format in use in a group of InnoDB database files, and this tag is checked when the files are opened. InnoDB incorporates several checks to guard against ...
https://dev.mysql.com/doc/refman/5.7/en/locale-support.html
The lc_time_names value does not affect the result from FORMAT(), but this function takes an optional third parameter that enables a locale to be specified to be used for the result number's decimal point, thousands separator, and grouping between ... The locale indicated by the lc_time_names system variable controls the language used to display day and month names and ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-stage-summary-tables.html
Each stage summary table has one or more grouping columns to indicate how the table aggregates events. The Performance Schema maintains tables for collecting current and recent stage events, and aggregates that information in summary tables.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-wait-summary-tables.html
Each wait event summary table has one or more grouping columns to indicate how the table aggregates events. The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables.
https://dev.mysql.com/doc/refman/5.7/en/server-configuration.html
The MySQL server, mysqld, has many command options and system variables that can be set at startup to configure its operation. To determine the default command option and system variable values used by the server, execute this command: $> mysqld ...
https://dev.mysql.com/doc/refman/5.7/en/user-variables.html
You can store a value in a user-defined variable in one statement and refer to it later in another statement. This enables you to pass values from one statement to another. User variables are written as @var_name, where the variable name var_name ...
https://dev.mysql.com/doc/refman/5.7/en/working-with-null.html
Two NULL values are regarded as equal in a GROUP BY. The NULL value can be surprising until you get used to it. Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. In MySQL, 0 or NULL ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/5.7/en/apache.html
There are programs that let you authenticate your users from a MySQL database and also let you write your log files into a MySQL table.
https://dev.mysql.com/doc/refman/5.7/en/charset-metadata.html
Metadata is “the data about the data.” Anything that describes the database—as opposed to being the contents of the database—is metadata. Thus column names, database names, user names, version names, and most of the string results from SHOW ...