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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-connection-status-table.html
GROUP_NAME If this server is a member of a group, shows the name of the group the server belongs to. This table shows the current status of the replication I/O thread that handles the replica's connection to the source. It contains values that ...
https://dev.mysql.com/doc/refman/5.7/en/mysqld-multi.html
mysqld_multi searches for groups named [mysqldN] in my.cnf (or in the file named by the --defaults-file option). This number is referred to in the following discussion as the option group number, or GNR. Group numbers distinguish option groups from ... mysqld_multi is designed to manage several mysqld processes that listen for connections on different Unix socket files and TCP/IP ...
https://dev.mysql.com/doc/refman/5.7/en/cleartext-pluggable-authentication.html
Also, any program that uses libmysqlclient and reads option files can enable the plugin by including an enable-cleartext-plugin option in an option group read by the client library. A client-side authentication plugin is available that enables ...
https://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html
In other words, to be able to use an index, a prefix of the index must be used in every AND group. Understanding the B-tree and hash data structures can help predict how different queries perform on different storage engines that use these data ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-metrics-table.html
You can also perform these actions for a group of counters using their common module name. The INNODB_METRICS table provides a wide variety of InnoDB performance information, complementing the specific focus areas of the Performance Schema tables ...
https://dev.mysql.com/doc/refman/5.7/en/operator-precedence.html
Operator precedences are shown in the following list, from highest precedence to the lowest. Operators that are shown together on a line have the same precedence. When used as a comparison operator, it has the same precedence as <=>, >=, >, <=, <, ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-character.html
The GROUP BY and ORDER BY clauses can generate temporary tables, and these temporary tables can use the MEMORY storage engine if the original table does not contain any BLOB columns. For character and string columns, follow these guidelines: Use ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-file-summary-tables.html
Each file I/O summary table has one or more grouping columns to indicate how the table aggregates events. The Performance Schema maintains file I/O summary tables that aggregate information about I/O operations. Example file I/O event summary ...
https://dev.mysql.com/doc/refman/5.7/en/set.html
A table can have no more than 255 unique element list definitions among its ENUM and SET columns considered as a group. A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values ...
https://dev.mysql.com/doc/refman/5.7/en/sys-latest-file-io.html
These views summarize file I/O activity, grouped by file and thread. The latest_file_io and x$latest_file_io views have these columns: thread For foreground threads, the account associated with the thread (and port number for TCP/IP connections).