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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$latest_file_io views have these columns: thread For foreground threads, the account associated with the thread (and port number for TCP/IP connections).
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-usage.html
Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix that displays the same values in raw form is intended more for use with other tools that perform ...
https://dev.mysql.com/doc/refman/5.7/en/server-options.html
mysqld_safe reads options from the [mysqld], [server], [mysqld_safe], and [safe_mysqld] groups. An embedded MySQL server usually reads options from the [server], [embedded], and [xxxxx_SERVER] groups, where xxxxx is the name of the application into ... When you start the mysqld server, you can specify program options using any of the methods described in Section 4.2.2, “Specifying Program ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-information-schema-tables.html
They provide information about thread pool operation: TP_THREAD_GROUP_STATE: Information about thread pool thread group states TP_THREAD_GROUP_STATS: Thread group statistics TP_THREAD_STATE: Information about thread pool thread states Rows in these ... The following sections describe the INFORMATION_SCHEMA tables associated with the thread pool plugin (see Section 5.5.3, “MySQL Enterprise Thread ...
https://dev.mysql.com/doc/refman/5.7/en/adding-collation-simple-8bit.html
This section describes how to add a simple collation for an 8-bit character set by writing the <collation> elements associated with a <charset> character set description in the MySQL Index.xml file. The example adds a collation named latin1_test_ci ...
https://dev.mysql.com/doc/refman/5.7/en/alter-database.html
ALTER {DATABASE | SCHEMA} db_name UPGRADE DATA DIRECTORY NAME alter_option: { [DEFAULT] CHARACTER SET [=] charset_name | [DEFAULT] COLLATE [=] collation_name } ALTER DATABASE enables you to change the overall characteristics of a database. These ...
https://dev.mysql.com/doc/refman/5.7/en/alter-procedure.html
ALTER PROCEDURE proc_name [characteristic ...] characteristic: { COMMENT 'string' | LANGUAGE SQL | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA } | SQL SECURITY { DEFINER | INVOKER } } This statement can be used to change the ...