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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/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 ...
https://dev.mysql.com/doc/refman/5.7/en/alter-table-generated-columns.html
ALTER TABLE operations permitted for generated columns are ADD, MODIFY, and CHANGE. CREATE TABLE t1 (c1 INT); ALTER TABLE t1 ADD COLUMN c2 INT GENERATED ALWAYS AS (c1 + 1) STORED; The data type and expression of generated columns can be modified.
https://dev.mysql.com/doc/refman/5.7/en/batch-mode.html
In the previous sections, you used mysql interactively to enter statements and view the results. If you want the script to continue even if some of the statements in it produce errors, you should use the --force command-line option. Why use a ...
https://dev.mysql.com/doc/refman/5.7/en/begin-end.html
END syntax is used for writing compound statements, which can appear within stored programs (stored procedures and functions, triggers, and events). A compound statement can contain multiple statements, enclosed by the BEGIN and END keywords.