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https://dev.mysql.com/doc/refman/8.0/en/sys-schema-usage.html
For additional information about the differences between non-x$ and x$ views, see Section 30.4.3, “sys Schema Views”. For example, to examine the definitions of the session view and format_bytes() function, use these statements: mysql> SHOW ...
https://dev.mysql.com/doc/refman/8.0/en/sys-sys-get-config.html
If sys_get_config() returns the default value and that value is NULL, it is expected that the caller is able to handle NULL for the given configuration option. By convention, routines that call sys_get_config() first check whether the corresponding ... Given a configuration option name, returns the option value from the sys_config table, or the provided default value (which may be NULL) if the option does not exist in the ...
https://dev.mysql.com/doc/refman/8.0/en/table-corruption.html
If you have started mysqld with the myisam_recover_options system variable set, MySQL automatically checks and tries to repair MyISAM tables if they are marked as 'not closed properly' or 'crashed'. If you get a lot of these errors, without mysqld ...If this happens, MySQL writes an entry in the hostname.err file 'Warning: Checking table ...' which is followed by Warning: Repairing table if the table needs to be ...
https://dev.mysql.com/doc/refman/8.0/en/table-scan-avoidance.html
This is common for tables with fewer than 10 rows and a short row length. You are comparing indexed columns with constant values and MySQL has calculated (based on the index tree) that the constants cover too large a part of the table and that a ...
https://dev.mysql.com/doc/refman/8.0/en/traceable-statements.html
Statements which are traceable are listed here: SELECT INSERT REPLACE UPDATE DELETE EXPLAIN with any of the preceding statements SET DO DECLARE, CASE, IF, and RETURN as used in stored routines CALL Tracing is supported for both INSERT and REPLACE ...For statements which are prepared and executed in separate steps, preparation and execution are traced ...
https://dev.mysql.com/doc/refman/8.0/en/triggers.html
A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. Some uses for triggers are to perform checks of values to be inserted into a table or to perform calculations on ...A trigger can be set to activate either before or after the trigger ...
https://dev.mysql.com/doc/refman/8.0/en/tutorial.html
mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program that enables you to connect to a MySQL server, run queries, and view the results. This chapter provides a tutorial introduction to MySQL by ...Because this chapter is tutorial in nature, many details are necessarily ...
https://dev.mysql.com/doc/refman/8.0/en/uninstall-plugin.html
The server executes the plugin's deinitialization function and removes the row for the plugin from the mysql.plugin system table, so that subsequent server restarts do not load and initialize the plugin. If you are uninstalling a plugin with no ...
https://dev.mysql.com/doc/refman/8.0/en/using-innodb-tables.html
For example, in a table containing information about people, you would not create a primary key on (firstname, lastname) because more than one person can have the same name, a name column may be left blank, and sometimes people change their names.
https://dev.mysql.com/doc/refman/8.0/en/version-tokens-elements.html
Version Tokens is based on a plugin library that implements these elements: A server-side plugin named version_tokens holds the list of version tokens associated with the server and subscribes to notifications for statement execution events. The ...