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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-instrument-filtering.html
The setup_instruments table lists the available instruments: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; +---------------------------------------------------+---------+-------+ | NAME | ENABLED | TIMED | ...| ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-startup-configuration.html
Consumer names in the setup_consumers table use underscores, but for consumers set at startup, dashes and underscores within the name are equivalent. The other variables indicate table sizes (number of rows) or memory allocation values. For example, ... To use the MySQL Performance Schema, it must be enabled at server startup to enable event collection to ...
https://dev.mysql.com/doc/refman/8.4/en/primary-key-optimization.html
The primary key for a table represents the column or set of columns that you use in your most vital queries. With the InnoDB storage engine, the table data is physically organized to do ultra-fast lookups and sorts based on the primary key column ...Query performance benefits from the NOT NULL optimization, because it cannot include any NULL ...
https://dev.mysql.com/doc/refman/8.4/en/replication-administration-skip.html
Details of the error and the last successfully applied transaction are recorded in the Performance Schema table replication_applier_status_by_worker. This method of skipping transactions is not suitable when you have enabled GTID assignment on a ...
https://dev.mysql.com/doc/refman/8.4/en/resetting-permissions.html
Alternatively, on any platform, you can reset the password using the mysql client (but this approach is less secure): Stop the MySQL server if necessary, then restart it with the --skip-grant-tables option. Because this is insecure, if the server is ... If you have never assigned a root password for MySQL, the server does not require a password at all for connecting as ...
https://dev.mysql.com/doc/refman/8.4/en/session-state-tracking.html
A client can enable these trackers to receive notification of changes to its session state. Uses for Session State Trackers Available Session State Trackers C API Session State Tracker Support Test Suite Session State Tracker Support Uses for ...
https://dev.mysql.com/doc/refman/8.4/en/set.html
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 specified when the table is created. Trailing spaces are automatically deleted from SET member values in the table definition ...SET column values that consist of multiple set members are specified with members separated by commas ...
https://dev.mysql.com/doc/refman/8.4/en/socket-pluggable-authentication.html
Alternatively, to load the plugin at runtime, use this statement: INSTALL PLUGIN auth_socket SONAME 'auth_socket.so'; INSTALL PLUGIN loads the plugin immediately, and also registers it in the mysql.plugins system table to cause the server to load it ... The server-side auth_socket authentication plugin authenticates clients that connect from the local host through the Unix socket ...
https://dev.mysql.com/doc/refman/8.4/en/string-comparison-functions.html
Table 14.13 String Comparison Functions and Operators Name Description LIKE Simple pattern matching NOT LIKE Negation of simple pattern matching STRCMP() Compare two strings If a string function is given a binary string as an argument, the ...A ...
https://dev.mysql.com/doc/refman/8.4/en/sys-diagnostics.html
Configuration Options diagnostics() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 30.4.2.1, “The sys_config Table”): debug, @sys.debug If this option is ON, produce ... Creates a report of the current server status for diagnostic ...