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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. The processlist table contains a row for each server process: mysql> SELECT * FROM performance_schema.processlist\G ...For ...
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
Explicit Default Handling as of MySQL 8.0.13 Explicit Default Handling Prior to MySQL 8.0.13 Implicit Default Handling Explicit Default Handling as of MySQL 8.0.13 The default value specified in a DEFAULT clause can be a literal constant or an ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-fulltext-index.html
mysql> SELECT index_id, name, table_id, space from INFORMATION_SCHEMA.INNODB_INDEXES WHERE index_id=457; +----------+------+----------+-------+ | index_id | name | table_id | space | +----------+------+----------+-------+ | 457 | idx | 327 | 283 | ... Full-text indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to speed up queries and DML operations on data contained within those ...
https://dev.mysql.com/doc/refman/8.0/en/persisted-system-variables.html
qualifier: SET PERSIST max_connections = 1000; SET @@PERSIST.max_connections = 1000; Like SET GLOBAL, SET PERSIST sets the global variable runtime value, but also writes the variable setting to the mysqld-auto.cnf file (replacing any existing ...A ...
https://dev.mysql.com/doc/refman/8.0/en/create-event.html
The DEFINER clause specifies the MySQL account to be used when checking access privileges at event execution time. The ENDS keyword is followed by a timestamp value that tells MySQL when the event should stop repeating. The ON SCHEDULE clause may ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-file-reading.html
The start item has this format, where value is a literal timestamp value: "start": { "timestamp": "value" } The start item is permitted as of MySQL 8.0.22. Suppose that a call to obtain a bookmark produces this value: mysql> SET @mark := ...The ...
https://dev.mysql.com/doc/refman/8.0/en/order-by-optimization.html
This section describes when MySQL can use an index to satisfy an ORDER BY clause, the filesort operation used when an index cannot be used, and execution plan information available from the optimizer about ORDER BY. (The resulting sort order may be ...An ORDER BY with and without LIMIT may return rows in different orders, as discussed in Section 10.2.1.19, “LIMIT Query ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-bootstrap.html
The process of starting a group for the first time is called bootstrapping. mysql> CREATE DATABASE test; mysql> USE test; mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT NOT NULL); mysql> INSERT INTO t1 VALUES (1, 'Luis'); Check the content of ...The bootstrap should only be done by a single server, the one that starts the group and only ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-component-installation.html
Note Only one keyring component or plugin should be enabled at a time. MySQL provides these keyring component choices: component_keyring_file: Stores keyring data in a file local to the server host. To be usable by the server, the component library ... Keyring service consumers require that a keyring component or plugin be installed: To use a keyring component, begin with the instructions ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-repair.html
On Unix, make sure that they are readable by the user that mysqld runs as (and to you, because you need to access the files you are checking). If you are going to repair a table from the command line, you must first stop the mysqld server. Note that ... The discussion in this section describes how to use myisamchk on MyISAM tables (extensions .MYI and ...