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https://dev.mysql.com/doc/refman/8.0/en/set-operations.html
A query block, sometimes also known as a simple table, is any SQL statement that returns a result set, such as SELECT. MySQL 8.0 (8.0.19 and later) also supports TABLE and VALUES statements. This is not supported in MySQL.) MySQL has long supported ... Result Set Column Names and Data Types Set Operations with TABLE and VALUES Statements Set Operations using DISTINCT and ALL Set Operations with ORDER BY and LIMIT Limitations of Set Operations SQL set operations combine the results of multiple query blocks into a single ...
https://dev.mysql.com/doc/refman/8.0/en/testing-server.html
This section assumes that your current location is the MySQL installation directory and that it has a bin subdirectory containing the MySQL programs used here. That enables your shell (command interpreter) to find MySQL programs properly, so that ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
row *************************** THREAD_ID: 1 NAME: thread/sql/main TYPE: BACKGROUND PROCESSLIST_ID: NULL PROCESSLIST_USER: NULL PROCESSLIST_HOST: NULL PROCESSLIST_DB: mysql PROCESSLIST_COMMAND: NULL PROCESSLIST_TIME: 418094 PROCESSLIST_STATE: NULL ...Each row contains information about a thread and indicates whether monitoring and historical event logging are enabled for it: mysql> SELECT * FROM performance_schema.threads\G *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-connection-compression.html
The default compression levels used by X Plugin from MySQL 8.0.20 have been selected through performance testing as being a good trade-off between compression time and network transit time. From MySQL 8.0.19, X Plugin supports compression of ...
https://dev.mysql.com/doc/refman/8.0/en/environment-variables.html
This section lists environment variables that are used directly or indirectly by MySQL. In many cases, it is preferable to use an option file instead of environment variables to modify the behavior of MySQL. HOME The default path for the mysql ...
https://dev.mysql.com/doc/refman/8.0/en/roles.html
To specify mandatory roles at server startup, define mandatory_roles in your server my.cnf file: [mysqld] mandatory_roles='role1,role2@localhost,r3@%.example.com' To set and persist mandatory_roles at runtime, use a statement like this: SET PERSIST ...The following list summarizes role-management capabilities provided by MySQL: CREATE ROLE and DROP ROLE create and remove ...
https://dev.mysql.com/doc/refman/8.0/en/proxy-users.html
At connect time, proxy_user must represent a valid externally authenticated MySQL user, and proxied_user must represent a valid locally authenticated user. For example, if a client authenticates through the ''@'' proxy account, this variable is set ...Requirements for Proxy User Support For proxying to occur for a given authentication plugin, these conditions must be satisfied: Proxying must be supported, either by the plugin itself, or by the MySQL server on behalf of the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
By default, MySQL starts the session for each new connection with autocommit enabled, so MySQL does a commit after each SQL statement if that statement did not return an error. If a session that has autocommit disabled ends without explicitly ...If ...
https://dev.mysql.com/doc/refman/8.0/en/show-warnings.html
mysql> CREATE TABLE t1 (a TINYINT NOT NULL, b CHAR(4)); Query OK, 0 rows affected (0.05 sec) mysql> INSERT INTO t1 VALUES(10,'mysql'), (NULL,'test'), (300,'xyz'); Query OK, 3 rows affected, 3 warnings (0.00 sec) Records: 3 Duplicates: 0 Warnings: 3 ... SHOW WARNINGS [LIMIT [offset,] row_count] SHOW COUNT(*) WARNINGS SHOW WARNINGS is a diagnostic statement that displays information about the conditions (errors, warnings, and notes) resulting from executing a statement in the current ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-options-system-variables.html
mysqlx_connect_timeout Command-Line Format --mysqlx-connect-timeout=# System Variable mysqlx_connect_timeout Scope Global Dynamic Yes SET_VAR Hint Applies No Type Integer Default Value 30 Minimum Value 1 Maximum Value 1000000000 Unit seconds The ...