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https://dev.mysql.com/doc/refman/8.0/en/scalar-subqueries.html
A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those characteristics that all operands have: a data type, a length, an indication that it can be ...
https://dev.mysql.com/doc/refman/8.0/en/security.html
Ensure that you have adequate and appropriate backups of your database files, configuration and log files. Also be sure that you have a recovery solution in place and test that you are able to successfully recover the information from your backups.
https://dev.mysql.com/doc/refman/8.0/en/select-into.html
The file is created on the server host, so you must have the FILE privilege to use this syntax. (You should never run mysqld as root for this and other reasons.) As of MySQL 8.0.17, the umask for file creation is 0640; you must have sufficient ...
https://dev.mysql.com/doc/refman/8.0/en/select-optimization.html
Those statements have additional performance considerations because they combine write operations with the read-oriented query operations. Both InnoDB and MyISAM have sets of guidelines for enabling and sustaining high performance in queries.
https://dev.mysql.com/doc/refman/8.0/en/set-variable.html
A system variable can have a global value that affects server operation as a whole, a session value that affects the current session, or both. variable: { user_var_name | param_name | local_var_name | {GLOBAL | @@GLOBAL.} system_var_name | {PERSIST ...
https://dev.mysql.com/doc/refman/8.0/en/sha256-pluggable-authentication.html
The database administrator must set these variables at server startup if the key files to use have names that differ from the system variable default values. After the server has been configured with the RSA key files, accounts that authenticate ...
https://dev.mysql.com/doc/refman/8.0/en/show-relaylog-events.html
Note Issuing a SHOW RELAYLOG EVENTS with no LIMIT clause could start a very time- and resource-consuming process because the server returns to the client the complete contents of the relay log (including all statements modifying data that have been ... SHOW RELAYLOG EVENTS [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count] [channel_option] channel_option: FOR CHANNEL channel Shows the events in the relay log of a ...
https://dev.mysql.com/doc/refman/8.0/en/show-tables.html
These temporary tables have names beginning with #sql and can be dropped using DROP TABLE. If you have no privileges for a base table or view, it does not show up in the output from SHOW TABLES or mysqlshow db_name. SHOW [EXTENDED] [FULL] TABLES ...
https://dev.mysql.com/doc/refman/8.0/en/signal.html
Effect of Signals on Handlers, Cursors, and Statements Signals have different effects on statement execution depending on the signal class. The statement thus clears any warnings that may have been present there (and resets warning_count to 0).
https://dev.mysql.com/doc/refman/8.0/en/source-installation-prerequisites.html
If you encounter build errors such as internal compiler error when compiling large source files, it may be that you have too little memory. Note If you have to install any programs, modify your PATH environment variable to include any directories in ...Some of these tools are needed no matter whether you use a standard source distribution or a development source ...