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https://dev.mysql.com/doc/refman/8.0/en/user-names.html
MySQL stores accounts in the user table of the mysql system database. For information about account representation in the user table, see Section 8.2.3, “Grant Tables”. Warning The MySQL user name length limit is hardcoded in MySQL servers and ...An account is defined in terms of a user name and the client host or hosts from which the user can connect to the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-benchmarking.html
Since changing the default storage engine only affects newly created tables, run your application installation and setup steps to confirm that everything installs properly, then exercise the application features to make sure the data loading, ...If ... If InnoDB is not the default storage engine, you can determine if your database server and applications work correctly with InnoDB by restarting the server with --default-storage-engine=InnoDB defined on the command line or with default-storage-engine=innodb defined in the [mysqld] section of the MySQL server option ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-diskio.html
For more information, refer to the following sections: Section 17.8.1, “InnoDB Startup Configuration” Section 17.6.1.2, “Creating Tables Externally” Creating a General Tablespace Section 17.6.1.4, “Moving or Copying InnoDB Tables” ... If ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-queries.html
To tune queries for InnoDB tables, create an appropriate set of indexes on each table. If you have many queries for the same table, testing different combinations of columns, try to create a small number of concatenated indexes rather than a large ...Follow these guidelines for InnoDB indexes: Because each InnoDB table has a primary key (whether you request one or not), specify a set of primary key columns for each table, columns that are used in the most important and time-critical ...
https://dev.mysql.com/doc/refman/8.0/en/scalar-subqueries.html
In MySQL 8.0.19 and later, the preceding query can also be written like this, using TABLE: SELECT (TABLE t2) FROM t1; A scalar subquery can be part of an expression, but remember the parentheses, even if the subquery is an operand that provides an ... In its simplest form, a subquery is a scalar subquery that returns a single ...
https://dev.mysql.com/doc/refman/8.0/en/option-files.html
Many option files are plain text files, created using any text editor. It is created by the server upon execution of SET PERSIST or SET PERSIST_ONLY statements. If an option file you want to use does not exist, create it using the appropriate ...
https://dev.mysql.com/doc/refman/8.0/en/signal.html
Signals can be raised within exception handlers: CREATE PROCEDURE p () BEGIN DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN SIGNAL SQLSTATE VALUE '99999' SET MESSAGE_TEXT = 'An error occurred'; END; DROP TABLE no_such_table; END; CALL p() reaches the ...Without SIGNAL, it is necessary to resort to workarounds such as deliberately referring to a nonexistent table to cause a routine to return an ...
https://dev.mysql.com/doc/refman/8.0/en/source-configuration-options.html
CMake Option Reference General Options Installation Layout Options Storage Engine Options Feature Options Compiler Flags CMake Options for Compiling NDB Cluster CMake Option Reference The following table shows the available CMake options. The CMake ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-invoked.html
The following statements are replicated using statement-based replication: CREATE EVENT ALTER EVENT DROP EVENT CREATE PROCEDURE DROP PROCEDURE CREATE FUNCTION DROP FUNCTION CREATE TRIGGER DROP TRIGGER However, the effects of features created, ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema.html
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data ...