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https://dev.mysql.com/doc/refman/5.7/en/charset-unicode.html
Table 10.2, “Unicode Character Set General Characteristics”, summarizes the general characteristics of Unicode character sets supported by MySQL. That section also describes how to convert tables from the (3-byte) utf8mb3 to the (4-byte) ... The ...
https://dev.mysql.com/doc/refman/5.7/en/connection-control-plugin.html
CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS implements an INFORMATION_SCHEMA table that exposes more detailed monitoring information for failed connection attempts. For more information about this table, see Section 24.6.2, “The INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/5.7/en/constraints.html
MySQL enables you to work both with transactional tables that permit rollback and with nontransactional tables that do not. We must handle the case when you have inserted or updated a lot of rows in a nontransactional table for which changes cannot ...Because of this, constraint handling is a bit different in MySQL than in other ...
https://dev.mysql.com/doc/refman/5.7/en/counting-rows.html
Counting the total number of animals you have is the same question as “How many rows are in the pet table?” because there is one record per pet. COUNT(*) counts the number of rows, so the query to count your animals looks like this: mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/create-database.html
CREATE DATABASE is not permitted within a session that has an active LOCK TABLES statement. A database in MySQL is implemented as a directory containing files that correspond to tables in the database. Because there are no tables in a database when ... CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name [create_option] ...
https://dev.mysql.com/doc/refman/5.7/en/create-logfile-group.html
For example, you cannot have a tablespace and a log file group with the same name, or a tablespace and a data file with the same name. You can verify that the UNDO files were created and obtain information about them by querying the Information ...
https://dev.mysql.com/doc/refman/5.7/en/debugging-server.html
This command also provides some useful information even if you have not compiled MySQL for debugging! If the problem is that some tables are getting slower and slower you should try to optimize the table with OPTIMIZE TABLE or myisamchk. If you are ...
https://dev.mysql.com/doc/refman/5.7/en/declare-handler.html
It can take the following forms: mysql_error_code: An integer literal indicating a MySQL error code, such as 1051 to specify “unknown table”: DECLARE CONTINUE HANDLER FOR 1051 BEGIN -- body of handler END; Do not use MySQL error code 0 because ...statement handler_action: { CONTINUE | EXIT | UNDO } condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION } The DECLARE ...
https://dev.mysql.com/doc/refman/5.7/en/differences-from-ansi.html
For example, in MySQL, privileges for a table are not automatically revoked when you delete a table. You must explicitly issue a REVOKE statement to revoke privileges for a table. We try to make MySQL Server follow the ANSI SQL standard and the ...
https://dev.mysql.com/doc/refman/5.7/en/distinct-optimization.html
DISTINCT combined with ORDER BY needs a temporary table in many cases. If you do not use columns from all tables named in a query, MySQL stops scanning any unused tables as soon as it finds the first match. Because DISTINCT may use GROUP BY, learn ...