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https://dev.mysql.com/doc/refman/8.0/en/can-not-connect-to-server.html
If you get the error message Can't connect to MySQL server on some_host, you can try the following things to find out what the problem is: Check whether the server is running on that host by executing telnet some_host 3306 and pressing the Enter key ... A MySQL client on Unix can connect to the mysqld server in two different ways: By using a Unix socket file to connect through a file in the file system (default /tmp/mysql.sock), or by using TCP/IP, which connects through a port ...
https://dev.mysql.com/doc/refman/8.0/en/char.html
For those cases where trailing pad characters are stripped or comparisons ignore them, if a column has an index that requires unique values, inserting into the column values that differ only in number of trailing pad characters results in a ... The ...
https://dev.mysql.com/doc/refman/8.0/en/charset-errors.html
This section describes how the MySQL server uses character sets for constructing error messages. For information about the language of error messages (rather than the character set), see Section 12.12, “Setting the Error Message Language”. For ...
https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html
Functional key parts (see Section 15.1.15, “CREATE INDEX Statement”) are implemented as hidden virtual generated stored columns, so each functional key part in a table index counts against the table total column limit. This section describes ...
https://dev.mysql.com/doc/refman/8.0/en/connecting.html
For information on establishing connections using URI-like connection strings or key-value pairs, for clients such as MySQL Shell, see Section 6.2.5, “Connecting to the Server Using URI-Like Strings or Key-Value Pairs”. This section describes ...
https://dev.mysql.com/doc/refman/8.0/en/data-directory.html
Information managed by the MySQL server is stored under a directory known as the data directory. The following list briefly describes the items typically found in the data directory, with cross references for additional information: Data directory ...
https://dev.mysql.com/doc/refman/8.0/en/delete.html
For MyISAM tables, you can specify an AUTO_INCREMENT secondary column in a multiple-column key. If you use a multiple-table DELETE statement involving InnoDB tables for which there are foreign key constraints, the MySQL optimizer might process ...
https://dev.mysql.com/doc/refman/8.0/en/end-markers-in-json-system-variable.html
When reading a very large JSON document, it can be difficult to pair its closing bracket and opening brackets; setting end_markers_in_json=ON repeats the structure's key, if it has one, near the closing bracket. Note If end_markers_in_json is ...
https://dev.mysql.com/doc/refman/8.0/en/enterprise-encryption.html
Note MySQL Enterprise Encryption is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition includes a set of encryption functions that expose OpenSSL capabilities at the SQL level. From MySQL 8.0.30, they ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-format.html
log_sink_json Output Format The JSON-format log sink produces messages as JSON objects that contain key-value pairs. The ts (timestamp) key was added in MySQL 8.0.20 and is unique to the JSON-format log sink. Each error log sink (writer) component ...