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https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html
The size penalty for storing the hex string in a CHAR column is at least two times, up to eight times if the value is stored in a column that uses the utf8mb4 character set (where each character uses 4 bytes). If you want to store these results, use ...
https://dev.mysql.com/doc/refman/8.0/en/extended-show.html
Some extensions to SHOW statements accompany the implementation of INFORMATION_SCHEMA: SHOW can be used to get information about the structure of INFORMATION_SCHEMA itself. Several SHOW statements accept a WHERE clause that provides more ...
https://dev.mysql.com/doc/refman/8.0/en/extensions-to-ansi.html
String comparisons are case-insensitive by default, with sort ordering determined by the collation of the current character set, which is utf8mb4 by default. MySQL Server supports some extensions that you are not likely to find in other SQL DBMSs.
https://dev.mysql.com/doc/refman/8.0/en/federated-create-connection.html
For example: CREATE TABLE federated_table ( id INT(20) NOT NULL AUTO_INCREMENT, name VARCHAR(32) NOT NULL DEFAULT '', other INT(20) NOT NULL DEFAULT '0', PRIMARY KEY (id), INDEX name (name), INDEX other_key (other) ) ENGINE=FEDERATED DEFAULT ... To ...
https://dev.mysql.com/doc/refman/8.0/en/federated-create-server.html
If you are creating a number of FEDERATED tables on the same server, or if you want to simplify the process of creating FEDERATED tables, you can use the CREATE SERVER statement to define the server connection parameters, just as you would with the ...
https://dev.mysql.com/doc/refman/8.0/en/federated-create.html
To create a FEDERATED table you should follow these steps: Create the table on the remote server. Alternatively, make a note of the table definition of an existing table, perhaps using the SHOW CREATE TABLE statement. Create the table on the local ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html
For example, a column that uses the utf8mb4 character set of can be assigned a collation of utf8mb4_0900_as_cs or utf8mb4_bin to make it case-sensitive for full-text searches. By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() ...
https://dev.mysql.com/doc/refman/8.0/en/glossary.html
For example, a CHAR(255) column can exceed 768 bytes if the maximum byte length of the character set is greater than 3, as it is with utf8mb4. These terms are commonly used in information about the MySQL database server. Files with this extension ...
https://dev.mysql.com/doc/refman/8.0/en/index-page-merge-threshold.html
row *************************** Table: t2 Create Table: CREATE TABLE `t2` ( `id` int(11) DEFAULT NULL, KEY `id_index` (`id`) COMMENT 'MERGE_THRESHOLD=40' ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci Note A MERGE_THRESHOLD value ...If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE operation, InnoDB attempts to merge the index page with a neighboring index ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html
For example, if you say SHOW FULL COLUMNS FROM t, and you see in the COLLATION_NAME column a value of utf8mb4_swedish_ci, the character set is what appears before the first underscore: utf8mb4. The related ST_GEOMETRY_COLUMNS table provides ...