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https://dev.mysql.com/doc/refman/8.0/en/charset-collation-implementations.html
MySQL implements several types of collations: Simple collations for 8-bit character sets This kind of collation is implemented using an array of 256 weights that defines a one-to-one mapping from character codes to weights. It is a case-insensitive ...
https://dev.mysql.com/doc/refman/8.0/en/charset-repertoire.html
The repertoire of a character set is the collection of characters in the set. String expressions have a repertoire attribute, which can have two values: ASCII: The expression can contain only ASCII characters; that is, characters in the Unicode ...
https://dev.mysql.com/doc/refman/8.0/en/charset-table.html
The CREATE TABLE and ALTER TABLE statements have optional clauses for specifying the table character set and collation: CREATE TABLE tbl_name (column_list) [[DEFAULT] CHARACTER SET charset_name] [COLLATE collation_name]] ALTER TABLE tbl_name ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-conversion.html
Tables created with these row formats enable you to index a maximum of 1024 or 768 characters for utf8mb3 or utf8mb4 columns, respectively. The older server sees utf8 in the dump file object definitions and create new objects that use the (3-byte) ... This section describes issues that you may face when converting character data between the utf8mb3 and utf8mb4 character ...
https://dev.mysql.com/doc/refman/8.0/en/checksum-table.html
This row-by-row calculation is what you get with the EXTENDED clause, with InnoDB and all other storage engines other than MyISAM, and with MyISAM tables not created with the CHECKSUM=1 clause. For MyISAM tables created with the CHECKSUM=1 clause, ...[QUICK | EXTENDED] CHECKSUM TABLE reports a checksum for the contents of a ...
https://dev.mysql.com/doc/refman/8.0/en/clone-plugin-local.html
The MySQL server must have the necessary write access to create the directory. Note A local cloning operation does not support cloning of user-created tables or tablespaces that reside outside of the data directory. All other user-created InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/constraint-foreign-key.html
MySQL supports ON UPDATE and ON DELETE foreign key references in CREATE TABLE and ALTER TABLE statements. MySQL requires that foreign key columns be indexed; if you create a table with a foreign key constraint but no index on a given column, an ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-schema.html
If an upgrade is necessary and supported, the server creates data dictionary tables with updated definitions, copies persisted metadata to the new tables, atomically replaces the old tables with the new ones, and reinitializes the data dictionary.
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that does not have a data dictionary: Previously, enabling the innodb_read_only system variable prevented creating and dropping tables only for ...As of MySQL 8.0, enabling innodb_read_only prevents these operations for all storage ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-components.html
Provides a parser for reading error log files created by previous server instances. Provides a parser for reading error log files created by previous server instances. Does not provide a parser for reading error log files created by previous server ... This section describes the characteristics of individual error log ...