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https://dev.mysql.com/doc/refman/8.4/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/8.4/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/8.4/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/8.4/en/drop-function-loadable.html
(DROP FUNCTION is also used to drop stored functions; see Section 15.1.29, “DROP PROCEDURE and DROP FUNCTION Statements”.) DROP FUNCTION is the complement of CREATE FUNCTION. DROP FUNCTION also removes the function from the Performance Schema ...
https://dev.mysql.com/doc/refman/8.4/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 ...
https://dev.mysql.com/doc/refman/8.4/en/example-storage-engine.html
The EXAMPLE storage engine is a stub engine that does nothing. Its purpose is to serve as an example in the MySQL source code that illustrates how to begin writing new storage engines. To enable the EXAMPLE storage engine if you build MySQL from ...
https://dev.mysql.com/doc/refman/8.4/en/fractional-seconds.html
For example: CREATE TABLE t1 (t TIME(3), dt DATETIME(6)); The fsp value, if given, must be in the range 0 to 6. MySQL has fractional seconds support for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision: To define a ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-boolean.html
The minimum and maximum word length full-text parameters apply to FULLTEXT indexes created using the built-in FULLTEXT parser and MeCab parser plugin. Minimum and maximum word length full-text parameters do not apply to FULLTEXT indexes created ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-buffer-pool-stats-table.html
PAGES_CREATE_RATE The number of pages created per second (pages created since the last printout / time elapsed). The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. Much ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-indexes-table.html
Most indexes created implicitly by InnoDB have consistent names but the index names are not necessarily unique. For GEN_CLUST_INDEX indexes, this value is 0 because the index is created using an artificial value rather than a real table column. Any ...For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object ...