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https://dev.mysql.com/doc/refman/8.0/en/information-functions.html
This applies to statements such as UPDATE, INSERT, or DELETE (as before), but now also to statements such as ALTER TABLE and LOAD DATA. For example, BENCHMARK(10, (SELECT * FROM t)) fails if the table t has more than one column or more than one row.
https://dev.mysql.com/doc/refman/8.0/en/data-size.html
To use a row format other than DYNAMIC, configure innodb_default_row_format, or specify the ROW_FORMAT option explicitly in a CREATE TABLE or ALTER TABLE statement. Design your tables to minimize their space on the disk. Smaller tables normally ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-issues.html
This can be done by issuing a statement such as ALTER TABLE mysql.ndb_apply_status ENGINE=MyISAM on the replica. In the event of a node failure, errors in replication of NDB tables without primary keys can still occur, due to the possibility of ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM ...INNODB_BUFFER_PAGE_LRU: Holds information about the pages in the InnoDB buffer pool, in particular how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-transaction-tables.html
These tables store transaction events: events_transactions_current: The current transaction event for each thread. There are also summary tables that aggregate information about transaction events; see Section 29.12.20.5, “Transaction Summary ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-handling-nulls.html
DROP PARTITION, see Section 15.1.9, “ALTER TABLE Statement”.) NULL is also treated in this way for partitioning expressions that use SQL functions. If you insert a row into a table partitioned by RANGE such that the column value used to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-examples.html
Note This section describes locking information as exposed by the Performance Schema data_locks and data_lock_waits tables, which supersede the INFORMATION_SCHEMA INNODB_LOCKS and INNODB_LOCK_WAITS tables in MySQL 8.0. For similar discussion ...
https://dev.mysql.com/doc/refman/8.0/en/switchable-optimizations.html
For more information, see Section 10.2.2.5, “Derived Condition Pushdown Optimization” Derived Table Merging Flags derived_merge (default on) Controls merging of derived tables and views into outer query block. The derived_merge flag controls ...
https://dev.mysql.com/doc/refman/8.0/en/tracing-example.html
Next, for every table in the query, we estimate the cost of, and number of records returned by, a table scan or a range access. "resulting_clause_is_simple": true, "resulting_clause": "`test`.`alias1`.`col_int_key`" } /* clause_processing */ }, The ...Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/view-updatability.html
Some views are updatable and references to them can be used to specify tables to be updated in data change statements. That is, you can use them in statements such as UPDATE, DELETE, or INSERT to update the contents of the underlying table. Derived ...For dependent subqueries in the select list, no data change statements are ...