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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-upgrade-downgrade.html
In many cases, mysqld cannot open tables that were created or modified by a later version of MySQL. Do not use ALTER TABLE on any existing NDB tables; do not create any new NDB tables which cannot be safely dropped prior to downgrading. After ...In ... Versions Supported for Upgrade to NDB 8.0 Reverting an NDB Cluster 8.0 Upgrade Known Issues When Upgrading or Downgrading NDB Cluster This section provides information about NDB Cluster software and compatibility between different NDB Cluster 8.0 releases with regard to performing upgrades and ...
https://dev.mysql.com/doc/refman/8.0/en/plugin-loading.html
For example, if the plugin implements a storage engine, existing tables for the storage engine become inaccessible, and attempts to create new tables for the storage engine result in tables that use the default storage engine unless the ...Built-in ... Server plugins must be loaded into the server before they can be ...
https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
CREATE TABLE t1 ( ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, dt DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ); With a DEFAULT clause but no ON UPDATE CURRENT_TIMESTAMP clause, the column has the given ...
https://dev.mysql.com/doc/refman/8.0/en/nested-join-optimization.html
The syntax of table_factor is extended in comparison with the SQL Standard. The latter accepts only table_reference, not a list of them inside a pair of parentheses. This is a conservative extension if we consider each comma in a list of ...The ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-list.html
For more detailed syntactical information, see Section 15.1.20, “CREATE TABLE Statement”. As with the other partitioning examples, we assume that the default_storage_engine is InnoDB.) Suppose that there are 20 video stores distributed among 4 ... List partitioning in MySQL is similar to range partitioning in many ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rbr-usage.html
In addition, because temporary tables can be read only from the thread which created them, there is seldom if ever any benefit obtained from replicating them, even when using statement-based format. You can switch from statement-based to row-based ...As noted in Section 19.5.1.31, “Replication and Temporary Tables”, temporary tables are not replicated when using row-based format or (from MySQL 8.0.4) mixed ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlock-example.html
Client A enables innodb_print_all_deadlocks, creates two tables, 'Animals' and 'Birds', and inserts data into each. The following example illustrates how an error can occur when a lock request causes a deadlock. Thererfore, the previous read-only ...
https://dev.mysql.com/doc/refman/8.0/en/federated-description.html
When you create a table using one of the standard storage engines (such as MyISAM, CSV or InnoDB), the table consists of the table definition and the associated data. When you create a FEDERATED table, the table definition is the same, but the ...A ...The statement is sent to the remote server using the MySQL client ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
Creation of a table of type MERGE does not check whether the underlying tables are compatible types. Even if you use lower_case_table_names=2 (which enables MySQL to remember the case used for databases and table names), MySQL does not remember the ... This section lists known issues in recent versions of ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-diffengines.html
Configuring different engines on the source and replica depends on how you set up the initial replication process: If you used mysqldump to create the database snapshot on your source, you could edit the dump file text to change the engine type used ... It does not matter for the replication process whether the original table on the source and the replicated table on the replica use different storage engine ...