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https://dev.mysql.com/doc/refman/8.0/en/set-operations.html
Result Set Column Names and Data Types Set Operations with TABLE and VALUES Statements Set Operations using DISTINCT and ALL Set Operations with ORDER BY and LIMIT Limitations of Set Operations SQL set operations combine the results of multiple ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-mysql-cluster.html
You must also remember to account for any column indexes as follows: Each primary key or hash index created for an NDBCLUSTER table requires 21−25 bytes per record. Creating NDB Cluster tables with USING HASH for all primary keys and unique ...Can ... In the following section, we answer questions that are frequently asked about MySQL NDB Cluster and the NDB storage ...
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 ...You can use this statement to verify that the contents are the same before and after a backup, ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-example-data.html
To specify this, use the ENGINE=NDBCLUSTER or ENGINE=NDB option when creating the table: CREATE TABLE tbl_name (col_name column_definitions) ENGINE=NDBCLUSTER; Alternatively, for an existing table that uses a different storage engine, use ALTER ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-transaction-tables.html
CREATE TABLE t2 (a INT) ENGINE = MyISAM; -- Transaction 1 COMMIT -- (implicit; DDL forces commit) 6. COMMIT; -- Transaction 2 COMMIT From the perspective of the server, Transaction 1 ends when table t2 is created. These tables store transaction ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-table-constraints-extensions-table.html
The TABLE_CONSTRAINTS_EXTENSIONS table (available as of MySQL 8.0.21) provides information about table constraint attributes defined for primary and secondary storage engines. The TABLE_CONSTRAINTS_EXTENSIONS table has these columns: ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-view-table-usage-table.html
The VIEW_TABLE_USAGE table (available as of MySQL 8.0.13) provides access to information about tables and views used in view definitions. You can see information only for views for which you have some privilege, and only for tables for which you ...
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/myisam-table-close.html
Each MyISAM index file (.MYI file) has a counter in the header that can be used to check whether a table has been closed properly. If you get the following warning from CHECK TABLE or myisamchk, it means that this counter has gone out of sync: ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-lock-waits-table.html
The data_lock_waits table implements a many-to-many relationship showing which data lock requests in the data_locks table are blocked by which held data locks in the data_locks table. The table exposes not only which lock a session or transaction ...Held locks in data_locks appear in data_lock_waits only if they block some lock ...