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https://dev.mysql.com/doc/refman/8.0/en/invisible-columns.html
However, even if explicitly referenced, a column that is invisible in the existing table is visible in the new table: mysql> CREATE TABLE t1 (col1 INT, col2 INT INVISIBLE); mysql> CREATE TABLE t2 AS SELECT col1, col2 FROM t1; mysql> SHOW CREATE ...
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/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. It may occur for temporary tables created outside stored functions ...
https://dev.mysql.com/doc/refman/8.0/en/drop-table.html
A TEMPORARY table is visible only with the session that created it, so no check is necessary. Be careful with this statement! For each table, it removes the table definition and all table data. If the table is partitioned, the statement removes the ...They are permitted to make porting easier from other database ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-internals.html
The cache_policies table, config_options table, and containers table are created by the innodb_memcached_config.sql configuration script in the innodb_memcache database. The containers table contains a default entry for the test.demo_test table, ...
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/myisampack.html
(myisampack creates an intermediate file named tbl_name.TMD in the database directory while it compresses the table. When the table is used later, the server reads into memory the information needed to decompress columns. MySQL uses mmap() when ...
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/information-schema-table-privileges-table.html
The TABLE_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the table belongs. TABLE_SCHEMA The name of the schema ...The output does not list GRANT OPTION as a separate row with PRIVILEGE_TYPE='GRANT ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
However, prefix lengths for index specifications in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements are interpreted as number of characters for nonbinary string types (CHAR, VARCHAR, TEXT) and number of bytes for binary string types (BINARY, ...The information_schema_stats_expiry system variable defines the period of time before cached table statistics ...