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https://dev.mysql.com/doc/refman/5.7/en/creating-many-tables.html
If you have many MyISAM tables in the same database directory, open, close, and create operations are slow. If you execute SELECT statements on many different tables, there is a little overhead when the table cache is full, because for every table ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-engines-table.html
The ENGINES table has these columns: ENGINE The name of the storage engine. SUPPORT The server's level of support for the storage engine, as shown in the following table. This is particularly useful for checking whether a storage engine is ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-plugins-table.html
The PLUGINS table has these columns: PLUGIN_NAME The name used to refer to the plugin in statements such as INSTALL PLUGIN and UNINSTALL PLUGIN. For plugins installed with INSTALL PLUGIN, the PLUGIN_NAME and PLUGIN_LIBRARY values are also registered ...PLUGIN_STATUS The plugin status, one of ACTIVE, INACTIVE, DISABLED, or ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-profiling-table.html
The table is empty unless the profiling session variable is set to 1. Note This table is deprecated; expect it to be removed in a future release of MySQL. The PROFILING table has these columns: QUERY_ID A numeric statement identifier. Its contents ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-referential-constraints-table.html
The REFERENTIAL_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The name of the catalog to which the constraint belongs. CONSTRAINT_SCHEMA The name of the schema (database) to which the constraint belongs. UNIQUE_CONSTRAINT_CATALOG The name ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-views-table.html
You must have the SHOW VIEW privilege to access this table. The VIEWS table has these columns: TABLE_CATALOG The name of the catalog to which the view belongs. TABLE_SCHEMA The name of the schema (database) to which the view belongs. This column has ...VIEW_DEFINITION The SELECT statement that provides the definition of the ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-table-compression.html
This section describes InnoDB table compression, which is supported with InnoDB tables that reside in file_per_table tablespaces or general tablespaces. Table compression is enabled using the ROW_FORMAT=COMPRESSED attribute with CREATE TABLE or ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-information-schema-tables.html
Two INFORMATION_SCHEMA tables provide information that is of particular use when managing an NDB Cluster . The FILES table provides information about NDB Cluster Disk Data files. The ndb_transid_mysql_connection_map table provides a mapping between ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-file-instances-table.html
The file_instances table lists all the files seen by the Performance Schema when executing file I/O instrumentation. When a file is deleted from the disk, it is also removed from the file_instances table. If a file on disk has never been opened, it ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-rwlock-instances-table.html
The rwlock_instances table lists all the rwlock (read write lock) instances seen by the Performance Schema while the server executes. The rwlock_instances table has these columns: NAME The instrument name associated with the lock. An rwlock is a ...