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https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-background.html
The compressed page size is specified through the CREATE TABLE or ALTER TABLE KEY_BLOCK_SIZE parameter. Specify a value that is too small, and the CREATE TABLE or ALTER TABLE statement fails. An InnoDB table created with ROW_FORMAT=COMPRESSED can ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning.html
Section 22.3, “Partition Management”, covers methods of adding, removing, and altering partitions in existing partitioned tables. Note As of MySQL 5.7.17, the generic partitioning handler in the MySQL server is deprecated, and is removed in ...
https://dev.mysql.com/doc/refman/5.7/en/view-restrictions.html
CHECK TABLE can be used to check for views that have been invalidated by DROP or ALTER operations. The maximum number of tables that can be referenced in the definition of a view is 61. However, a view that is processed with the temptable algorithm ...View processing is not optimized: It is not possible to create an index on a ...
https://dev.mysql.com/doc/refman/5.7/en/connection-access.html
The server performs identity and credentials checking using columns in the user table, accepting the connection only if these conditions are satisfied: The client host name and user name match the Host and User columns in some user table row. When ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-schemata-table.html
A schema is a database, so the SCHEMATA table provides information about databases. The SCHEMATA table has these columns: CATALOG_NAME The name of the catalog to which the schema belongs. Caution Because a global privilege is considered a privilege ...The following statements are equivalent: SELECT SCHEMA_NAME AS `Database` FROM INFORMATION_SCHEMA.SCHEMATA [WHERE SCHEMA_NAME LIKE 'wild'] SHOW DATABASES [LIKE 'wild'] You see only those databases for which you have some kind of privilege, unless you have the global SHOW DATABASES ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-multi-tables.html
Some techniques for keeping individual queries fast involve splitting data across many tables. When the number of tables runs into the thousands or even millions, the overhead of dealing with all these tables becomes a new performance consideration.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-instance-tables.html
They provide event names and explanatory notes or status information: cond_instances: Condition synchronization object instances file_instances: File instances mutex_instances: Mutex synchronization object instances rwlock_instances: Lock ...There ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-lock-tables.html
The Performance Schema exposes lock information through these tables: metadata_locks: Metadata locks held and requested table_handles: Table locks held and requested The following sections describe these tables in more detail.
https://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl-single-multi.html
Before the introduction of online DDL, it was common practice to combine many DDL operations into a single ALTER TABLE statement. Because each ALTER TABLE statement involved copying and rebuilding the table, it was more efficient to make several ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create-connection.html
To use the first method, you must specify the CONNECTION string after the engine type in a CREATE TABLE statement. For example: CREATE TABLE federated_table ( id INT(20) NOT NULL AUTO_INCREMENT, name VARCHAR(32) NOT NULL DEFAULT '', other INT(20) ...The format of the connection string is as follows: scheme://user_name[:password]@host_name[:port_num]/db_name/tbl_name Where: scheme: A recognized connection ...