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https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-disk-data-objects.html
NDB Cluster Disk Data storage is implemented using the following objects: Tablespace: Acts as containers for other Disk Data objects. A tablespace contains one or more data files and one or more undo log file groups. Undo log file: Contains undo ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-online-add-node-example.html
In this section we provide a detailed example illustrating how to add new NDB Cluster data nodes online, starting with an NDB Cluster having 2 data nodes in a single node group and concluding with a cluster having 4 data nodes in 2 node groups.
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-optimization.html
row *************************** Table: accounts Non_unique: 0 Key_name: ACCOUNT Seq_in_index: 1 Column_name: USER Collation: NULL Cardinality: NULL Sub_part: NULL Packed: NULL Null: YES Index_type: HASH Comment: Index_comment: Visible: YES ...
https://dev.mysql.com/doc/refman/9.7/en/ansi-diff-foreign-keys.html
This means that you cannot use self-referential ON UPDATE CASCADE or ON UPDATE SET NULL operations. A self-referential ON DELETE SET NULL, on the other hand, is possible, as is a self-referential ON DELETE CASCADE. The MATCH clause in the SQL ...For ...
https://dev.mysql.com/doc/refman/9.7/en/engine-condition-pushdown-optimization.html
column IS [NOT] NULL column IN (value_list) Each item in the value_list must be a constant, literal value. row *************************** id: 1 select_type: SIMPLE table: x partitions: p0,p1 type: ALL possible_keys: NULL key: NULL key_len: NULL ...
https://dev.mysql.com/doc/refman/9.7/en/flow-control-functions.html
If no comparison or condition is true, the result after ELSE is returned, or NULL if there is no ELSE part. The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. If only one of expr2 or expr3 is ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-row-format.html
An SQL NULL value reserves one or two bytes in the record directory. An SQL NULL value reserves zero bytes in the data part of the record if stored in a variable-length column. Reserving fixed space for NULL values permits columns to be updated in ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-online-operations.html
This does not perform any defragmentation, which requires an OPTIMIZE TABLE or null ALTER TABLE statement. The columns must permit NULL values and not have any explicit default value other than NULL. row *************************** Table: t1 Create ... MySQL NDB Cluster supports online table schema changes using ALTER TABLE ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-management-range-list.html
Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this section. For information about working with tables that are partitioned by hash or key, see ...
https://dev.mysql.com/doc/refman/9.7/en/show-index.html
row *************************** Table: city Non_unique: 0 Key_name: PRIMARY Seq_in_index: 1 Column_name: ID Collation: A Cardinality: 4188 Sub_part: NULL Packed: NULL Null: Index_type: BTREE Comment: Index_comment: Visible: YES Expression: NULL ...