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https://dev.mysql.com/doc/refman/5.7/en/compressed-format.html
Compressed tables have the following characteristics: Compressed tables take very little disk space. The header for a row takes up one to three bytes depending on the biggest row in the table. Note While a compressed table is read only, and you ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-files-table.html
The Information Schema FILES table provides metadata about all InnoDB tablespace types including file-per-table tablespaces, general tablespaces, the system tablespace, temporary table tablespaces, and undo tablespaces (if present). Note The ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cluster-locks.html
The cluster_locks table provides information about current lock requests holding and waiting for locks on NDB tables in an NDB Cluster, and is intended as a companion table to cluster_operations. Information obtain from the cluster_locks table may ...The transaction ID (transid column) is the identifier generated by the NDB API for the transaction requesting or holding the current ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-transporters.html
This information is shown in the table's status column, which can have any one of the following values: CONNECTING, CONNECTED, DISCONNECTING, or DISCONNECTED. Rows where the node_id is that of a data node which is not currently connected are not ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-delete-all.html
In some cases, this can be much faster than DELETE or even TRUNCATE TABLE. Usage ndb_delete_all -c connection_string tbl_name -d db_name This deletes all rows from the table named tbl_name in the database named db_name. Options that can be used with ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/5.7/en/commit.html
To disable autocommit mode implicitly for a single series of statements, use the START TRANSACTION statement: START TRANSACTION; SELECT @A:=SUM(salary) FROM table1 WHERE type=1; UPDATE table2 SET summary=@A WHERE type=1; COMMIT; With START ...SET ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, the auto-update value, or both: An auto-initialized column is set to the current timestamp for inserted rows that specify no value for the ...
https://dev.mysql.com/doc/refman/5.7/en/user-resources.html
Only statements that modify databases or tables count against the update limit. An “account” in this context corresponds to a row in the mysql.user system table. That is, a connection is assessed against the User and Host values in the user ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-online-add-node-basics.html
Exception: For tables created using the MAX_ROWS option, this statement does not work; instead, use ALTER TABLE ... ALGORITHM=INPLACE, REORGANIZE PARTITION statement in the mysql client for each NDBCLUSTER table. Note This needs to be done only for ... In this section, we list the basic steps required to add new data nodes to an NDB ...
https://dev.mysql.com/doc/refman/5.7/en/drop-index.html
This statement is mapped to an ALTER TABLE statement to drop the index. They have the same meaning as for the ALTER TABLE statement. For more information, see Section 13.1.8, “ALTER TABLE Statement” NDB Cluster formerly supported online DROP ...