Distributed MySQL Privileges with NDB_STORED_USER •The columns must be added following any existing columns. If you attempt to add a column online before any existing columns or using the  FIRST  keyword, the statement fails with an error. •Existing table columns cannot be reordered online. For online  ALTER TABLE  operations on  NDB  tables, fixed-format columns are converted to dynamic when they are added online, or when indexes are created or dropped online, as shown here (repeating the CREATE TABLE  and  ALTER TABLE  statements just shown for the sake of clarity): Only the column or columns to be added online must be dynamic. Existing columns need not be; this includes the table’s primary key, which may also be  FIXED , as shown here: Columns are not converted from  FIXED  to  DYNAMIC  column format by renaming operations. For more information about  COLUMN_FORMAT , see Section 13.1.20, “CREATE TABLE Statement” . The  KEY ,  CONSTRAINT , and  IGNORE  keywords are supported in  ALTER TABLE  statements using ALGORITHM=INPLACE . Setting  MAX_ROWS  to 0 using an online  ALTER TABLE  statement is disallowed. You must use a copying ALTER TABLE  to perform this operation. (Bug #21960004) NDB 8.0.18 introduces a new mechanism for sharing and synchronizing users, roles, and privileges between SQL nodes connected to an NDB Cluster. This can be enabled by granting the NDB_STORED_USER  privilege. See the description of the privilege for usage information. 23.5.12 Distributed MySQL Privileges with NDB_STORED_USER 4507 mysql>  CREATE TABLE t2 ( > c1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY > ) ENGINE=NDB; Query OK, 0 rows affected (1.44 sec) mysql>  ALTER TABLE t2 > ADD COLUMN c2 INT, > ADD COLUMN c3 INT, > ALGORITHM=INPLACE; Query OK, 0 rows affected, 2 warnings (0.93 sec) mysql>  SHOW WARNINGS; *************************** 1. row *************************** Level: Warning Code: 1478 Message: Converted FIXED field ’c2’ to DYNAMIC to enable online ADD COLUMN *************************** 2. row *************************** Level: Warning Code: 1478 Message: Converted FIXED field ’c3’ to DYNAMIC to enable online ADD COLUMN 2 rows in set (0.00 sec) mysql>  CREATE TABLE t3 ( > c1 INT NOT NULL AUTO_INCREMENT PRIMARY KEY COLUMN_FORMAT FIXED > ) ENGINE=NDB; Query OK, 0 rows affected (2.10 sec) mysql>  ALTER TABLE t3 ADD COLUMN c2 INT, ALGORITHM=INPLACE; Query OK, 0 rows affected, 1 warning (0.78 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql>  SHOW WARNINGS; *************************** 1. row *************************** Level: Warning Code: 1478 Message: Converted FIXED field ’c2’ to DYNAMIC to enable online ADD COLUMN 1 row in set (0.00 sec)