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select @@global.lower_case_table_names; @@global.lower_case_table_names 1 # test FK name is stored lower case create table T1 ( a int primary key ) engine=ndb; insert into t1 values (1); create table T2 ( a int primary key, b int, foreign key myFK1 (a) references t1 (a), key XB (b) ) engine=ndb; alter table T2 add constraint foreign key MYfk2 (b) references test.t1 (a); show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, PRIMARY KEY (`a`), KEY `XB` (`b`), CONSTRAINT `myfk1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION, CONSTRAINT `myfk2` FOREIGN KEY (`b`) REFERENCES `t1` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=ndbcluster DEFAULT CHARSET=latin1 insert into t2 values (2,1); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) insert into t2 values (1,2); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) ndb_show_tables completed..... select count(*) from ndb_show_tables_results where type = "'UserTable'" and name in ( "'t1'", "'t2'"); count(*) 2 select count(*) from ndb_show_tables_results where type = "'ForeignKey'" and name like "'%myfk%'"; count(*) 2 alter table T2 drop foreign key MYfk1; alter table t2 drop foreign key myFK2, algorithm=copy; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, PRIMARY KEY (`a`), KEY `XB` (`b`) ) ENGINE=ndbcluster DEFAULT CHARSET=latin1 # test upper case parent database and table drop table T2; create table T2 ( a int primary key, b int, foreign key myFK1 (a) references T1 (a), key XB (b) ) engine=ndb; alter table T2 add constraint foreign key MYfk2 (b) references TEST.T1 (a); show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, PRIMARY KEY (`a`), KEY `XB` (`b`), CONSTRAINT `myfk1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION, CONSTRAINT `myfk2` FOREIGN KEY (`b`) REFERENCES `t1` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=ndbcluster DEFAULT CHARSET=latin1 insert into t2 values (2,1); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) insert into t2 values (1,2); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) drop table t2,t1;