drop table if exists t1,t2; create table t1 ( a int not null, b int not null, primary key using hash (a), unique key using hash (b) ) engine ndb; create table t2 ( a int not null, b int not null, primary key using hash (a), key (b) ) engine ndb comment="NDB_TABLE=FULLY_REPLICATED=1"; alter table t2 add constraint fk1 foreign key (b) references t1(a); insert into t1 values (1,1); insert into t2 values (1,1); delete from t2 where b = 1; ERROR HY000: Got temporary error 1218 'Send Buffers overloaded in NDB kernel' from NDBCLUSTER insert into t2 values (2,1); ERROR HY000: Got temporary error 1218 'Send Buffers overloaded in NDB kernel' from NDBCLUSTER drop table t2; drop table t1;