config root man

Larger MaxAllowedPacket as this limits the size of Blob MySQLD can handle
show variables like 'max_allowed_packet';
Variable_name	Value
max_allowed_packet	104857600
use test;
create table t1 (a int primary key, b longtext) engine=ndb;
create procedure heavy_insert(times int, bytes int)
begin
set @x = 0;
repeat
insert into t1 values (1, repeat('B', bytes));
delete from t1 where a=1;
set @x = @x + 1;
until @x = times
end repeat;
insert into t1 values (1, repeat('B', bytes));
end %
create procedure heavy_read(times int)
begin
set @x = 0;
repeat
select a, length(b) from t1 where a=1;
set @x = @x + 1;
until @x = times
end repeat;
end %
Set unlimited batch size for reads+writes
set ndb_blob_read_batch_bytes = 0;
set ndb_blob_write_batch_bytes = 0;
Now try a heavy insert - idea is to show SendBufferMemory overload on insert
call heavy_insert(20, 5*1024*1024);
delete from t1;
set ndb_blob_write_batch_bytes=100 * 1024;
Now heavy insert should succeed
call heavy_insert(10, 5*1024*1024);
Now heavy read should fail
call heavy_read(100);
set ndb_blob_read_batch_bytes=100 * 1024;
Now heavy read should succeed
call heavy_read(100);
set ndb_blob_write_batch_bytes=0;
set ndb_blob_read_batch_bytes=0;
drop procedure heavy_insert;
drop procedure heavy_read;
drop table t1;