Thank you Jennie Zhang. 1. I have MonetDB Database Server Toolkit v1.1 (Feb2013-SP3) (i install so: sudo apt-get install monetdb5-sql monetdb-client) shell> monetdbd create /path/to/mydbfarm shell> monetdbd start /path/to/mydbfarm shell> monetdb create voc shell> monetdb release voc 2. Ubuntu 12.04.3 LTS 3. Schema view schemadatamonetdb.sql file 4. Data: timedimension view datatimediM.csv bi_con_cdr_diario: cdr.csv But the error is when i do group by as (select sum(minutosfacturados),succodigo,montht,comnombre2 from bi_con_cdr_diario as cdr inner join timedimension as td on cdr.idtimedimension=td.id where comcodigo=4 group by succodigo,comnombre2,montht;) and have 10.000.000 of rows. I appreciate very much your help. I believe this is one great product. Best Regards, Edgar Mejia