Hi,

- OS is Debian 7 64-bit, in a VM in VMware virtualization System.
- Hard disk 100G with 26% usage.
- 5 cores.
- 6G RAM.
- Version MonetDB: MonetDB 5 server v11.15.17 "Feb2013-SP5"
- Table: create table (id int, dt date, product varchar (50) .... etc, and another 30 columns between int and varchar.
- Query: select dt, count (id) from table where produtct in (....) group by dt
- History:
    Long time MonetDB use with Pentaho (Saiku) for analysis of data cubes,
    never had problems, works great with millions of records.
    When the problem occurred, the steps taken were:
        1- A couple of days before it occurred, I made a 32 million load records to the table.
        2- I used this table for many analyzes via SQL client (without using cubes) and everything was fine.
        3- I created a cube in Pentaho for this table and also used a lot and everything went well.
        4- When I put the dt fields in the cube and the interface seems to have caught the Pentaho and mserver held
            all machine resources (memory and CPU), less disk. This lock may have been because the
            Pentaho, but specifically the mondrian, have had a problem with the date field
        5- I tried to stop the Pentaho, but did not work, had to force a kill -9 pid.
        6- In the case of MonetDB, the command MonetDB stop dw, worked properly and stopped the service.
        7- When I run MonetDB start dw, it took a while longer than usual, but the service start
            usually without showing error on console.
        8- With other tables there were no data loss problem, only that table
            lost data just the product column, which was used in the query, the remaining columns have not suffered
            problems. But but at no time update or delete command has been executed, only
            selects were executed
        9- All though I forced Pentaho standing in the execution of the query, but MonetDB
            stopped normal, and a query should never change data, of course?

Log
2015-03-31 15:58:38 MSG control[1114]: (local): served status list
2015-03-31 15:58:38 MSG merovingian[1114]: sending process 14173 (database 'dw-zoombox') the TERM signal
2015-03-31 15:58:39 MSG merovingian[1114]: database 'dw-zoombox' (14173) has exited with exit status 0
2015-03-31 15:58:39 MSG merovingian[1114]: database 'dw-zoombox' has shut down
2015-03-31 15:58:39 MSG control[1114]: (local): stopped database 'dw-zoombox'
2015-03-31 15:58:44 MSG control[1114]: (local): served status list
2015-03-31 15:58:44 MSG merovingian[1114]: starting database 'dw-zoombox', up min/avg/max: 2d/9w/18w, crash average: 0.00 0.10 0.03 (3-2=1)
2015-03-31 15:58:45 MSG dw-zoombox[19366]: arguments: /usr/bin/mserver5 --dbpath=/dados/dbfarm/dw-zoombox --set merovingian_uri=mapi:monetdb://SRVBIL01:50000/dw-zoombox --set mapi_open=false --set mapi_port=0 --set mapi_usock=/dados/dbfarm/dw-zoombox/.mapi.sock --set monet_vault_key=/dados/dbfarm/dw-zoombox/.vaultkey --set gdk_nr_threads=5 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # MonetDB 5 server v11.15.17 "Feb2013-SP5"
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Serving database 'dw-zoombox', using 5 threads
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Compiled for x86_64-pc-linux-gnu/64bit with 64bit OIDs dynamically linked
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Found 11.765 GiB available main-memory.
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Copyright (c) 1993-July 2008 CWI.
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Copyright (c) August 2008-2013 MonetDB B.V., all rights reserved
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Visit http://www.monetdb.org/ for further information
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # Listening for UNIX domain connection requests on mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock
2015-03-31 15:59:34 MSG dw-zoombox[19366]: # MonetDB/SQL module loaded
2015-03-31 15:59:34 MSG control[1114]: (local): started 'dw-zoombox'
2015-03-31 15:59:34 MSG merovingian[1114]: proxying client 192.168.1.7:49105 for database 'dw-zoombox' to mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock?database=dw-zoombox
2015-03-31 15:59:34 MSG merovingian[1114]: target connection is on local UNIX domain socket, passing on filedescriptor instead of proxying
2015-03-31 16:05:00 MSG merovingian[1114]: proxying client 192.168.1.7:49117 for database 'dw-zoombox' to mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock?database=dw-zoombox
2015-03-31 16:05:00 MSG merovingian[1114]: target connection is on local UNIX domain socket, passing on filedescriptor instead of proxying
2015-03-31 16:05:20 MSG merovingian[1114]: proxying client 192.168.1.7:49119 for database 'dw-zoombox' to mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock?database=dw-zoombox
2015-03-31 16:05:20 MSG merovingian[1114]: target connection is on local UNIX domain socket, passing on filedescriptor instead of proxying
2015-03-31 16:06:05 ERR discovery[1114]: cannot retrieve name info: Temporary failure in name resolution
2015-03-31 16:16:05 ERR discovery[1114]: cannot retrieve name info: Temporary failure in name resolution
2015-03-31 16:16:16 MSG merovingian[1114]: proxying client 192.168.1.8:50220 for database 'dw-zoombox' to mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock?database=dw-zoombox
2015-03-31 16:16:16 MSG merovingian[1114]: target connection is on local UNIX domain socket, passing on filedescriptor instead of proxying
2015-03-31 16:17:04 MSG merovingian[1114]: proxying client 192.168.1.7:49159 for database 'dw-zoombox' to mapi:monetdb:///dados/dbfarm/dw-zoombox/.mapi.sock?database=dw-zoombox
2015-03-31 16:17:04 MSG merovingian[1114]: target connection is on local UNIX domain socket, passing on filedescriptor instead of proxying