I recomplied monetdb several times (make & make install). Everything was fine. Then I downloaded monetdb_python. It was not able to install and I decided to recompile and install again regular Monetdb, but when I "mclient -u monetdb -d voc" I get error in the log file: 2016-03-25 17:26:18 MSG merovingian[49368]: starting database 'voc', up min/avg/max: 0s/0s/0s, crash average: 0.00 0.00 0.00 (0-0=0) 2016-03-25 17:26:18 MSG voc[49379]: arguments: /usr/local/bin/mserver5 --dbpath=/home/shmagi/db/voc --set merovingian_uri=mapi:monetdb://infdbserv02:50000/voc --set mapi_open=false --set mapi_port=0 --set mapi_usock=/home/shmagi/db/voc/.mapi.sock --set monet_vault_key=/home/shmagi/db/voc/.vaultkey --set gdk_nr_threads=24 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes 2016-03-25 17:26:18 MSG merovingian[49368]: database 'voc' (49379) has crashed (dumped core) 2016-03-25 17:26:18 ERR merovingian[49368]: client error: database 'voc' appears to shut itself down after starting, check monetdbd's logfile for possible hints 2016-03-25 17:26:18 MSG merovingian[49368]: starting database 'voc', up min/avg/max: 0s/0s/0s, crash average: 0.00 0.00 0.00 (0-0=0) 2016-03-25 17:26:19 MSG voc[49382]: arguments: /usr/local/bin/mserver5 --dbpath=/home/shmagi/db/voc --set merovingian_uri=mapi:monetdb://infdbserv02:50000/voc --set mapi_open=false --set mapi_port=0 --set mapi_usock=/home/shmagi/db/voc/.mapi.sock --set monet_vault_key=/home/shmagi/db/voc/.vaultkey --set gdk_nr_threads=24 --set max_clients=64 --set sql_optimizer=default_pipe --set monet_daemon=yes 2016-03-25 17:26:19 MSG merovingian[49368]: database 'voc' (49382) has crashed (dumped core) 2016-03-25 17:26:23 ERR merovingian[49368]: client error: database 'voc' appears to shut itself down after starting, check monetdbd's logfile for possible hints. Any ideas how to fix or delete all files of Monetdb to install from the scratch?