I was testing some queries, and for example this query has made the mserver5 process 100% CPU, which i could not kill and machine could not be rebooted. running Fedora 8 64 bit. query like this: select col1, col2, sum(col3), sum(col4), sum(col5) from thetable group by col1, col2; there are about 160 columns in the table. col1 and col2 are "smallint" col3, col4, col5 are "real" number of distinct values: in col1 is about 120 in col2 about 80 total number of rows in table is about 400M I tested the query 2 times, simpler queries work ok, like this: select col1, count(*) from thetable group by col1; this query has crashed mserver5 before, not sure if this already fixed: select col1, count(1) from thetable group col1; -- View this message in context: http://www.nabble.com/mserver5-process-locked-unkillable-tp16789362p16789362... Sent from the monetdb-users mailing list archive at Nabble.com.