[MonetDB-users] Random errors and segfaults executing concurrent queries

Hi, I'm experiencing a lot of instabilities using MonetDB-Feb2009 on a moderately big database (70GB) with 3 concurrent (read only) connections. In my test setup, i have 3 identical tables which i query in parallel (from 3 jdbc connections). Almost every time, i get some weird errors: TypeException:user.s213_7[16]:'io.s13_4' undefined in: _26:any := io.s13_4() TypeException:user.s244_2[18]:'io.s14_6' undefined in: _31:any := io.s14_6() TypeException:user.s236_8[31]:'io.s18_3' undefined in: _47:any := io.s18_3() .... Finally, at some point, the server often segfault. Is there anything i can do to improve this ? Thanks,