Update to my previous message. Looks like something went wrong with an mmap. 2014-06-09 17:10:58 ERR my_database[32949]: = gdk_posix.c:560: MT_mremap(bat/11/1150.theap,c0000000,538312704,1076625408): p == MAP_FAILED Looks like the server ran out of memory but just kept going with a corrupted table? Should this have been allowed to happen or should the process have crashed? It looks like this bug is related, although it has a different cause: https://www.monetdb.org/bugzilla/show_bug.cgi?id=3450 Joe