Bug in bash 3.00.16 ?

Hello ! For some time now, I had a problem which I thought oracle was the reason for. Now I found, that it seems to be a Bash problem. I'm using GNU bash, version 3.00.16(1)-release (i586-suse-linux) on SuSE 9.3 This is the "buggy behaviour": Whenever I "su - oracle" into the oracle account,

shared history between bash shells version 2.05 and greater

Configuration Information [Automatically generated, do not change]: Machine: powerpc OS: aix5.1 Compiler: xlc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='powerpc' -DCONF_OSTYPE='aix5.1' -DCONF_MACHTYPE='powerpc-ibm-aix5.1' -DCONF_VENDOR='ibm' -DSHELL -DHAVE_CONFIG_H -I. -I. -I./inclu