"Tarabas (Manuel Rorarius)" <tarabas(at)tarabas(dot)de> writes:
> We currently have a serious problem with our postgres-DB!
I think you've got hardware problems. Have you tried running memory and
disk tests? memtest86 and badblocks are the commonly recommended
tools. Past reports have suggested that badblocks is more likely to
detect problems if you use the "destructive test" option.
regards, tom lane