"=?iso-8859-1?Q?frank=5Flupo?=" <frank_lupo(at)email(dot)it> writes:
> I work using postgresql in cygwin version:
> PostgreSQL 7.3.2 on i686-pc-cygwin, compiled by GCC gcc (GCC) 3.2 20020927 (prerelease)
> When delete a record I recive the message :
> heap_mark4update: (am)invalid tid
Do you have a trigger on the table? If so this is probably a known bug.
Update to 7.3.3 and see if it goes away.
regards, tom lane