 to get past the error and retrieve undamaged tuples that might still be
        present in the table if the block header is still sane. If the header is
        corrupt an error will be reported even if this option is enabled. The
        default setting is <TT
CLASS="LITERAL"
>off</TT
>, and it can only be changed by a superuser.
       </P
></DD
><DT
><A
NAME="GUC-ZERO-DAMAGED-PAGES"
></A
><TT
CLASS="VARNAME"
>zero_damaged_pages</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Detection of a