eferenced in a
        foreign key now take the new <TT
CLASS="LITERAL"
>NO KEY UPDATE</TT
> lock mode on
        the row, while foreign key checks use the new <TT
CLASS="LITERAL"
>KEY SHARE</TT
>
        lock mode, which does not conflict with <TT
CLASS="LITERAL"
>NO KEY UPDATE</TT
>.
        So there is no blocking unless a foreign-key column is changed.
       </P
></LI
><LI
><P
>        Add configuration variable <A
HREF="runtime-config-client.html#GUC-LOCK-TIMEOUT"
><TT
CLASS="VARNAME"
>lock_timeout</T