 the command instead
      waits until conflicting transactions have completed.
     </P
><P
>      There are several caveats to be aware of when using this option.
      Only one index name can be specified, and the <TT
CLASS="LITERAL"
>CASCADE</TT
> option
      is not supported.  (Thus, an index that supports a <TT
CLASS="LITERAL"
>UNIQUE</TT
> or
      <TT
CLASS="LITERAL"
>PRIMARY KEY</TT
> constraint cannot be dropped this way.)
      Also, regular <TT
CLASS="COMMAND"
>DROP INDEX</TT
> commands can be
