error while taking a copy of system statistics

Hi ,

I am trying to make copy of current system statistics so I am trying to take current system statistics to a table but I am getting a following error. Please suggest how to execute these procedures.

SQL> declare

system_statistics varchar2(30000);

begin

DBMS_STATS.GATHER_SYSTEM_STATS (

   stattab => system_statistics,

   statid  =>1

   );

end;

/  2    3    4    5    6    7    8    9

declare

*

ERROR at line 1:

ORA-20001: 1 is an invalid identifier

ORA-06512: at "SYS.DBMS_STATS", line 1975

ORA-06512: at "SYS.DBMS_STATS", line 1991

ORA-06512: at "SYS.DBMS_STATS", line 20184

ORA-06512: at line 4

Thanks

Rakesh K