ORA-00900: the SQL statement invalid when you run for immediate assistance.

Hello
I write code simple db is 9.2.0.8
create or replace procedure gather_part_stats(p_schema in varchar2, p_table in varchar2)
as
l_quarter varchar2(8) := to_char(sysdate, '"Y"YYYY"_Q"q') ;
l_sql varchar2(2000) := 'exec dbms_stats.gather_table_stats(:schema, :table, method_opt => ''for all columns size 1'' , cascade => true , estimate_percent => 1 , granularity => ''PARTITION'', partname=>:part);';
begin
dbms_output.put_line('l_quarter: ' || l_quarter);
dbms_output.put_line(l_sql);
execute immediate l_sql using in p_schema, in p_table, in l_quarter ;
end;
/
Trying to collect statistics of the table with the selected partition but mess up something with... something :)
I use use to avoid sql injection, please advice.

Error is:
SQL > gather_part_stats exec ('TEST', 'TEST');
l_quarter: Y2012_Q2
exec dbms_stats.gather_table_stats (: schema,: table, method_opt = > ' for all columns size 1', cascade = > true, estimate_percent = > 1, granularity = > 'PARTITION', partname = >: part);
BEGIN gather_part_stats ('TEST', 'TEST'); END;

*
ERROR on line 1:
ORA-00900: invalid SQL statement
ORA-06512: at the 'INSTALL '. GATHER_PART_STATS', line 8
ORA-06512: at line 1

Concerning
GregG

You must use the dynamic PL/SQL

create or replace procedure gather_part_stats(p_schema in varchar2, p_table in varchar2)
as
l_quarter varchar2(8) := to_char(sysdate, '"Y"YYYY"_Q"q') ;
l_sql varchar2(2000) := 'begin dbms_stats.gather_table_stats(ownname=>:schema, tabname=>:table, method_opt => ''for all columns size 1'' , cascade => true , estimate_percent => 1 , granularity => ''PARTITION'', partname=>:part); end;';
begin
dbms_output.put_line('l_quarter: ' || l_quarter);
dbms_output.put_line(l_sql);
execute immediate l_sql using in p_schema, in p_table, in l_quarter ;
end;
/ 

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