<script type="text/javascript" src="http://extjs.cachefly.net/ext-2.2/ext-all.js"> </script>
<link rel="stylesheet" type="text/css" href="http://extjs.cachefly.net/ext-2.2/resources/css/ext-all.css">

-- Create table with one record
create table t (b varchar2(100));
insert into t values ('hello world - works');
commit;
-- Look at the data
select * from t;
-- What timestamp did I still see my data -19-NOV-08 02.09.23.478019000 PM +00:00
SELECT SYSTIMESTAMP FROM dual;
-- Create an index
create index t_idx on t (b);
-- Delete all the data from my table and commit
delete from t;
commit;
-- There's no data anymore, nice
select * from t;
-- And with the flashback technology I see my data
select * from t as of timestamp to_timestamp('19-NOV-08 02.09.23.478 PM');
-- Insert another record
insert into t values ('hello world - no go');
commit;
-- Do some DDL on the table now, add a constraint
alter table t add constraint t_pk primary key (b)
select * from t;
-- I still see my data at this stage, but now we drop the constraint and delete the records
alter table t drop constraint t_pk;
delete from t;
commit;
-- Use flashback again
select * from t as of timestamp to_timestamp('19-NOV-08 02.09.23.478 PM');
-- I can't get to my data anymore