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 ´¥·¢Æ÷ trigger
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create or replace trigger trigger_name
       before |after
       insert |delete | update |{[of column[,column ...]]
       on [schema.]table_name
 for each row
       [when condition]
 trigger_body;
eg(×ÐϸÌå»á):
create or replace trigger hello_tri
        before insert or delete or update on emp
        for each row
begin
       dbms_output.put_line('ÎÒÊÇ´¥·¢Æ÷£¡');
end;


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 1. flashback table table_test to timestamp to_timestamp('20091103000000','yyyymmddhh24miss');
 2.Èç¹û報錯ORA-08189: cannot flashback the table because row movement is not enabled
 3.alter table table_test enable row movement;
 4.OK ......

Oracle Shrink Table


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1.select name,log_mode from v$database;
NAME               LOG_MODE
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QUERY           NOARCHIVELO ......
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