寫一個迴圈刪除的過程。

create or replace procedure delBigTab(p_TableName in varchar2,p_Condition in varchar2,p_Count in varchar2)
as
pragma autonomous_transaction;
n_delete number:=0;

begin
 while 1=1 loop
EXECUTE IMMEDIATE
'delete from '||p_TableName||' where '||p_Condition||' and rownum <= :10000'
USING p_Count;
if SQL%NOTFOUND then
exit;
else
n_delete:=n_delete + SQL%ROWCOUNT;
end if;
commit;
end loop;
commit;
DBMS_OUTPUT.PUT_LINE('Finished!');
DBMS_OUTPUT.PUT_LINE('Totally '||to_char(n_delete)||' records deleted!');
 
end delBigTab; 

呼叫：

SQL> set timing on
SQL> exec delBigTab('HS_DLF_DOWNLOG_HISTORY','NUMDLFLOGGUID < 11100000','10000');
PL/SQL procedure successfully completed.

Elapsed: 00:00:18.54

方法雖好，但我應用在一個億級資料庫時還是覺得慢得不行。就算刪一點點資料也覺得好象挺慢的。