批量刪除海量資料通常都是很複雜及緩慢的，方法也很多，但是通常的概念是:分批刪除，逐次提交。
下面是我的刪除過程，我的資料表可以通過主鍵刪除，測試過delete和for all兩種方法，for all在這裡並沒有帶來效能提高，所以仍然選擇了批量直接刪除。
首先建立一下過程，使用自製事務進行處理：
create or replace procedure delbigtab
(p_tablename in varchar2,
p_condition in varchar2,
p_count in varchar2)as
pragmaautonomous_transaction;
n_delete number:=0;
begin
while 1=1 loop
execute immediate
'delete from '||p_tablename||' where '||p_condition||' and rownum <= :rn'
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;
sql> create or replace procedure delbigtab
2 (
3 p_tablename in varchar2,
4 p_condition in varchar2,
5 p_count in varchar2
6 )
7 as
8 pragma autonomous_transaction;
9 n_delete number:=0;
10 begin
11 while 1=1 loop
12 execute immediate
13 'delete from '||p_tablename||' where '||p_condition||' and rownum <= :rn'
14 using p_count;
15 if sql%notfound then
16 exit;
17 else
18 n_delete:=n_delete + sql%rowcount;
19 end if;
20 commit;
21 end loop;
22 commit;
23 dbms_output.put_line('finished!');
24 dbms_output.put_line('totally '||to_char(n_delete)||' records deleted!');
25 end;
26 /
procedure created.
sql> set timing on
sql> select min(numdlflogguid) from hs_dlf_downlog_history;
min(numdlflogguid)
------------------
11000000
elapsed: 00:00:00.23
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 11100000','10000');
pl/sql procedure successfully completed.
elapsed: 00:00:18.54
sql> select min(numdlflogguid) from hs_dlf_downlog_history;
min(numdlflogguid)
------------------
11100000
elapsed: 00:00:00.18
sql> set serveroutput on
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 11200000','10000');
finished!
totally96936records deleted!
pl/sql procedure successfully completed.
elapsed:00:00:18.61
10萬記錄大約19s
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 11300000','10000');
finished!
totally 100000 records deleted!
pl/sql procedure successfully completed.
elapsed: 00:00:18.62
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 11400000','10000');
finished!
totally 100000 records deleted!
pl/sql procedure successfully completed.
elapsed: 00:00:18.85
sql>
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 13000000','10000');
finished!
totally 1000000 records deleted!
pl/sql procedure successfully completed.
elapsed: 00:03:13.87
100萬記錄大約3分鐘
sql> exec delbigtab('hs_dlf_downlog_history','numdlflogguid < 20000000','10000');
finished!
totally 6999977 records deleted!
pl/sql procedure successfully completed.
elapsed: 00:27:24.69
700萬大約27分鐘
以上過程僅供參考.
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