sql%rowcount

sql%rowcount用于记录修改的条数，就如你在sqlplus下执行delete from之后提示已删除xx行一样，这个参数必须要在一个修改语句和commit之间放置，否则你就得不到正确的修改行数。
例如：
SQL> declare n number;
2 begin
3 insert into test_a select level lv from dual connect by level<500;
4 n:=sql%rowcount;
5 commit;
6 dbms_output.put_line(n);
7 end;
8 /
499

PL/SQL procedure successfully completed.
SQL> declare n number;
2 begin
3 insert into test_a select level lv from dual connect by level<500;
4 commit;
5 n:=sql%rowcount;
6 dbms_output.put_line(n);
7 end;
8 /
如果我连续执行了3个select语句
然后调用sql%rowcount，得到的结果是最后一个select的条数。要统计所有的，可以使用三个变量接收sql%rowcount，然后相加即可，不过貌似直接select的写法无法使用sql%rowcount。

以下转自

http://www.eygle.com/archives/2005/04/oracleoeouaeeae.html

测试过Delete和For all两种方法，for all在这里并没有带来性能提高，所以仍然选择了批量直接删除。

create or replace procedure delBigTab(p_TableName in varchar2,
                                      p_Condition in varchar2,
                                      p_Count     in varchar2)
aspragma autonomous_transaction;
n_delete number := 0;
begin
    while 1 = 1 loopEXECUTE IMMEDIATE 'delete from ' || p_TableName || ' where ' || p_Condition || ' and rownum <= :rn' USING p_Count;
     if SQL%NOTFOUND thenexit; elsen_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;

以下是删除过程及时间:

SQL> create or replace procedure delBigTab2  (3    p_TableName       in    varchar2,4    p_Condition       in    varchar2,5    p_Count        in    varchar26  )7  as8   pragma autonomous_transaction;9   n_delete number:=0;10  begin11   while 1=1 loop12     EXECUTE IMMEDIATE13       'delete from '||p_TableName||' where '||p_Condition||' and rownum <= :rn'14     USING p_Count;15     if SQL%NOTFOUND then16        exit;17     else18              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)
------------------11000000Elapsed: 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)
------------------11100000Elapsed: 00:00:00.18
SQL> set serveroutput on
SQL> exec delBigTab('HS_DLF_DOWNLOG_HISTORY','NUMDLFLOGGUID < 11200000','10000');
Finished!
Totally 96936 records deleted!PL/SQL procedure successfully completed.Elapsed: 00:00:18.61
10万记录大约19sSQL> 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: 00:03:13.87100万记录大约3分钟
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
700万大约27分钟以上过程仅供参考.

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