Oracle大批量删除数据方法_绿色软件之家

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Oracle大批量删除数据方法

时间:2015/6/28来源:绿色软件之家作者:网管联盟我要评论(0)

  批量删除海量数据通常都是很复杂及缓慢的,方法也很多,但是通常的概念是:分批删除,逐次提交。

  下面是我的删除过程,我的数据表可以通过主键删除,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。

  首先创建一下过程,使用自制事务进行处理:

  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 <= :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;

  以下是删除过程及时间:

  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 /

#p#副标题#e#

  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!

  Totally 96936 records deleted!

  PL/SQL procedure successfully completed.

  Elapsed: 00:00:18.61

  10万记录大约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.

关键词标签:Oracle大批量删除数据

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