如何有條件的分步刪除數據表中的記錄
如何有條件的分步刪除數據表中的記錄 作者:eygle 出處: http://blog.eygle.com 日期:February 22, 2005 自己動手,豐衣足食 | Blog首頁 有時候我們需要分配刪除數據表的一些記錄,分批提交以減少對于Undo的使用,本文提供一個簡單的存儲過程用于實現該邏輯。
如何有條件的分步刪除數據表中的記錄
作者:eygle
日期:February 22, 2005
« 自己動手,豐衣足食 | Blog首頁
有時候我們需要分配刪除數據表的一些記錄,分批提交以減少對于Undo的使用,本文提供一個簡單的存儲過程用于實現該邏輯。
你可以根據你的需要進行適當調整,本例僅供參考:
SQL> create table test as select * from dba_objects;
Table created.
SQL> create or replace procedure deleteTab
2 /**
3 ** Usage: run the script to create the proc deleteTab
4 ** in SQL*PLUS, type "exec deleteTab('Foo','ID>=1000000','3000');"
5 ** to delete the records in the table "Foo", commit per 3000 records.
6 **
7 **/
8 (
9 p_TableName in varchar2, -- The TableName which you want to delete from
10 p_Condition in varchar2, -- Delete condition, such as "id>=100000"
11 p_Count in varchar2 -- Commit after delete How many records
12 )
13 as
14 pragma autonomous_transaction;
15 n_delete number:=0;
16 begin
17 while 1=1 loop
18 EXECUTE IMMEDIATE
19 'delete from '||p_TableName||' where '||p_Condition||' and rownum <= :rn'
20 USING p_Count;
21 if SQL%NOTFOUND then
22 exit;
23 else
24 n_delete:=n_delete + SQL%ROWCOUNT;
25 end if;
26 commit;
27 end loop;
28 commit;
29 DBMS_OUTPUT.PUT_LINE('Finished!');
30 DBMS_OUTPUT.PUT_LINE('Totally '||to_char(n_delete)||' records deleted!');
31 end;
32 /
Procedure created.
SQL> insert into test select * from dba_objects;
6374 rows created.
SQL> /
6374 rows created.
SQL> /
6374 rows created.
SQL> commit;
Commit complete.
SQL> exec deleteTab('TEST','object_id >0','3000')
Finished!
Totally 19107 records deleted!
PL/SQL procedure suclearcase/" target="_blank" >ccessfully completed.
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很簡單,但是想來也有人可以用到。
原文轉自:http://www.kjueaiud.com
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