如何有條件的分段刪除資料表中的記錄

如何有條件的分段刪除資料表中的記錄作者:eygle出處:http://blog.eygle.com日期:February 22, 2005

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有時候我們需要分配刪除資料表的一些記錄，分批提交以減少對於Undo的使用，本文提供一個簡單的預存程序用於實現該邏輯。
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 successfully completed.

很簡單，但是想來也有人可以用到。