SQL分段处理删除大量数据

最近在里面，有人问起如何使用分段处理，竟然忘记如何操作，当时只是COPY一本书里的内容，只记得大致的步骤，先重新温习，以便记忆：

实现功能：

1.分段处理

2.拆分操作

3.批量绑定

－－摘自《Oracle 数据库性能优化》

CREATE OR REPLACE PROCEDURE del_hubel_SSF_forall
as
type ridArray is table of rowid index by binary_integer;
type dtArray is table of varchar2(50) index by binary_integer;

v_rowid ridArray;
v_mid_to_delete dtArray;
BEGIN
SELECT mid, rowid bulk_collect into v_mid_to_delete, v_rowid from temp_mid_hubei_bak WHERE ROWNUM<10001;
FORALL i in 1.. v_mid_to_delete.COUNT
DELETE FROM SSF WHERE mid=v_mid_to_delete(i);
--DBMS_OUTPUT_LINE(TO_CHAR(v_mid_to_delete.COUNT) || ' records deleted from hubei_SSF !!!');
FORALL i in i .. v_rowid.COUNT
DELETE FROM temp_mid_hubei_bak WHERE ROWID=v_rowid(i);
--DBMS_OUTPUT_LINE(TO_CHAR(v_mid_to_delete.COUNT) || ' records deleted from hubei_SSF !!!');
END;

CREATE OR REPLACE PROCEDURE exec_forall
(
p_RowCount in number, --Total need to delete rows count
p_ExeCount in number
)
AS
n_RowCount number:=0;
n_ExeTimes number:=0;
n_Delete number:=0;
BEGIN
n_RowCount :=p_RowCount;

WHILE n_RowCount>0
LOOP
EXECUTE IMMEDIATE 'begin del_hubei_SSF_forall; end;';
COMMIT;

IF n_RowCount>p_ExeCount THEN
n_RowCount:=n_RowCount-p_ExeCount;
n_ExeTime:=n_ExeTimes+1;
ELSE
n_ExeTimes :=n_ExeTimes+1;
n_Delete:=RowCount;
n_RowCount:=n_RowCount-p_ExeCount;
END IF;
--DBMS_OUTPUT_LINE('----------------' || TO_CHAR(n_ExeTimes) || '--------------');
n_delete :=n_delete+p_ExeCount*(n_ExeTimes-1);
END LOOP;
--DBMS_OUTPUT_LINE('Full Finished!!!');
--DBMS_OUTPUT_LINE('Totally' || TO_CHAR(n_delete) || 'records deleted. !!!');
END;