实例讲解Oracle的快速删除和快速插入

Oracle的快速删除和快速插入

快速插入

SQL> insert /**//*+append*/ into t select * from
dba_objects nologging;

9157 rows created.

SQL> select a.xidusn,a.xidslot,a.used_ublk,
a.used_urec,b.username
 2 from v$transaction a,v$session b,v$mystat c
 3 where a.addr = b.taddr and c.statistic# = 1
 4 /

 XIDUSN XIDSLOT USED_UBLK USED_UREC USERNAME
---------- ---------- ---------- ---------- -------
 2 21 1 1 CUST

SQL> commit;

Commit complete.

SQL> insert into t select * from dba_objects;

9157 rows created.

SQL> select a.xidusn,a.xidslot,a.used_ublk,
a.used_urec,b.username
 2 from v$transaction a,v$session b,v$mystat c
 3 where a.addr = b.taddr and c.statistic# = 1
 4 /

 XIDUSN XIDSLOT USED_UBLK USED_UREC USERNAME
---------- ------- ---------- ---------- -----
 1 1 13 423 CUST

快速删除

建个存储过程,达到2000条或者更多条,提交一次.

create or replace PRocedure p_delete
as
n number(10);
cursor my_cur is select * from t1;
begin
n:=0;
for i in my_cur loop
delete from t1 where <条件>;
n:=n+1;
if (mod(n,2000))=0 then
commit;
end if;
end loop;
end;
/