Hi.
I am wondering whether the following problem can
be avoided by using Cascade Deleting while the DB
is in Read Committed Isolation Level:
In the following scenario, The "DEL item1 from tb_pk"
command fails because of involating foreign key
constraints.
(The tb_fk1, tb_fk2, and tb_fk3 tables reference the
tb_pk table)
Transaction A Transaction B
begin() |
| |
DEL item1 from tb_fk1 begin()
| |
DEL item1 from tb_fk2 INS item1 into tb_fk1
| |
DEL item1 from tb_fk3 commit()
|
DEL item1 from tb_pk
|
|( failed because of involating foreign key constraint.)
|
commit()
My real question is:
Will Executing "CASCADE DEL item1 from tb_pk" fail
if another transaction insert item1 into tb_fk1
during executing "CASCADE DEL item1 from tb_pk"?
Thanks
Duan
---------------------------------------------------
Duan Ligong
E-MAIL : dua...@nec-as.nec.com.cn
Tel : 010-82334433-354
: 8-0086-22-354
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