I have seen many databases crash, yes crash, when
dual had more than one row or less than one?
Why you say?
As someone pointed out, this was an internal table to the kernel so
Oracle used it as they felt. It
was and still is considered a heartbeat mechanism within the kernel. In other words, don’t mess with it.
Thank You
Stephen
P. Karniotis
Technical Alliance Manager
Compuware Corporation
Direct: (313)
227-4350
Mobile: (248)
408-2918
Email: [EMAIL PROTECTED]
Web: www.compuware.com
-----Original
Message-----
From: Khedr, Waleed
[mailto:[EMAIL PROTECTED]
Sent: Thursday, October 30, 2003
2:05 PM
To: Multiple recipients of list
ORACLE-L
Subject: RE: dual
Do you think
it will work if it has no rows ?
Waleed
-----Original
Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Sent: Thursday, October 30, 2003
1:44 PM
To: Multiple recipients of list
ORACLE-L
Subject: Re: dual
You may find this interesting.
Looks like a 'where rownum = 1' is
always imposed on dual.
Same results on 8.1.7.4 and 9.2.0.4
Don't try this on anything other
than a trashable test database.
Jared
=======================================
10:42:04 dv03>@dt
10:42:05 dv03>
10:42:05 dv03>set echo on
10:42:05 dv03>
10:42:05 dv03>create table
jkstill.dual as select * from sys.dual;
Table created.
10:42:05 dv03>
10:42:05 dv03>select * from
jkstill.dual;
D
-
X
1 row selected.
10:42:05 dv03>
10:42:05 dv03>drop table
jkstill.dual;
Table dropped.
10:42:05 dv03>
10:42:05 dv03>insert into
sys.dual values('Y');
1 row created.
10:42:05 dv03>insert into
sys.dual values('Z');
1 row created.
10:42:05 dv03>
10:42:05 dv03>commit;
Commit complete.
10:42:05 dv03>
10:42:05 dv03>select * from
sys.dual;
D
-
X
1 row selected.
10:42:05 dv03>
10:42:05 dv03>create table
jkstill.dual as select * from sys.dual;
Table created.
10:42:05 dv03>
10:42:05 dv03>select * from
jkstill.dual;
D
-
X
Y
Z
3 rows selected.
10:42:05 dv03>
10:42:05 dv03>drop table
jkstill.dual;
Table dropped.
10:42:05 dv03>
10:42:05 dv03>delete from
sys.dual;
1 row deleted.
10:42:05 dv03>delete from
sys.dual;
1 row deleted.
10:42:05 dv03>delete from
sys.dual;
1 row deleted.
10:42:05 dv03>
10:42:05 dv03>insert into
sys.dual values('X');
1 row created.
10:42:05 dv03>commit;
Commit complete.
10:42:05 dv03>
10:42:05 dv03>
10:42:05 dv03>create table
jkstill.dual as select * from sys.dual;
Table created.
10:42:05 dv03>
10:42:05 dv03>select * from
jkstill.dual;
D
-
X
1 row selected.
10:42:05 dv03>
10:42:05 dv03>drop table
jkstill.dual;
Table dropped.
10:42:05 dv03>
|
|
<[EMAIL PROTECTED]>
Sent by:
[EMAIL PROTECTED]
10/30/2003 08:54 AM
Please respond to ORACLE-L
|
To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
cc:
Subject: dual
|
List, here is a
rtfm question which I was scared to ask, but its
bothering me too much so I just can't stay quite :
"why do multiple inserts into sys.dual complete sucessfully when connected
as
sysdba, but a subsequent select * from dual show only 1 row ?"
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