If you query the STATUS column of the dba_rollback_seg it will be
ONLINE,OFFLINE, PENDING or something like that. The status will tell you
when it is free and OFFLINE.
Ron
>>> [EMAIL PROTECTED] 07/23/03 02:49PM >>>
How will you make sure that there are no active segments in your
current
rollback segments before you remove the datafiles with the OS? Even
after
you take the rollback segments off-line, Oracle will continue to use
them
as long as they have an active segment.
BTW --- One way to help to avoid the ORA-01555 when you are committing
across an open cursor is to take the rollback segment that that cursor
is
using off-line. No one else will come in a step on the "free" segment
but
your session will continue to process just fine until you close the
cursor.
At least that's been my experience.
DENNIS WILLIAMS
<DWILLIAMS To: Multiple
recipients of list ORACLE-L <[EMAIL PROTECTED]>
@LIFETOUCH.COM> cc:
Sent by: Subject: RE: convert RBS
tablespace from DMT to LMT (Oracle 8173) steps?
ml-errors
07/23/2003 02:29
PM
Please respond
to ORACLE-L
Guang
Yes, I noticed that after I posted my reply. Typically if this was
a
production system I would tend to create new rollback segments, online
the
new segments, offline the old segments, then change the init.ora.
Sometime
later I would drop the old segments and tablespace, maybe after a
backup
cycle has occurred. Now, you will say that is unnecessary, and
technically
you would be right. But one of the rules you learn by being a DBA for
a
long
time is to never delete anything until you are absolutely certain you
won't
need it. Always have a rollback plan (no pun intended). It is also a
good
idea to back up the control file to trace anytime you make changes in
database structure. With my method, if you have one of those "oh crap"
moments, you can quickly recover. This may be overkill in this
specific
instance, but there are many other circumstances where you may end up
being
awfully glad you were a little cautious.
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Wednesday, July 23, 2003 1:14 PM
To: Multiple recipients of list ORACLE-L
Do I need to? I thought after all the steps I still have the same
rollback
segment names (RBS01-06). The only difference is they will be in LMT
now.
Guang
-----Original Message-----
DENNIS WILLIAMS
Sent: Wednesday, July 23, 2003 1:35 PM
To: Multiple recipients of list ORACLE-L
Guang - Don't forget to update your init.ora!
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Wednesday, July 23, 2003 12:24 PM
To: Multiple recipients of list ORACLE-L
Hi:
I need to convert RBS tablespace (used for rollback segments) from DMT
to
LMT on a 24x7 production machine (Solaris 2.8, Oracle 8173). Here are
the
steps I am thinking of taking:
1. create a new rbslmt tablespace
2. create new rollback segments (RBSlmt01, RBSlmt02, ... RBSlmt 06) in
rbslmt ts , set them online
3. alter all old rollback segments (RBS01, ... RBS06) offline;
4. Drop all old rollback segments;
5. alter old RBS tablespace offline
6. Drop old RBS tablespace
7. Remove old RBS tablespace's datafiles from OS
8. Create new RBS tablespace as LMT
9. Create new rollback segments (RBS01, ... RBS06) in RBS, set them
online;
10. alter rollback segments (RBSlmt01, RBSlmt02, ... RBSlmt 06)
offline,
then drop them;
11. alter tablespace rbslmt offline
12. drop tablespace rbslmt
13. Remove tablespace rbslmt's datafiles from OS.
Anything I am missing?
TIA.
Guang
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