With power comes complexity.
Personally, I can't think of exceptions to that rule. Maybe
someone else can. Sizing rollback segments is usually
a non-issue, but there's always plenty of other stuff going
on to keep me busy. :)
( Watch out, here comes another car analogy, though I
haven't used one in a while )
Driving a car around a race track comes to mind. Anyone
can do it, it's really easy.
Doing so as quickly as a powerful car is capable of is
something else entirely. It takes coordination, skill, knowledge
of the vehicle, the track conditions, the cars ahead of you
and behind you and a slew of other things.
Slow is simple and easy.
Fast is hard and complex.
Anyone can setup SQL Server. ;)
Jared
DENNIS WILLIAMS <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/17/2003 11:15 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: Autoallocate (was Re: LMT monitoring)
Jared - When it comes to comparing databases, a lot comes down to
perception. Oracle would like to market itself to small sites that don't
even have a DBA, otherwise if forfeits those accounts to Microsoft. Now,
when the MS salesperson says "Oracle takes a lot more maintenance, and
nobody knows how to size rollback segments", the Oracle rep can reply "Oh
we
automated that".
Of course, if you feed your family by understanding how Oracle works,
you aren't so eager for them to make it so simple that it takes no
attention
;-)
-----Original Message-----
Sent: Monday, March 17, 2003 11:59 AM
To: Multiple recipients of list ORACLE-L
IME the 'trouble' of managing rollback segments
is grossly exaggerated. They rarely cause me
any trouble.
Only errant programmers cause me problems.
Jared
DENNIS WILLIAMS <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/17/2003 06:28 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
cc:
Subject: RE: Autoallocate (was Re: LMT monitoring)
Alex
If you do not specify the UNDO TABLESPACE when creating the database
then
AUTOEXTEND is set to ON. I was able to alter that to OFF.
The point of the UNDO is that it is automatically managed by Oracle. If
you can't cope with that, or you decide that doesn't work well for you,
then
you can revert to the old manual ROLLBACK segments. I think that few sites
had their rollback segments properly configured, and Oracle has been
criticized for requiring a lot of expert attention compared to other
databases. This is Oracle's attempt to reduce the TCO (Total Cost of
Ownership).
Dennis Williams
DBA, 40%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Sunday, March 16, 2003 10:59 PM
To: Multiple recipients of list ORACLE-L
How about UNDO tablespace in 9.2?
It gets created with "autoallocate", and there is no way to change it or
specify any parameters for undo segments.
Each segment extended as needed, and when shrinked deallocated some
extents
not necessary the last, than allocate new extent.
Alex.
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Wednesday, March 12, 2003 2:22 PM
You do get odd results. The last time I tested on
a clean tablespace, an initial of 65MB gave me
a consistent result which I recall as:
Extent 0 at 8MB
Extents 1 - 56 at 1MB each
Extent 57 at 8MB
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Tuesday, March 11, 2003 6:23 AM
case
when initial_extent < 1m then
case when extents < 16 then next = 64k,
when extents < 80 then next = 1m,
when extents < 200 then next = 8m,
else next = 64m
when initial_extent >= 1m then
case when extents < 64 then next = 1m,
when extents < 184 then next = 8m,
else next = 64m )
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