doesn't sound like you are doing anything stupid, and I ran on 8.1.6.0
and it said it would shrink it but didn't. I'll use your test case
against my databases in the morning
- "Johnston, Tim" <TJohnston_at_quallaby.com> wrote:
> Ok... I've ran this test case on both a 8.1.6.0 and a 8.1.7.3
> database...
> I've ran it with both public and private rollback segments (just in
> case)...
> I've looked at rssize in v$rollstat and sum(bytes) from
> dba_segments...
> And, in all cases, it allows me to shrink the segment to less then
> both
> optimal and min_extents*extent_size even though
> optimal=min_extents*extent_size... Is there something wrong in the
> test
> case? Has anyone ran this on one of their test databases? I'm
> confused
> since the test case seems straight forward... The way I read, it
> allows me
> to perform the shrink and the resulting segment is actually the size
> I
> specify... Am I doing something stupid in the test case?
>
> Thanks
> Tim
>
> PS - Here is the test case again...
>
> column segment_name format a30
> create public rollback segment tim tablespace rbs storage ( initial
> 1M next
> 1M minextents 20 maxextents 100 optimal 20M );
> alter rollback segment tim online;
> select segment_name, min_extents, initial_extent, next_extent
> from dba_segments
> where segment_name = 'TIM';
> select rs.extents, rs.rssize/1048576 , rs.optsize/1048576
> from dba_rollback_segs drs,
> v$rollstat rs
> where drs.segment_name = 'TIM'
> and drs.segment_id = rs.usn;
> alter rollback segment TIM shrink to 10M;
> select segment_name, min_extents, initial_extent, next_extent
> from dba_segments
> where segment_name = 'TIM';
> select rs.extents, rs.rssize, rs.optsize
> from dba_rollback_segs drs,
> v$rollstat rs
> where drs.segment_name = 'TIM'
> and drs.segment_id = rs.usn;
> alter rollback segment tim offline;
> drop rollback segment tim;
>
> -----Original Message-----
> Sent: Wednesday, January 30, 2002 2:31 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Um... Must be version differences... Here is a test case I ran on
> my
> 8.1.7.3 machine...
>
> SQL> create public rollback segment tim tablespace rbs storage (
> initial 1M
> next 1M minextents 20 maxextents 100 optimal 20M );
>
> Rollback segment created.
>
> SQL> alter rollback segment tim online;
>
> Rollback segment altered.
>
> SQL> select segment_name, min_extents, initial_extent, next_extent
> 2 from dba_segments
> 3 where segment_name = 'TIM';
>
> SEGMENT_NAME MIN_EXTENTS INITIAL_EXTENT NEXT_EXTENT
> ------------------------------ ----------- -------------- -----------
> TIM 20 1048576 1048576
>
> SQL> select rs.extents, rs.rssize/1048576 , rs.optsize/1048576
> 2 from dba_rollback_segs drs,
> 3 v$rollstat rs
> 4 where drs.segment_name = 'TIM'
> 5 and drs.segment_id = rs.usn;
>
> EXTENTS RS.RSSIZE/1048576 RS.OPTSIZE/1048576
> ---------- ----------------- ------------------
> 20 20.296875 20
>
> SQL> alter rollback segment TIM shrink to 10M;
>
> Rollback segment altered.
>
> SQL> select segment_name, min_extents, initial_extent, next_extent
> 2 from dba_segments
> 3 where segment_name = 'TIM';
>
> SEGMENT_NAME MIN_EXTENTS INITIAL_EXTENT NEXT_EXTENT
> ------------------------------ ----------- -------------- -----------
> TIM 20 1048576 1048576
>
> SQL> select rs.extents, rs.rssize, rs.optsize
> 2 from dba_rollback_segs drs,
> 3 v$rollstat rs
> 4 where drs.segment_name = 'TIM'
> 5 and drs.segment_id = rs.usn;
>
> EXTENTS RSSIZE OPTSIZE
> ---------- ---------- ----------
> 10 10633216 20971520
>
> SQL> alter rollback segment tim offline;
>
> Rollback segment altered.
>
> SQL> drop rollback segment tim;
>
> Rollback segment dropped.
>
> SQL>
>
> What version is your test running on?
>
> Tim
>
> PS - Here is my test case if you want to run it...
>
> column segment_name format a30
> create public rollback segment tim tablespace rbs storage ( initial
> 1M next
> 1M minextents 20 maxextents 100 optimal 20M );
> alter rollback segment tim online;
> select segment_name, min_extents, initial_extent, next_extent
> from dba_segments
> where segment_name = 'TIM';
> select rs.extents, rs.rssize/1048576 , rs.optsize/1048576
> from dba_rollback_segs drs,
> v$rollstat rs
> where drs.segment_name = 'TIM'
> and drs.segment_id = rs.usn;
> alter rollback segment TIM shrink to 10M;
> select segment_name, min_extents, initial_extent, next_extent
> from dba_segments
> where segment_name = 'TIM';
> select rs.extents, rs.rssize, rs.optsize
> from dba_rollback_segs drs,
> v$rollstat rs
> where drs.segment_name = 'TIM'
> and drs.segment_id = rs.usn;
> alter rollback segment tim offline;
> drop rollback segment tim;
>
> -----Original Message-----
> Sent: Wednesday, January 30, 2002 2:17 PM
> To: Multiple recipients of list ORACLE-L
>
>
> testing....
>
> if the initial extent*min_extents is less than the optimal, yes you
> can
> shrink below optimal.
>
> if initial*minextents = optimal, you can execute an alter rollback
> segment statement that lists a shrink size that is less than optimal
> AND less than initial*minextents and it will not fail. But if you
> LOOK
> at the size it shrinks to, it's initial*minextents.
>
> so you can "kinda" shrink below optimal, the statement won't fail,
> but
> Oracle will ignore the number you give it.
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Johnston, Tim
> INET: TJohnston_at_quallaby.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing
> Lists
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--
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--
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Received on Wed Jan 30 2002 - 20:04:06 CST
