Segment Shrink Space Compact option in Oracle 10g

Dear All,
1. Is it Compulsory to run the Segment Shrinking Jobs advised by Segment Advisor?
2. Running online will it affect the perfomance
3. Is this same as table re organization
Thanks in Advance

1. NO. As with any "Advisor" it is your discretion and decision as to what action to take and when. I would schedule shrinks / rebuilds / reorgs during/without maintenance/outages. But first, I would evaluate the advice. In many cases, it wouldn't be worth the effort to rebuild/shrink. Also, you have to consider that the table/index may/will grow again.
I do a shrink/rebuild only as part of any archival job which deletes a significant portion of the data. Not otherwise.
2. Running it online will impact performance. Furthermore, the SHRINK actually generates a lot of Undo (as it runs as if it is normal DML) and, consequently, Redo and ArchiveLog.
3. It is different. However, the "it" also depends on what you mean to be a "table reorganization". A reorganization that is done with an ALTER TABLE MOVE (and ALTER INDEX REBUILD) is quite a different operation from a SHRINK. A DBMS_REDEFINITION is also a very different operation.

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from last couple of days i was very busy with my oracle 10g box,so i think this is right time to
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Have a look :-
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Oracle 10g Memory and Storage Feature.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.Automatic Memory Management.
2.Online Segment Shrink
3.Redolog Advisor, checkpointing
4.Multiple Temporary tablespace.
5.Automatic Workload Repository
6.Active Session History
7.Misc
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c)Internal Structure of Controlfile
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================================
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JAVA_POOL
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==========================
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Exp/imp
or
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================================================================
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==================================
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BEGIN
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SQL*Plus: Release 10.1.0.2.0 - Production on Fri Mar 17 10:37:22 2006
Copyright (c) 1982, 2004, Oracle. All rights reserved.
Connected to:
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Current Instance
~~~~~~~~~~~~~~~~
DB Id DB Name Inst Num Instance
4174002554 RMSORA 1 rmsora
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~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DB Id Inst Num DB Name Instance Host
* 4174002554 1 RMSORA rmsora RMSORA1
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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rmsora RMSORA 16186 16 Mar 2006 17:33 1
16187 16 Mar 2006 18:00 1
16206 17 Mar 2006 03:30 1
16207 17 Mar 2006 04:00 1
16208 17 Mar 2006 04:30 1
16209 17 Mar 2006 05:00 1
16210 17 Mar 2006 05:31 1
16211 17 Mar 2006 06:00 1
16212 17 Mar 2006 06:30 1
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16214 17 Mar 2006 07:30 1
16215 17 Mar 2006 08:01 1
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 16216
Begin Snapshot Id specified: 16216
Enter value for end_snap: 16217
End Snapshot Id specified: 16217
Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
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Benefit:- Now DBA have more free time to play games.....................:-)
Advance version of statspack
more DB and OS information with self managing capabilty
New Automatic alert and database advisor with the help of AWR.
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==========================
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~SQL identifier of SQL statement
~Object number, file number, and block number
~Wait event identifier and parameters
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~Client identifier of the session
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========
Rename Tablespace:-
=================
in 10g,we can even rename a tablespace by
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Bigfile tablespace:-
====================
Bigfile tablespace contain only one datafile.
A bigfile tablespace with 8K blocks can contain a 32 terabyte datafile.
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syntax:-
CREATE BIGFILE TABLESPACE bigtbs
Flushing Buffer Cache:-
======================
This option is same as flushing the shared pool,but only available with 10g.
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SQL> alter system flush buffer_cache;
System altered.
++++++++++++++++++
8.Oracle Internal
++++++++++++++++++
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++++++++++++++++++++++++
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++++++++++++++++
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lock memory at startup MMAN
Memory Management MMAN
Handle sga_target resize MMAN
Reset advisory pool when advisory turned ON MMAN
Complete deferred initialization of components MMAN
lock memory timeout action MMAN
tune undo retention MMNL
MMNL Periodic MQL Selector MMNL
ASH Sampler (KEWA) MMNL
MMON SWRF Raw Metrics Capture MMNL
reload failed KSPD callbacks MMON
SGA memory tuning MMON
background recovery area alert action MMON
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tablespace alert monitor MMON
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RVWR IO's RVWR
kfcl instance recovery SMON
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++++++++++++++++++++++++++++++++++++
The contents of the current controlfile can be dumped in text form.
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4 as above, but includes the 4 most recent records for circular reuse record types
5+ as above, but the number of circular reuse records included doubles with each level
the session must be connected AS SYSDBA
alter session set events 'immediate trace name controlf level 5';
This dump show lots of intresting information.
it also show rman recordes if we used this controlfile in rman backup.
Thanks
Kuljeet Pal Singh

You can find each doc in html and pdf format on the Documentation Library<br>
You can too download all the documentation in html format to have all on your own computer here (445.8MB)<br>
<br>
Nicolas.

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Hello,
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Now it takes too much time to perform this operation because of TABLE fragmented.How do you define "fragmented"?
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1) move table within the same tablespace
2) shrink the table
3) exp/imp
.......

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@ Oracle software is installed ok. Already created a database succesfully. I have now deleted that database and am creating a new one using dbca.
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Segment Shrink Space Compact option in Oracle 10g

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