How to identify the SEGMENT SPACE MANAGEMENT is AUTO turned ON

how to identify the SEGMENT SPACE MANAGEMENT is AUTO turned ON for a particular tablespace.

Hello,
Try:
SELECT tablespace_name, file_name, autoextensible
FROM DBA_DATA_FILES
ORDER BY tablespace_name, file_name;Oops, wrong answer, try:
SELECT tablespace_name, segment_space_management
FROM dba_tablespaces
order by tablespace_name;

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How to identify the trailing spaces in a column

Hi,
How to identify the trailing spaces in a column.
for ex: empno char(5) and i enter 333 then there will be 2 spaces remaining. How to identify that two spaces

One method...
ME_XE?create table test1 (some_char char(5));
Table created.
Elapsed: 00:00:00.11
ME_XE?
ME_XE?insert into test1 values ('HI');
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[pre]

Conversion to segment space management auto

My production databases is 10gR2, tablespaces are created locally managed with segment space management manual.
I wanted to change the segment space management to AUTO.
What is the best way to do this keeping the downtime minimal?
Thanks
S~

A summary.
First, you cannot convert to ASSM. The only mechanism provided is to create a new tablespace with segment space management auto and then move all objects across from their existing tablespace. That is the only conversion mechanism provided or possible.
Second, you probably don't want to convert to ASSM anyway. It is designed to resolve the problem of massive contention for hot blocks on inserts -the kind of thing that will happen in a RAC. In a RAC, ASSM is extremely good news and you'd be mad NOT to use it. But if you don't have a RAC, then the chances of you needing ASSM are much less. If you find particular segments that suffer from insert contention (the symptoms are lots of buffer busy waits and ITL waits), then move those few segments that need the ASSM treatment into specially-created ASSM tablespaces. But don't go doing bulk converts of things that don't need it!
Third, if you are using OMF and ASM, then that's another situation in which ASSM makes a lot of sense: you're automating everything else anyway, so why not use the automatic 'freelists' mechanism, too?
Fourth, ASSM is about how a table knows where its next insert will take place. Extent Management Local/Uniform is all about how a tablespace allocates chunks of space to segments that need it. Completely different technologies.
Fifth, I would always use extent management auto, because do you know what are the "right" extent sizes to allocate to tables? No, I didn't think so. Oracle can work it out for you, though, with no detriment to you, your tables or your performance levels.
Sixth, back on the topic of ASSM, you might find this article useful:
http://www.dizwell.com/prod/node/541

How to change segment space management (to manual)

How do I change the segment space management for a tablespace, from auto to manual
I can find documentation, to create tablespaces, and set them to auto, but nothing yet to change them from auto to manual.

I just found out, that I am confusing 2 subjects here: segment space management, and auto extensibility. My apologies ....... still new with Oracle :-o
Ok, to change autoextend to manual, do I do this on data_file level ? Do I only need to change this on the last datafile of a tablespace ?

Difference between extent management and segment space management

Hello,
Could you tell me the difference between extent management and segment space management interms of datablocks?

After 10g, default tablespace is locally managed and with this creation, your segment's spaces are managed "automatically".
Automatic segment space management is onlyt avaliable to locally managed tablespaces.
The logic of the automatic segment space management is;
For instance, we have a rectangle cube which is totally empty (1 extent - 8 segments - 64 block in default). If we enter a new data to our table, data is stored inside this cube with it's information. (default 8k). If our data must be splitted, check row chaining for further information.
At this point, oracle decides which block is filled with the entered data. It automatically fills the emty blocks. You can use this only if your tablespace is locally managed and your segment space managemet is auto.
On the other hand,
If we create dictionary managed tablespace,
Data is stored in "dictionary" (tables in SYS schema). This is a bit slower than locally managed tablespaces. So filling the extents, segments and blocks will be slow too. You need to specify the PCTUSED, FREELISTS, FREELISTS GROUPS for the storage of the data. If segment space managent is auto, you don't need to define those values.
In summary, locally managed tablespaces with automatic segment space management is Oracle's maybe the most important feature. I am not using dictionary managed tablespaces and i advice don't use it either. In the end, this is an upgrade of using segment spaces much more faster, easier and reliable, trustable.
PS: You will need to check "High Water Mark" for automatic segment space management.

Manual segment space managed tablespaces , How tune?

I use Manual segment space managed tablespaces.
How I can tuning for high performance?
What's advantage and disavantage of Manual segment space managed tablespaces and Auto segment space managed tablespaces?
if I used more data.
I'll use Auto or manual?
Please introduce me.

ASSM deal with freelist, freelist group(RAC) storage parameters. If you use ASSM you dont need to worry about adjusting freelist and group, oracle will automatically deal with it. If you are using manual storage segment management there would no problem unless you you see heavy buffer busy waits on your tables. You may also play with freelist value for tables which have concurrent inserts and access to avoid buffer busy waits.
From oracle 9i Rel 2 onwards, you have segment level statistics to find out which segments causing more buffer busy waits and tune them accordingly. There are other meaning for buffer busy waits, check v$event_name for buffe busy waits and find out the reason code for the cause of buffer busy waits event.
Jaffar

ASSM (Automatic Segment Space Management)

Hi Folks.
I have a severe problem regarding Buffer Busy Waits.
I have deceided to implement ASSM (Automatic Segment Space Management).
Please assist....is the approch OK & how should i apply this in a existing tablespace (pls also specify the syntax & other constraints that should be taken care of)....
Waiting for reply ... & thanks a lot in advance....

ASSM is a good feature to use, but, you need to kill the culprit instaed of simply MOVING ON.
If creating a new tablespace with ASSM, moving objects from Non-ASSM to the new tablespace is a problem, then, think of the following:
First of all, findout which object type is causing BBW, is it rollback/undo header, undo/rollback block, segment headere or what?
You need to review the P3 value(reason code) of BBW wait event.
Try to review the following dynamic views, before you decide to MOVE on.
v$waitstat (segment header)
v$segment_statistics(read the oracle docs. how to use this view and which parameter need to set in order to enable this feature).
Jaffar

Change SEGMENT SPACE MANAGEMENT from manual toAUTO

Hi, how can i to alter tablespace to SEGMENT SPACE MANAGEMENT AUTO ?
only with re-create the tablespace ?
regards
MDF

Hi,
Oracle says :
Your specification at tablespace creation time of your method for managing available space in segments, applies to all segments subsequently created in the tablespace. Also, your choice of method cannot be subsequently altered. Only permanent, locally managed tablespaces can specify automatic segment-space management.
Paolo

Manual segment space management / want to shrink through segment advisor

I am trying to free space from table space , but i can't check the manual segment space manageme tablespaces, only auto segment space management allow me to do so. How i can do that?
any suggestions.

sybrand_b wrote:
Confusion can best be resolved by referring to the official documentation (as opposed to cluttering up this forum full of doc questions with further doc questions).
Is there any particular reason (your boss beats you up when he sees you reading documentation) why you can't be bothered to visit http://tahiti.oracle.com, or do you -mistakingly- think this is an online chatroom, instead of an offline forum?
Sybrand Bakker
Senior Oracle DBAwhat kind of an answer is that? I mean, what is the points of books if docs were everything one ever needed? I have read something in a book that confuses me, and I disagree with, but maybe my understanding is wrong, so that is why I am come here to ask others for their opinion. What is wrong with that?

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morgalr wrote:
I guarantee it is not pretty.Indeed.
I created a Word doc that simply has the word "Blue" in blue, then a space, then the word "Red" in red, all in the default font that Word started with (Times New Roman). The resulting document is 24,064 bytes. It starts off with 80 bytes of various hex values, mostly 0x00.Then 432 bytes of just 0xFF. Then 2048 bytes of various hex values, mostly 0x00. Then the text "Blue Red" (which appears twice more in the file). And so on...
Edited by: jverd on May 10, 2010 8:45 AM

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Segment space management

hai experts
can anyone tell me the reason why system tablespace's segment space management is manual. any link for the description

thanks Jonathan Ferreira
want to know why manual management is made as
default for system tablespace
hen auto space management will reduce the burden of a
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K&M Machine-Fabricating, Inc.

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<div id="suggestPost"><a href="https://www.facebook.com/pages/NYDogWorks/219268038151244?fref=ts" ></a></div>
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     <p><span class="copyrightType"><img src="images/dogpic.jpg" alt="Dog Behavior Therapy" width="183" height="275" class="h_img_float_right" /></span><strong>NYDogWorks L.L.C. is owned and operated by Master Certified Dog Trainer and Behavior Specialist Brian DeMartino. </strong><br />
       <br />
       His training is hands down the best out there. He has become one of the most sought after dog trainers throughout Long Island, Manhattan, & New York.<br />
       <br />
       With over 15 years experience training and rehabilitating some of the toughest cases of dog behaviors. He’s Mastered the Art of teaching top knotch obedience and manners with outstanding results and has developed the most full proof and guaranteed system to fully housebreak any puppy or dog in the shortest amount of time.<br />
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<p><br />
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       <br />
</div>
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     <p><a href="index.html">Home</a> > NY DogWorks - About Certified Dog Trainer Brian DeMartino<br />
       <strong>Serving all of Long Island, Nassau & Suffolk County, Manhattan, Brooklyn & Queens</strong></p>
     </div>
</div>
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      <div id="footermenu">
      <div id="footermenu1">
      </div>
    </div>
   <div class="phoneNumber" id="copyright"> Copyright © 2014 NY DogWorks</div>
     <div class="websiteDesign" id="sitedesigner">Long Island Website Design by <a href="http://www.wetribet.com" title="Wet Ribet" target="_blank" class="medlink">Wet Ribet</a>     </div>
</div>
</div>

You should be able to add the following snippets of css to your stylesheet to fix that.
In the mainstyle.css file, change...
#imgholder {
width: 950px;
margin-top: 0px;
padding: 0px;
margin-right: auto;
margin-left: auto;
to
#imgholder {
width: 950px;
margin-top: 0px;
padding: 0px;
margin-right: auto;
margin-left: auto;
overflow:hidden;

How to identify the SEGMENT SPACE MANAGEMENT is AUTO turned ON

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