Extent Management in Oracle 8i

Hi all,
i want to ask about extent management in oracle 8i maybe some people here can help me about this. I have some question about extent :
1. Which is better Local Extent Management or Dictionary management.
2. Which is better Many Extents or less extents in a table.
3. How we decide the extent size for a table, is it based by the estimated sized of a table or there is some standard that 1 extent should be hold a number of records.
Thanks For Helping Me.
Monica

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hi guys,
the above got me thinking.
blocks are arrange in extents. The rest is ???? //??? ... . .... ..

flaskvacuum wrote:
hi guys,
the above got me thinking.
blocks are arrange in extents. The rest is ???? //??? ... . .... .. Datafile autoextend (its not datafile auto extent) - It will increase datafile size when all space in datafile is occupied and all its extents are used. So when objects needs to grow, oracle will increase the size of datafile (if autoextend is ON) and allocate extents to objects.
Also see http://docs.oracle.com/cd/B28359_01/server.111/b28310/dfiles003.htm
Tablespace extent management auto - Local managed tablespace will keep the track of extents in Bitmaps. Now creating this type of tablespace you can specify AUTOALLOCATE clause or the UNIFORM clause, AUTOALLOCATE will assign new extents to obejcts of size determine by oracle internally. UNIFORM if specified, oracle will assign uniform size extents to objects. Lets say you have specified 1M of Uniform size, then oracle will assign 1M of new extents to objects, all assigned extents will have same size i.e 1M. But its not the case with Autoallocate.
Autoallocate will determine whats the best extent size which he needs to allocate to segement. Its internal mechanism
http://docs.oracle.com/cd/B19306_01/server.102/b14231/tspaces.htm

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Don't convert. Yes, Oracle provides a procedure to do the conversion, but it ends up creating a horrible 'hybrid' sort of tablespace, certainly unable to use a uniform extent management technique, but not really using a proper autoallocate method either.
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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.
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friends what is the basic difference between extent management and segment management,as we know that segment is a collection of extents then why is it necesassry to manage both??..and what is the need to do so?

saugat chatterjee wrote:
friends what is the basic difference between extent management and segment management,as we know that segment is a collection of extents then why is it necesassry to manage both??..and what is the need to do so?Oracle stores data in it's own logical structure.
Blocks --> Extent --> Segment
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Extent Management in Oracle 8i

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