Merge space within database.

Hi,
Our company is moving a production database from one storage subsystem to another, more efficient. Objects within the database are highly fragmanted. The data wihin the database uses about 1TB. If somebody performed a full export and an import to another database, the same data would need less than 600GB. There is an idea to recreate and rebuild all objects during the mentioned maintenance.
Full imp/exp is not an option as it would cause a long database outage what is not acceptable. My idea is to copy the whole database to the new storage, create a new tablesace and perioically (weekly) move several objects to it (using ALTER TABLE... MOVE and ALTER INDEX REUBUILT... TABLESPACE...). When all objects are moved, drop the old tablespace and realese space. Is there any other more convenient way to merge space within database?
The database uses a lot of small, 2GB files. Wouldn't it be better to create a smaller number of bigger files? Would it influence the performance of the database?
Thank you in advance,
Tim

Thank you very much for the reply!
The version that is currently used is 10.1.0.5 (EE).
To be honest mainly indexes are fragmented. We don't suffer from table's data chaining or migration.
I have made a full database export recently (using data pump) and imported it into an other database. In the source database indexes utilize about 500GB whereas in the target only about 300GB. The indexes haven't been rebuilt for ...years. According to many publications, index defragmentation vastly improves overall system performance, especially for queries that use index scans.
As I know during checkpoint the headers of all data files are updated with current SCN. I thought that decreasing the number of data files would decrease the number of writes. That's why I asked about performance differences.
In what way do you consider ASM as the perfect tool for migration?
Regards,
Tim

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'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

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Hi folks!
Does anyone know if there is some way to reference Micosoft Access
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PO Box 764, McLean Towers, Phone: +64 6 834 3360
Shakespeare Road, Napier, New Zealand. Fax: +64 6 834 3369
Providing Integrated Software to the Meat Processing Industry for over 10years
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive <URL:http://pinehurst.sageit.com/listarchive/>

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imran khan wrote:
Hi,
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http://docs.oracle.com/cd/E11882_01/server.112/e25494/tables007.htm#ADMIN11668
>
Why the reuild of indexes using separate tablespace improves performance? is there any specifi reason for it?Its a myth but not actually proven in most cases. Request you to visit Richard Foote blog about this.
>
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Hi;
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