A Question about Oracle undo Tablespace

Dear Experts,

Can you simply explain me usage of undo Tablespace of Oracle Database?

My Oracle Database version is 10.2 and it has 8GM undo Tablespace. Every time, once I check it, it fill up with more than 95% with data.

How can I get increased the free space of undo Tablespace?
Pradeep SiriwardanaSystems EngineerAsked:
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johnsoneSenior Oracle DBACommented:
I wouldn't worry about the undo tablespace.  Oracle manages that on its own.  Are you getting any errors?  Specifically ORA-01555?  That would indicate that you may need to change your parameters or increase the size of undo.
DavidSenior Oracle Database AdministratorCommented:
UNDO hold the uncommitted transactions; as johnsone points out, it's not a significant tuning issue UNLESS it's too small.  If you will search E-E for oracle undo you'll find a good number of previous answers (and save your points that way).  Also, obviously, the docs.oracle.com for the RTFM sources.  Try as a start:

http://www.experts-exchange.com/Database/Oracle/Q_23314493.html

HTH,
dvz

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Praveen Kumar ChandrashekatrDatabase Analysist Senior Commented:
As in previous post the undo tablespace is manages automatically by oracle.

check the below docs for more info on undo.

http://asktom.oracle.com/pls/apex/f?p=100:11:0::NO::P11_QUESTION_ID:6894817116500

http://www.dba-oracle.com/t_undo_tablespace_size_shrink.htm

http://www.orafaq.com/node/61
DavidSenior Oracle Database AdministratorCommented:
I'm pleased to have helped; the "B" grade suggests I was deficient in some manner.  How could I have improved your satisfaction?
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