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oracle 11gr2  update,rollback,undo tablespace, logfile

Posted on 2013-05-23
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Last Modified: 2013-05-23
When I update a table that impact 10,000+ rows,
How the undo tbs  handle this?
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Question by:taaz
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LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 39190644
What information are you looking for?

The docs have just about everything you need on undo.

I suggest you start here:
http://docs.oracle.com/cd/E11882_01/server.112/e10897/storage.htm#ADMQS063
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Assisted Solution

by:Alexander Eßer [Alex140181]
Alexander Eßer [Alex140181] earned 100 total points
ID: 39190748
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Author Comment

by:taaz
ID: 39190855
Just to clarify the concept;
I run the update that impacted 1000's of rows and changed data.
Before change data image is recorded in the undo tbs.
Any data change is also recorded in the logfile.

I do not commit and run the rollback

how oracle will react to this?
if undo tbs was not able to record all the before change image.
what happen to the data that is recorded in the logfile?
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LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 400 total points
ID: 39190890
>>if undo tbs was not able to record all the before change image.

This cannot happen so don't worry about it.

For the rest of the information, again, the docs are your friend.

Active Transactions
http://docs.oracle.com/cd/E11882_01/server.112/e25789/transact.htm#autoId9

Rollback of Transactions
http://docs.oracle.com/cd/E11882_01/server.112/e25789/transact.htm#CNCPT1120
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Author Closing Comment

by:taaz
ID: 39190904
Thanks
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