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Connor McDonald

Thanks for the question, NagaKrishna.

Asked: March 04, 2017 - 5:02 pm UTC

Last updated: March 05, 2017 - 3:37 am UTC

Version: 11.2.0.4

Viewed 1000+ times

You Asked

Hi Tom,

I have few questions related to undo tablespace.

1)how to startup the database if undo datafile lost and no backup(without undo how uncommitted transactions will be rolled back)

2)In rac if one undo datafile get corrupted,only that instance will affected or all instances?

and Connor said...

1) See this link

https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5669213349582

for a demo, but of course, that one works because we dont have any transactions in flight (we did a 'shutdown' clean)

In a worst case, if your instance did not cleanly shutdown, then it is possible to still get your database open by setting some underscore parameters,(which you would obtain advice on Support on which ones to set) which would let you get your database open so that you could do a full datapump export to load into a new database.

2) It would probably be noticed on the affected instance first, but it *could* have impacts globally, because another instance may request a read over the interconnect from the affected instance.

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