Committed SCN in Undo header slot (Transaction table )

Hi ,
When ever a transaction was committed the Committed SCN is recorded with the Change vector in redo logs and in Slot reserved for this transaction in undo segment header .
At some later point in time another session may read one of those blocks and discover that the ITL includes a transaction that has committed but not been cleaned out. (It
can work this out by cross-checking the ITL entry with the relevant transaction table slot in the undo segment header block).
My Question is : By the time next session visit this block, what happens if the undo slot was over written (This may happens due to lack of undo space and or the the time after commit reached undo retention ) .
Please clarify my doubts ?
-thanks
Vijay

Vijay.Cherukuri wrote:
thanks for your reply
Possibly: ORA-01554 transaction concurrency limit reached reason:%s params:%s, %s
(ORA-01574 is another candidate, but I think that one really is about just the parameter setting.)
In this case we may also get the error : ORA-30036 : unable to extend segment by string in undo tablespace 'string' Sine the undo table space was full not extendable. ?
And also : ORA-01554 transaction concurrency limit reached reason:%s params:%s, %s also valid Since the Maximum number of concurrent transactions reached
Which error code more likely to occur in this case ?
Why do you think you need to know the answer to that question ?
Regards
Jonathan Lewis

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say we start a transaction, and then we want to read a value, and that value has not been changed since our transaction started, but it is in a data block where another row in it has been changed since our transaction started.
So Oracle will see that that block's SCN is later than our transactions, and so it will go to the undo segment. This makes no sense to me.
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OracleGuy777 wrote:
hi,
say we start a transaction, and then we want to read a value, and that value has not been changed since our transaction started,This means that the block's transaction header has not recorded any active transaction and there is no Transaction SCN assigned within it. Whatever is there in the block, it can be read as it is without any kind of modifications done over it.
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>
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