what's the internal transaction table for....

Giganews Newsgroups
Subject: what's the internal transaction table for....
Posted by:  Ken Quirici (kquiri…@yahoo.com)
Date: Mon, 8 Feb 2010

The 10g discussion of transaction commitment has this:

The internal transaction table for the associated undo tablespace that
the transaction has committed, and the corresponding unique system
change number (SCN) of the transaction is assigned and recorded in the
table.

which the 11g manual corrects to:

The internal transaction table for the associated undo tablespace
RECORDS [my uppercase] that the transaction has committed, etc.

What is this internal transaction table? I can't find reference to it
anywhere else. It seems as though it
would be important in deciding how long to keep rollback segments
around, but I could be wrong there,
since they seem to be kept around forever, or until they get
overwritten, whichever comes first.

Thanks for any illumination!

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