UNDO__RETENTION is set to 1000 and retention is not guaranteed.
You configure the database with a fixed size undo tablespace.
Which is true about undo retention in this configuration?
A.
Undo expires after 1000 seconds and is deleted.
B.
Inactive undo is retained for 1000 seconds even if new transactions fail due to lack of space in
the undo tablespace.
C.
Inactive undo is retained for at least 1000 seconds if free undo space is available.
D.
Undo is retained in the UNDO tablespace for 1000 seconds, and then moved to the SYSAUX
tablespace to provide read consistency.