V$UNDOSTAT

SQL>DESC V$UNDOSTAT

 Name                                     Null?    Type

 ------------------------------------------------- ----------------------------
 BEGIN_TIME                                         DATE
 END_TIME                                            DATE
 UNDOTSN                                           NUMBER
 UNDOBLKS                                          NUMBER
 TXNCOUNT                                          NUMBER
 MAXQUERYLEN                                        NUMBER
 MAXQUERYID                                        VARCHAR2(13)
 MAXCONCURRENCY                                     NUMBER
 UNXPSTEALCNT                                       NUMBER
 UNXPBLKRELCNT                                      NUMBER
 UNXPBLKREUCNT                                      NUMBER
 EXPSTEALCNT                                        NUMBER
 EXPBLKRELCNT                                       NUMBER
 EXPBLKREUCNT                                       NUMBER
 SSOLDERRCNT                                        NUMBER
 NOSPACEERRCNT                                      NUMBER
 ACTIVEBLKS                                         NUMBER
 UNEXPIREDBLKS                                      NUMBER
 EXPIREDBLKS                                        NUMBER
 TUNED_UNDORETENTION                                NUMBER