RECOVERY_CHECKPOINT | 
DATE | 
Point in time to which the recovery has occurred. If no logs have been applied, this is the point in time the recovery starts. | 
THREAD | 
NUMBER | 
Number of the redo thread currently being processed | 
SEQUENCE_NEEDED | 
NUMBER | 
Log sequence number of the log needed by the recovery process. The value is 0 if no log is needed. | 
SCN_NEEDED | 
VARCHAR2(16) | 
Low SCN of the log needed by recovery. The value is 0 if unknown or no log is needed. | 
TIME_NEEDED | 
DATE | 
Time when the log was created. The value is midnight on 1/1/88 if the time is unknown or if no log is needed. | 
PREVIOUS_LOG_NAME | 
VARCHAR2(513) | 
Filename of the log | 
PREVIOUS_LOG_STATUS | 
VARCHAR2(13) | 
Status of the previous log. Contains one of the following values: RELEASE; WRONG NAME; MISSING NAME; UNNEEDED NAME; NONE | 
REASON | 
VARCHAR2(13) | 
Reason recovery is returning control to the user (NEED LOG|LOG REUSED|THREAD DISABLED) |