ORA-01555 error.

Under the help from Wenson, the following ora-01555 has been fixed.


Errors in file D:\ora81\RDBMS\TRACE\ORA16184.TRC:
ORA-00604: error occurred at recursive SQL level 1
ORA-01555: snapshot too old: rollback segment number with name "" too small

Fix:

shutdown immeidate
startup mount
recover database
alter database open
or alter database open resetlogs