if you got error ORA-03114 like this
you can simply try to fix by following commands
go to service.msc, restart the service of the instance
after restart the service.
should be able to get in by sqlplus as sysdba
shutdown abort exit
re-login sqlplus as sysdba
startup mount recover database until time '2014-12-27 0:00:00'; -- TODAY's DATE alter database open resetlogs; shutdown; startup;