Answer by user-251 (google)

1)Check whether database is in ArchiveLog or Noarchive , SQL>archive log list

2)If it is in NoArchive log fllow below steps to enable database into ArchiveLog

3)To set a single location for ARchiveLogs open Parameter file and set the following parameter,

LOG_ARCHIVE_DEST='PATH'

4)Start database in Mount state 5)Here also you can check about the mode of Database

SQL>select log_mode from v$database;

6)To bring database to Archivelog mode

SQL>alter database archivelog;

To bring database to Noarchivelog mode SQL>alter database noarchivelog;

7)Finally Open the database.