Oracle error log file
Usually only DBA's have essential rights to view Oracle logs.But,If you have enough rights:
select value from v$parameter twhere t.NAME='background_dump_dest'
This query will return the file path of the Oracle alert log and trace\dump files at Oracle Server machine. Alert log (Alert_"databasename".log) chronologically records messages and errors and containes pointers to trace\dump file assosiated whith them.
Also you can view alert_.log using Oracle Enterprise Managment Console following the "Alert Log Contents" link in the target database.