
Different version of Oracle will have different locations of alert log. So, easy way to locate the Oracle alert log is by executing below command.
SQL> show parameter background
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
background_core_dump string partial
background_dump_dest string /oracle/SID/saptrace/diag/rdbm
s/sid/SID/trace
Look for background_dump_dest parameter value and you can get the Oracle alert log in there!
