where is the oracle 12c logfile?

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I am getting all of the following error first: ORA-12162: TNS:net service name is incorrectly specified When I export the ORACLE_SID,I can run any command and I get the following error: connected to an idle instance Where is the ALERTLOG file in 12C? I can't see any file in ORACLE_HOME/log folder. I am using ubuntu 14.04 BTW. oracle shareimprove this question edited Dec 3 '15 at 10:01 Julien Vavasseur 8,57421736 asked Sep 21 '14 at 11:42 Tamim Addari 136139

I think the question is useful in terms of "where is the log file". But the sub-question about the idle instance should just be removed from this question to improve the quality,no? –Wouter Dec 3 '15 at 9:56 add a comment

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The alert log never has been under ORACLE_HOME/log. It is in $ORACLE_BASE/diag/rdbms/<sid>/<sid>/trace and is named alert_<sid>.log If you don't have $ORACLE_BASE,this typically is equivalent to $ORACLE_HOME/../../.. This is no different in 12c than it was in 11g (or 10g if I recall correctly). You can also use the ADRCI tool: http://docs.oracle.com/database/121/SUTIL/adrci.htm#SUTIL1474 shareimprove this answer answered Sep 21 '14 at 12:15 a_horse_with_no_name 28.8k75488

thanks,I have resolved the error by allocating more memory in sysctl.conf file,Now I can login to the commandline sql,but I cant login to the web EM though,I am posting another question here,can you please help ? –Tamim Addari Sep 21 '14 at 12:42 add a comment

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alert log find better way;------ step 1 select * from v$diag_info; step 2 $ORACLE_BASE/diag/rdbms/<sid>/<sid>/trace and is named alert_<sid>.log or desc v$diag_info Name Null? Type ------------------------------------------------------------------- -------- --------------- INST_ID NUMBER NAME VARCHAR2(64) VALUE VARCHAR2(512) CON_ID NUMBER Quick sql*plus script to get it out -- diag_info -- quick check of the new v$diag_info view that came in with 11 col inst_id form 9999 head inst col name form a25 col value form a60 wrap spool diag_info.lst set lines 120 select * from v$diag_info order by name / spool off INST_ID NAME VALUE CON_ID -------- -------------------- ---------------------------------------------------------------- ------- 1 Diag Enabled TRUE 0 1 ADR Base D:\APP\ORACLE 0 1 ADR Home D:\APP\ORACLE\diag\rdbms\ora122\ora122 0 1 Diag Trace D:\APP\ORACLE\diag\rdbms\ora122\ora122\trace 0 1 Diag Alert D:\APP\ORACLE\diag\rdbms\ora122\ora122\alert 0 1 Diag Incident D:\APP\ORACLE\diag\rdbms\ora122\ora122\incident 0 1 Diag Cdump D:\app\oracle\diag\rdbms\ora122\ora122\cdump 0 1 Health Monitor D:\APP\ORACLE\diag\rdbms\ora122\ora122\hm 0 1 Default Trace File D:\APP\ORACLE\diag\rdbms\ora122\ora122\trace\ora122_ora_7416.trc 0 1 Active Problem Count 0 0 1 Active Incident Count 0

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