Oracle
logs & Trace Files:
1. Alert Log (alert_SID.log):
Location:
/oracle/SID/saptrace/background
Log
consist of instance activity such as startup, shutdown, switch logfile, parameter change, error etc.
2. Trace File
(*.trc):
2 types of
Trace Files:
System
trace--> /oracle/SID/saptrace/background
User Trace --> /oracle/SID/saptrace/usertrace
Normally
the error logs globally mentioned in the alert log & more details are
written in trace files.
SQL>
show parameter user_dump_dest;
3. Core Dump
File:
Location:
/oracle/SID/saptrace/background
Like core
dump in OS. When there are issues related to configuration of OS such as,
accessibility,
oracle storage usually make core dump.
SQL>
show parameter core_dump_dest;
4. Audit File
(ora_OSID.aud):
It
contains connection history from user sysdba (sys) & user audit activity
for AUDIT_TRAIL = OS.
If the
file system, where audit_file_dest is full, we could not login with sysdba user
(sys).
SQL>
show parameter audit_file_dest;
5. Network
log (listener.log):
Location :
/oracle/SID/102_64/network/log
Contains network
related logs.