Log Files in OBIEE 11g

Login to the URL http://server.domain:7001/em and navigate to:
Farm_bifoundation_domain-> Business Intelligence-> coreapplications-> Dagnostics-> Log Messages
Also refer below for the Log File configuration-
http://obiee10grevisited.blogspot.in/2012/07/log-configuration-11g.html

You will find the available files:

• Presentation Services Log
• Server Log
• Scheduler Log
• JavaHost Log
• Cluster Controller Log
• Action Services Log
• Security Services Log
• Administrator Services Log

However, you can also review them directly on the hard disk. 

The log files for OBIEE components are under <OBIEE_HOME>/instances/instance1/diagnostics/logs.  Specific log files and their location is defined in the following table:

Installation log
<OBIEE_HOME>/logs

nqquery log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIServerComponent/coreapplication_obis1

nqserver log 
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIServerComponent/coreapplication_obis1

servername_NQSAdminTool log 
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIServerComponent/coreapplication_obis1

servername_NQSUDMLExec log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIServerComponent/coreapplication_obis1

servername_obieerpdmigrateutil log (Migration log)
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIServerComponent/coreapplication_obis1

sawlog0 log (presentation)
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIPresentationServicesComponent/coreapplication_obips1

jh log (Java Host)
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIJavaHostComponent\coreapplication_obijh

webcatupgrade log (Web Catalog Upgrade)
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIPresentationServicesComponent/coreapplication_obips1

nqscheduler log (Agents)
<OBIEE_HOME>/instances/instance1/diagnostics/logsOracleBISchedulerComponent/coreapplication_obisch1

nqcluster log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIClusterControllerComponent\coreapplication_obiccs1

ODBC log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OracleBIODBCComponent/coreapplication_obips1

opmn log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OPMN/opmn

debug log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OPMN/opmn

logquery log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OPMN/opmn

service log
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OPMN/opmn

opmn out
<OBIEE_HOME>/instances/instance1/diagnostics/logs/OPMN/opmn

Upgrade Assistant log
 <OBIEE_HOME>Oracle_BI1/upgrade/logs