E. R12 Installation Logs
==========================
Database Tier Installation logs:

$RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/.log $RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ApplyDBTechStack_.log $RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ohclone.log $RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/make_.log
$RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/installdbf.log $RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/adcrdb_.log
$RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ApplyDatabase_.log $RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME//adconfig.log
$RDBMS_ORACLE_HOME/appsutil/log/$CONTEXT_NAME//NetServiceHandler.log
 
Application Tier Installation logs :

$INST_TOP/logs/.log
$APPL_TOP/admin/$CONTEXT_NAME/log/ApplyAppsTechStack.log
$INST_TOP/logs/ora/10.1.2/install/make_.log
$INST_TOP/logs/ora/10.1.3/install/make_.log
$INST_TOP/admin/log/ApplyAppsTechStack.log
$INST_TOP/admin/log/ohclone.log
$APPL_TOP/admin/$CONTEXT_NAME/log/installAppl.log
$APPL_TOP/admin/$CONTEXT_NAME/log/ApplyAppltop_.log
$APPL_TOP/admin/$CONTEXT_NAME/log//adconfig.log
$APPL_TOP/admin/$CONTEXT_NAME/log//NetServiceHandler.log
 
Inventory Registration logs :
/logs/cloneActions.log
/logs/oraInstall.log
/logs/silentInstall.log

F. Other log files in R12
=========================
1) Database Tier
1.1) Relink Log files :
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME // make.log
1.2) Alert Log Files :
$ORACLE_HOME/admin/$CONTEXT_NAME/bdump/alert_$SID.log
NOTE: bdump no longer available in 11g
1.3) Network Logs :
$ORACLE_HOME/network/admin/$SID.log
1.4) OUI Inventory Logs :
$ORACLE_HOME/admin/oui/$CONTEXT_NAME/oraInventory/logs