Log files are useful in troubleshooting issues in Oracle Applications. Here is the list of Log file location in Oracle Applications for Startup/Shutdown, Cloning, Patching, DB & Apps Listener and various components in Apps R12/12i:

A. Startup/Shutdown Log files for Application Tier in R12

Instance Top is new TOP added in R12 (to read more click here)

–Startup/Shutdown error message text files like adapcctl.txt, adcmctl.txt…
$INST_TOP/apps/$CONTEXT_NAME/logs/appl/admin/log

–Startup/Shutdown error message related to tech stack (10.1.2, 10.1.3 forms/reports/web)
$INST_TOP/apps/$CONTEXT_NAME/logs/ora/  (10.1.2 & 10.1.3)
$INST_TOP/apps/$CONTEXT_NAME/logs/ora/10.1.3/Apache/error_log[timestamp]
$INST_TOP/apps/$CONTEXT_NAME/logs/ora/10.1.3/opmn/ (OC4J~…, oa*, opmn.log)$INST_TOP/apps/$CONTEXT_NAME/logs/ora/10.1.2/network/ (listener log)
$INST_TOP/apps/$CONTEXT_NAME/logs/appl/conc/log  (CM log files)

B. Log files related to cloning in R12

Preclone log files in source instance
i) Database Tier - /$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/(StageDBTier_MMDDHHMM.log)

ii) Application Tier - $INST_TOP/apps/$CONTEXT_NAME/admin/log/ (StageAppsTier_MMDDHHMM.log)

Clone log files in target instance

Database Tier - $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ApplyDBTier_<time>.log
Apps Tier  - $INST_TOP/apps/$CONTEXT_NAME/admin/log/ApplyAppsTier_<time>.log

—–
If your clone on DB Tier fails while running txkConfigDBOcm.pl  (Check metalink note - 415020.1)
During clone step on DB Tier it prompts for “Target System base directory for source homes” and during this you have to give like /base_install_dir like ../../r12 and not oracle home like ../../r12/db/tech_st_10.2.0
—–

C. Patching related log files in R12

i) Application Tier adpatch log - $APPL_TOP/admin/$SID/log/
ii) Developer (Developer/Forms & Reports 10.1.2) Patch - $ORACLE_HOME/.patch_storage
iii) Web Server (Apache) patch - $IAS_ORACLE_HOME/.patch_storage
iv) Database Tier opatch log - $ORACLE_HOME/.patch_storage

D. Autoconfig related log files in R12
i) Database Tier Autoconfig log :
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/MMDDHHMM/adconfig.log
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/MMDDHHMM/NetServiceHandler.log

ii) Application Tier Autoconfig log -  $INST_TOP/apps/$CONTEXT_NAME/admin/log/$MMDDHHMM/adconfig.log

Autoconfig context file location in R12 - $INST_TOP/apps/$CONTEXT_NAME/appl/admin/$CONTEXT_NAME.xml

E. R12 Installation Logs

Database Tier Installation

RDBMS $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/<MMDDHHMM>.logRDBMS $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ApplyDBTechStack_<MMDDHHMM>.logRDBMS
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ohclone.logRDBMS $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/make_<MMDDHHMM>.logRDBMS
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/installdbf.logRDBMS $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/adcrdb_<SID>.log RDBMS
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/ApplyDatabase_<MMDDHHMM>.logRDBMS $ORACLE_HOME/appsutil/log/$CONTEXT_NAME/<MMDDHHMM>/adconfig.log    RDBMS
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME/<MMDDHHMM>/NetServiceHandler.log

Application Tier Installation

$INST_TOP/logs/<MMDDHHMM>.log
$APPL_TOP/admin/$CONTEXT_NAME/log/ApplyAppsTechStack.log
$INST_TOP/logs/ora/10.1.2/install/make_<MMDDHHMM>.log
$INST_TOP/logs/ora/10.1.3/install/make_<MMDDHHMM>.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_<MMDDHHMM>.log
$APPL_TOP/admin/$CONTEXT_NAME/log/<MMDDHHMM>/adconfig.log
$APPL_TOP/admin/$CONTEXT_NAME/log/<MMDDHHMM>/NetServiceHandler.log

Inventory Registration:

$Global Inventory/logs/cloneActions<timestamp>.log
$Global Inventory/logs/oraInstall<timestamp>.log
$Global Inventory/logs/silentInstall<timestamp>.log

F. Other log files in R12
1) Database Tier
1.1) Relink Log files :
$ORACLE_HOME/appsutil/log/$CONTEXT_NAME /MMDDHHMM/ make_$MMDDHHMM.log

1.2) Alert Log Files :
$ORACLE_HOME/admin/$CONTEXT_NAME/bdump/alert_$SID.log

1.3) Network Logs :
$ORACLE_HOME/network/admin/$SID.log

1.4) OUI Logs :
OUI Inventory Logs :
$ORACLE_HOME/admin/oui/$CONTEXT_NAME/oraInventory/logs

2) Application Tier
$ORACLE_HOME/j2ee/DevSuite/log
$ORACLE_HOME/opmn/logs
$ORACLE_HOME/network/logs

Tech Stack Patch 10.1.3 (Web/HTTP Server)
$IAS_ORACLE_HOME/j2ee/forms/logs
$IAS_ORACLE_HOME/j2ee/oafm/logs
$IAS_ORACLE_HOME/j2ee/oacore/logs
$IAS_ORACLE_HOME/opmn/logs
$IAS_ORACLE_HOME/network/log
$INST_TOP/logs/ora/10.1.2
$INST_TOP/logs/ora/10.1.3
$INST_TOP/logs/appl/conc/log
$INST_TOP/logs/appl/admin/log

If I missed any important log file name/location, drop a line via comment

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