R12 architecture

R12 Architecture
----------------


In this post I am going to cover R12 architecture. Discernible change from its predecessors is INST_TOP.

R12 file system has come up with new model - Code, Data, Configurations are segregated nicely to have easy maintenance, to avert NFS mount issues on shared appltier configuration systems. Autoconfig will not write anything in appltop, commontop area in R12. All instance specific configurations, log files are written in INST_TOP area. Instance Home provides the ability to share Applications and technology stack code among multiple instances. I have highlighted the INST_TOP in the box. In the forthcoming posts I will clearly explain the in depth of INST_TOP(As a DBA you will spend much time in INST_TOP area when you comes to application tier node management ( e.g checking logs, starting/stopping services, ssl certificates management, CONTEXT_FILE modification etc.)

Techstack Components:

DB_TIER:
10.2.0.2 RDBMS ORACLE_HOME

APPL-TIER

10.1.2 C ORACLE_HOME / FORMS ORACLE_HOME (8.0.6 ORACLE HOME equivalence)
10.1.3 Java ORACLE_HOME/OC4J ORACLE_HOME (iAS ORACLE_HOME equivalence)

INST_TOP
---------

I have briefed R12 architecture in my last post( R12 architecture ).
I described that INST_TOP is the most descernible changes that R12 is having from its predecessors. I am going to cover INST_TOP here.

INST TOP directory:

(applmgr) - ls
admin/ appl/ certs/ logs/ ora/ out/ pids/ portal/ rgf/
(applmgr) -

The Whys and wherefores:

You may get a question why is the change??

There is a need to separate

Code
Data
Config

to ease maintenance of the system. To avoid NFS/MUTEX related issues. Above issue will get resolved if the configuration/lcck files are stored in local system. Another advantage is to gain performance accessing local file system is better than NFS file system.

This directory $INST_TOP got introduced newly in R12. Instance top contains all the config files, log files, ssl certificates, document root etc. Addition of this directory makes the middle-tier more organised, since data is kept separate from config/log files. Another advantage is that, multiple instances can easily share the same middle tier. To create a new instance that shares an existing middle-tier, just create a new instance_top with proper config files and NFS mount the middle tier in the server.


$INST_TOP: APPS_BASE/inst/apps/CONTEXT_NAME/

/admin



/scripts

ADMIN_SCRIPTS_HOME: Find all AD scripts here

/appl

APPL_CONFIG_HOME. For standalone envs, this is set to $APPL_TOP

/fnd/12.0.0/secure

FND_SECURE: dbc files here

/admin

All Env Config files here

/certs

SSL Certificates go here

/logs

LOG_HOME: Central log file location. All log files are placed here (except adconfig)

/ora

ORA_CONFIG_HOME

/10.1.2

'C' Oracle home config, Contains tnsnames and forms listener servlet config files

/10.1.3

Apache & OC4J config home, Apache, OC4J and opmn
This is the 'Java' oracle home configuration for OPMN, Apache and OC4J

/pids

Apache/Forms server PID files here

/portal

Apache's DocumentRoot folder

AD Scripts
------------


$ADMIN_SCRIPTS_HOME: $INST_TOP/admin/scripts
adautocfg.sh
run autoconfig
adstpall.sh
stop all services
adstrtal.sh
start all services
adapcctl.sh
start/stop/status Apache only
adformsctl.sh
start/stop/status OC4J Forms
adoacorectl.sh
start/stop/status OC4J oacore
adopmnctl.sh
start/stop/status opmn
adalnctl.sh
start/stop RPC listeners (FNDFS/FNDSM)
adcmctl.sh
start/stop Concurrent Manager
gsmstart.sh
start/stop FNDSM
jtffmctl.sh
start/stop Fulfillment Server
adpreclone.pl
Cloning preparation script
adoafmctl.sh adoafmctl.sh to start/stop/status OC4J oafm
(webservice, mapviewer)
adexecsql.pl
Execute sql scripts that update the profiles in an AutoConfig run
java.sh
Call java executable with additional args, (used by opmn, Conc. Mgr)



Log Files
-------------

Location of various log files
AD Script log files (adapcctl.sh,...)
$INST_TOP/logs/appl/admin/log
CM Log Files ($APPLCSF/$APPLLOG)
$INST_TOP/logs/appl/conc/log
AD tools log files (adpatch, ...)
$APPL_CONFIG_HOME/admin/$TWO_TASK/log
OPMN Log Files (Text & ODL)
$INST_TOP/logs/ora/10.1.3/opmn
Apache Log Files (Text & ODL)
$INST_TOP/logs/ora/10.1.3/Apache
OC4J Log Files (Text)
$INST_TOP/logs/ora/10.1.3/j2ee/oacore/
OC4J Log Files (ODL)
$INST_TOP/logs/ora/10.1.3/j2ee/oacore/log/oacore_default_group_1/oc4j


Certificates
------------------

$INST_TOP/certs

/Apache/ewallet.p12

/opmn/cwallet.sso

/opmn/ewallet.p12

certs is the default directory for SSL or any other certificate files
used by this instance. To use a centrally staged certificate, change
the appropriate context file and run autoconfig