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APPS R12 ArchitectureMuhammad Rafi Aamiri Madani on Tuesday, September 7, 2010

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 appl tier configuration systems.

Auto-config will not write anything in APPL_TOP, COMMON_TOP 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.

Tech Stack 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)

• INSTANCE_TOP : Each application tier has a unique Instance Home file system

associated

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INSTANCE TOP – STRUCTURE

$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

Shared Application Tier File System

We can configure multiple application node machines working with a

single E-Business Suite database node. This creation of a “multi-node” E-

Business Suite instance is frequently done to lower cost of ownership

(many small machines are cheaper than one big one), increase faulttolerance (one machine fails, others do not), or scale the instance

(support more users and a greater load).

When configuring Oracle E-Business Suite to use a shared application tier file system, the

application tier node can be configured to perform any of the standard application tier services,

such as Forms, Web, and Concurrent Processing (Batch).

Note the following definitions:

Node

A node/server/instance is a logical set of processes running on one hardware machine. In a single-

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node installation of Oracle E-Business Suite, all the Applications processes (including the database

processes) run on one node, whereas in a multi-node installation, the processes are distributed

across multiple nodes.

A multi-node installation of Release 12 supports both shared and non-shared application tier file

systems. An application tier file system consists of:

• APPL_TOP file system (APPL_TOP and COMMON_TOP directories).

• Application tier technology stack file system (OracleAS 10.1.2 and 10.1.3 Oracle

Homes).

• Instance Home (INST_TOP) file system. Each application tier has a unique Instance

Home file system associated with it.

Service

A service is a functional set of Oracle E-Business Suite application processes running on one or

more nodes. Where applicable, the term ’service’ is replacing the more traditional term of ’server’.

Application Tier Services

The following are the major application tier services:

• Root services

• Web Entry Point services

• Web Application services

• Batch Processing services

• Other services

So if you have two nodes,one will serve as Primary Node and other will serve as Secondry Node.

You can configure both the Application tier node as follows:

Primary Application Tier Node

A primary application tier node is the first application tier node where the APPL_TOP,

COMMON_TOP, OracleAS 10.1.2 Oracle Home and OracleAS 10.1.3 Oracle Home are installed and

configured.

Secondary Application Tier Node

A secondary application tier node is an application tier node where APPL_TOP, COMMON_TOP,

10.1.2 Oracle Home and 10.1.3 Oracle Home are visible and configured. The APPL_TOP,

COMMON_TOP, OracleAS 10.1.2 Oracle Home and OracleAS 10.1.3 Oracle Home file system is

mounted to this node from the primary application tier node, or from an NFS server.

Instance Home

Note : In a shared file system, each application tier will have a unique Instance Home, which

should be located on the local file system.

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Shared Application Tier File System Architecture

In a shared file system, all application tier files (with the specific

exception of the Instance Home file system) are installed on a shared disk

resource, which is mounted on each application tier node. Any application

tier node can be configured to perform any of the standard application tierservices, such as Forms, Web and Concurrent Processing (Batch) services.

All changes made to the shared file system are immediately accessible to

all application tier nodes.

Shared Application Tier File System Layout

When configuring Oracle E-Business Suite to use a shared application tier

file system, an application tier node can be configured to perform any of 

the standard application tier services, such as Forms, Web, or Concurrent

Processing (Batch) services. An application tier will have a unique

Instance Home associated with it that cannot be shared with other

application tiers. You can configure the services running on an application

tier node to match the node’s intended role

Example Shared File System

The following is an example of mount points shared on each application tier node:

• COMMON_TOP: /ebiz/oracle/VIS/apps/apps_st/comn

• APPL_TOP: /ebiz/oracle/VIS/apps/apps_st/appl

• OracleAS 10.1.2 ORACLE_HOME: /ebiz/oracle/VIS/apps/tech_st/10.1.2

• OracleAS 10.1.3 ORACLE_HOME: /ebiz/oracle/VIS/apps/tech_st/10.1.3

In the figure shown below, entitled “Shared Application Tier File System”, Server-appl_node1 is

the primary application tier node, and uses the file systems “/ebiz/oracle/VIS” and

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  “/ebiz/oracle/inst”. The file system “/ebiz/oracle/inst” contains the Instance Home, and “/

ebiz/oracle/VIS ” contains the APPL_TOP, COMMON_TOP, OracleAS 10.1.2 and 10.1.3 Oracle

Home.

Server-appl_node2 is the secondary application tier node, and the shared file system  “/ebiz/oracle/VIS” is also mounted on this node. The file systems

  “/ebiz/oracle/inst/apps/VIS_appl_node1″ and “/ebiz/oracle/inst/apps/VIS_appl_node2″ are only

visible on the respective nodes.

Posted by Muhammad Rafi Aamiri Madani

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