R12 Applications File System

Hi,
Few days back I have posted about the 3-tiers 1)Destop 2)Application 3)Database,
I'm continuing with R12 application filesystem in this post.


II)Applications File System– Overview

The Top-Level R12-Applications Directory Structure is divided into 3 parts:
1)Database Server files
2)Instant specific files
3)Application tier Server


1)Database Server files(db):
• The db/apps_st/data directory is located on the database node machine, and contains the system tablespaces, redo log files, data tablespaces, index tablespaces,and database files
• The db/tech_st/10.2.0 directory is located on the database node machine, and contains the ORACLE_HOME for the Oracle10g database
• The apps/apps_st/appl (APPL_TOP) directory contains the product directories and
files for Oracle Applications.
• The apps/apps_st/comn (COMMON_TOP) directory contains Java classes, HTML
pages, and other files and directories used by multiple products
• The apps/tech_st/10.1.2 directory contains the ORACLE_HOME used for the
Applications technology stack tools components.
• The apps/tech_st/10.1.3 directory contains the ORACLE_HOME used for the
Applications technology stack Java components.

2)Instant specific files(inst):
Instance Home (INST_TOP):

*Oracle Applications Release 12 introduces the concept of a top-level directory for an Applications instance. This directory is referred to as the Instance Home, and denoted by the environment variable $INST_TOP.
*Using an Instance Home provides the ability to share Applications and technology.

Notable features of this architecture include:

• The latest version of Oracle Containers for Java (OC4J), the successor to JServ, is
included in Oracle Application Server 10.1.3.
• All major services are started out of the OracleAS 10.1.3 ORACLE_HOME.
• The Applications modules (packaged in the file formsapp.ear) are deployed into the
OC4J-Forms instance running out of the OracleAS 10.1.3 ORACLE_HOME, while the frmweb executable is invoked out of the OracleAS 10.1.2 ORACLE_HOME.
*stack code among multiple instances, for example a development instance and a test instance.
*Support for read-only file systems and centralization of log files.

3)Application tier Server files(apps):
ORACLE_HOMEs:
There are 3 ORACLE_HOMEs in the Architecture of R12:
One ORACLE Database 10g rel2( Oracle 10.2.0 Home) &
Two ORACLE Application Server(OracleAS Homes)

*Use of Two Oracle Application Server ORACLE_HOMEs in Release 12
Two different Oracle Application Server (OracleAS) 10g releases, in separate ORACLE_HOMEs, are used in Oracle Applications Release 12.
*This enables Oracle Applications to take advantage of the latest Oracle technologies.
• The Oracle Application Server 10.1.3 ORACLE_HOME (sometimes referred to as
the Web or Java ORACLE_HOME) replaces the 8.1.7-based ORACLE_HOME
provided by Oracle9i Application Server 1.0.2.2.2 in Release 11i).


Hope it helps in understanding Oracle R12 Application filesystem.


Best regards,

Rafi.