1- DATA_TOP directory is located on the database server machine, and contains the system tablespaces,data tablespaces, index tablespaces, and database files.
2- The DB directory is located on the database server machine, and contains the ORACLE_HOME for the Oracle9i database.
3- APPL_TOP directory contains the product directories and files for Oracle Applications.
4-The ORA directory contains the ORACLE_HOMEs for the Applications technology stack components.
5- The COMN or COMN_TOP (or COMMON_TOP) directory contains directories and files used across products.
The DATA Directory
1-The DATA file system contains the data (.dbf) files of the Oracle database.
2-Rapid Install installs the system, data, and index files in directories below several mount points on the database server.
DB & ORA Directories
1-Oracle Applications supports linking Applications programs using the tools from a 2nd or 3rd version of the database.
2-ORACLE_HOMEs is Used for backward compatibility.
Application Directory
All Applications files are stored in the APPL directory, it is known as the APPL_TOP directory.
The APPL_TOP directory contains:
1. The core technology files and directories.
2. The product files and directories (for all products).
3. The main applications environment file, called .env on UNIX, and .cmdon Windows.
4. The consolidated environment file, called APPS.env on UNIX, and APPS.cmd on Windows.
Product Directories
1-Each product has its own subdirectory under APPL_TOP.
2-The subdirectories are named in accordance with the product’s standard abbreviation, such as gl for Oracle General Ledger.
3-Within each product directory is a subdirectory that is named using the base Oracle Applications release number, such as 11.5.0.
COMMON_TOP directory contains files used by many different Oracle Applications products, and which may also be used with third-party products.
Oracle Applications reports, they write the log files and temporary files to the log subdirectory of the admin directory, and the output files to the out subdirectory of the admin directory.
html Directory
The OA_HTML environment setting points to the html directory.
The Oracle Applications HTML-based sign-on screen and Oracle HTML-based Applications HTML files are installed here.
java Directory
The JAVA_TOP environment setting points to the java directory. This contains oracle application JAR file and ZIP file
Portal Directory
This contain portal file . portal is a webpage that provide access to post install task that is naccessary for application
Temp Directory
The temp directory is used for caching by some products such as Oracle Reports.
Util Directory
This contains JDE,JRE & Zip utility
Scripts Directory
This contain application teir contral script such as adstrtal.sh & adstpall.sh which are located in sub directory
