Oracle Application Server:-

• Application server replaces the client-side software’s installed on end user terminals.
• The application makes use of data stored on one or more DB server.
• It is a platform for Developing, Deploying and Managing web applications.
• It can be defined as any application with user communications with HTTP. Web applications usually run at least three tiers.

1. DB tiers – [Mange’s access to data].
2. Client tier – [web browser].
3. Application tier – [program logic, SQL calls to DB].

• Processes modeling of web application are three tiers.

1. Client that manage user interface – [web browser].
2. Middle tier that generate interface & issue SQL statement to data tier – [s/w which run in java written code].
3. Data tier that manage data itself – [oracle server].

• Two type of session

1. End user session – [from client to middle tier].
2. DB session – [from middle tier to data tier].

• End usersession establish at connection using HTTP.
• DB sessionwill use user process & server process. 

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