What is the difference between the Oracle database server and Oracle application server?
What is commonly referred to as the Oracle Server (or in your case, the Oracle database server) is really just the database. This is called a Database Management System, DBMS. The DBMS lets you store data for quick, easy retrieval.
Oracle Application Server (OAS) is Oracle Corporation's software which lets you develop and deploy database applications. The deployment method is through the Web. OAS uses Apache as the basis for its Web server. Users point their Web browser to the OAS to access the application. OAS then makes the connection to the database for the user and runs the application for them.
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