Question

Like in client-server architecture, you have the client (application program), but before it calls any SQL to the SQL engine and DB, it first calls PL/SQL to the PL/SQL engine.

Application program: PL/SQL (client)
PL/SQL engine: SQL (server)
SQL engine (server)
Database (server).
Options:
A. Program, Engine, Database, SQL
B. Client, Server, SQL, PL/SQL
C. Application, PL/SQL, SQL, Database
D. User, Process, Storage, Query

Answer 1

Option C: Application, PL/SQL, SQL, Database is correct. The Application (client) uses PL/SQL to encapsulate SQL commands that are processed by the SQL engine on the database server.

Step-by-step explanation:

Based on the scenario given where an application program first calls PL/SQL to the PL/SQL engine, then PL/SQL interacts with SQL on the SQL engine, and finally the SQL interacts with the database, the sequence representing the relationship between these elements in a client-server architecture can be defined as: Application, PL/SQL, SQL, Database. Thus, the correct answer to the question is Option C: Application, PL/SQL, SQL, Database.

In this structure, the Application (client) issues commands to the PL/SQL engine. The PL/SQL code is executed by the PL/SQL engine, which may involve executing SQL statements. These SQL statements are processed by the SQL engine, which interacts with the database to perform the required operations. This layered approach separates concerns where the PL/SQL engine serves as an intermediary between the client (Application) and the server-side (SQL engine, Database), allowing for more complex procedures, functions, and business logic to be applied before reaching the database.