DBMS Fundamentals Quiz

The overall structure of a DBMS typically consists of four main components: the database, DBMS engine, database schema, and database user. The database is where the data is stored, the DBMS engine manages the database and serves as an interface between the database and users, the database schema defines the logical and physical structure of the data, and the database user interacts with the database through the DBMS engine. A diagram typically depicts the relationships and interactions between these components.

A transaction in a DBMS can go through different states: active, partially committed, committed, and aborted. The diagram illustrates how a transaction transitions from one state to another based on its execution and the outcome of the operations it performs.

To create a simple index, you can use a command like 'CREATE INDEX index_name ON table_name(column_name)'. For a composite index, the command would be 'CREATE INDEX index_name ON table_name(column_name1, column_name2)'. To drop the above index, you can use the command 'DROP INDEX index_name'.

<p>SUM = Calculates the total of a numeric column AVG = Calculates the average value of a numeric column MAX = Finds the maximum value in a column MIN = Finds the minimum value in a column</p> Signup and view all the answers

<p>FETCH = Retrieves the current row from the result set OPEN = Executes the query and prepares the result set CLOSE = Releases the resources associated with the cursor DECLARE = Defines a new cursor</p> Signup and view all the answers

<p>External level = User's view of the database Conceptual level = Community view of the database Internal level = Physical storage of data</p> Signup and view all the answers