6 Questions
Explain the overall structure of DBMS with the help of a diagram
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.
Explain the states of a transaction with the help of a diagram
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.
Create a simple and composite index and write the command to drop the above index
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'.
Match the following aggregate functions with their descriptions:
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
Match the following cursor operations with their functionalities:
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
Match the following database components with their roles in the three-level architecture:
External level = User's view of the database Conceptual level = Community view of the database Internal level = Physical storage of data
Test your knowledge of database management systems (DBMS) with this quiz. Learn about the overall structure of DBMS, transaction states, and how to create simple and composite indexes. Challenge yourself with the command to drop an index. Perfect for students and professionals looking to brush up on their DBMS skills.
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