In a high-traffic web application, what approaches can be used to minimize the load on the database server?
- Connection Pooling, Data Sharding, Denormalization, Partitioning
- Content Delivery Network (CDN), Load Balancing, Caching, Query Optimization
- Database Replication, Vertical Scaling, Horizontal Scaling, Compression
- Stored Procedures, Asynchronous Processing, Logging, Normalization
Approaches like using CDN, load balancing, caching, and query optimization can help minimize the load on the database server in a high-traffic web application.
What is the role of the doHead method in HTTP servlets?
- It handles HEAD requests.
- It is invoked after the doGet method.
- It is used for handling GET requests.
- It processes the HTTP headers.
The doHead method in HTTP servlets is used to process the HTTP headers. It does not have a body, making it suitable for handling requests where only the headers need to be processed without returning a full response body.
When designing a system for reporting purposes, what techniques would you use to ensure minimal impact on the transactional database system?
- Caching, Denormalization, Stored Procedures, Asynchronous Processing
- Data Warehousing, Materialized Views, Scheduled ETL Processes, Read-Only Replicas
- Indexing, Query Optimization, Database Partitioning, Load Balancing
- Vertical Scaling, Horizontal Scaling, Compression, Normalization
Techniques like data warehousing, materialized views, scheduled ETL processes, and read-only replicas can help ensure minimal impact on the transactional database system in a reporting system.
What enables servlets to handle requests asynchronously?
- Asynchronous Servlets
- Event Listeners
- RequestDispatcher
- Servlet Containers
Servlets handle requests asynchronously through the use of Asynchronous Servlets, allowing them to perform tasks concurrently without blocking the processing of other requests.
What is the purpose of the AsyncContext in asynchronous servlets?
- To manage asynchronous operations
- To manage request attributes
- To manage servlet configuration
- To manage session attributes
The purpose of the AsyncContext in asynchronous servlets is to manage asynchronous operations, providing methods for starting and completing asynchronous tasks.
Which interface must be implemented by a servlet for asynchronous processing?
- AsyncListener
- AsyncProcessor
- Asynchronous
- Callable
A servlet must implement the Async interface to support asynchronous processing. This interface provides methods for starting and completing asynchronous tasks.
What method is used to complete the asynchronous process and send a response?
- complete()
- finalize()
- finish()
- sendResponse()
The complete() method is used to complete the asynchronous process and send a response in asynchronous servlets.
How can a servlet determine if an incoming request supports asynchronous processing?
- canAsyncProcess()
- isAsyncRequest()
- isAsyncSupported()
- supportsAsync()
The isAsyncSupported() method is used by a servlet to determine if an incoming request supports asynchronous processing.
How does asynchronous processing in servlets improve server resource utilization?
- Increases server load
- Increases thread blocking
- No impact on thread blocking
- Reduces thread blocking
Asynchronous processing reduces thread blocking, allowing the server to handle more requests without waiting for each to complete, thus improving resource utilization.
What is the role of the AsyncListener in the servlet's asynchronous mode?
- Controlling servlet initialization
- Handling asynchronous errors
- Initiating asynchronous tasks
- Monitoring asynchronous operations
The AsyncListener plays a role in monitoring asynchronous operations, allowing developers to respond to events such as the start and completion of asynchronous tasks or handling errors in asynchronous processing.