Reducing the number of database ________ can significantly improve performance in a web application.
- connections
- indexes
- queries
- transactions
Reducing the number of repeated SQL queries can significantly improve performance in a web application.
_________ is a technique used to minimize the cost of repeatedly executing similar SQL queries.
- Caching
- Normalization
- Sharding
- Triggers
Caching is a technique used to minimize the cost of repeatedly executing similar SQL queries by storing the results of expensive operations and returning the cached result when the same operations occur.
In a scenario where a transaction involves multiple SQL queries, how should exceptions be handled to ensure that either all queries succeed or none do?
- Commit each query individually
- Commit the entire transaction only if all queries succeed
- Ignore exceptions and continue with the transaction
- Rollback the entire transaction on any exception
Handling exceptions in a transaction involving multiple SQL queries requires rolling back the entire transaction on any exception to ensure data consistency鈥攅ither all queries succeed, or none do.
A developer is optimizing an application that frequently queries a large database. What strategies should be considered?
- Caching, Database Indexing, Query Optimization, Load Balancing
- Data Sharding, Denormalization, Connection Pooling, Logging
- Partitioning, Asynchronous Processing, Compression, Replication
- Stored Procedures, Vertical Scaling, Horizontal Scaling, Normalization
Strategies such as caching, database indexing, query optimization, and load balancing can be effective in optimizing an application that frequently queries a large database.
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.
How is an asynchronous task started in a servlet?
- asyncTask.start()
- beginAsync()
- initAsync()
- startAsync()
An asynchronous task in a servlet is started using the startAsync() method. This method initiates asynchronous processing and returns an AsyncContext for managing the asynchronous task.
How is a servlet configured in a web application?
The tag is used to define a servlet in the web.xml file. The element specifies the fully qualified name of the servlet class, providing the configuration necessary for the servlet container to manage the servlet.