What does "EF" stand for in the context of ADO.NET?
- Entity Facade
- Entity Factory
- Entity Flow
- Entity Framework
Entity Framework (EF) stands for Entity Framework. It is an Object-Relational Mapping (ORM) tool provided by ADO.NET, facilitating developers to work with relational data as domain-specific objects, eliminating the need for most of the data access plumbing code.
In ADO.NET Entity Framework, the [Key] attribute is often used to specify the ___________ property of an entity.
- Foreign
- Identity
- Navigation
- Primary
The [Key] attribute in Entity Framework is commonly applied to specify the identity property of an entity, indicating the property that uniquely identifies each instance of the entity.
When multiple users are modifying the same data concurrently, ___________ can help ensure data integrity.
- Constraints
- Isolation
- Locking
- Transactions
In scenarios where multiple users are modifying the same data concurrently, concurrency control mechanisms such as locking can help ensure data integrity by preventing conflicting modifications from occurring simultaneously.
Scenario: Your ADO.NET application is experiencing performance issues, and you suspect that connection pooling might be the cause. How can you investigate and optimize the connection pool settings?
- Adjust the "Min Pool Size" setting in the connection string
- Check the "Max Pool Size" setting in the connection string
- Evaluate the "Connection Lifetime" setting in the connection string
- Monitor the number of connections in use and the connection wait time
Monitoring the number of connections in use and the connection wait time is essential to understand the current utilization of the connection pool and identify any potential bottlenecks. By adjusting the pool size settings, such as "Max Pool Size" and "Min Pool Size," and evaluating parameters like "Connection Lifetime," you can optimize the connection pool for better performance.
Scenario: You want to find all the products that are in stock and have a price greater than $50. Which LINQ operators would you combine to achieve this in a single query?
- Where and Select
- Where and OrderBy
- Where and GroupBy
- Where and Any
The correct option is Where and Select. You would use the Where operator to filter the products that are in stock and have a price greater than $50, and then use the Select operator to project the results into a new collection containing only the required product information. This combination allows you to filter and select the desired products in a single query.
To optimize LINQ queries for performance, you can use the ___________ method to reduce the number of database calls.
- Aggregate
- AsQueryable
- Join
- Select
To optimize LINQ queries for performance, you can use the AsQueryable method to reduce the number of database calls. This method converts an IEnumerable collection to an IQueryable collection, allowing the query to be executed on the database server instead of in-memory. This can lead to significant performance improvements, especially when dealing with large datasets or complex queries.
To improve LINQ query performance, you can use the DataLoadOptions class to specify ___________ loading.
- Eager
- Lazy
- Deferred
- Immediate
Eager loading retrieves all related data at once, which can enhance performance by reducing the number of database calls. This is done using the LoadWith method of DataLoadOptions.
When executing an INSERT command, you can use ___________ to specify the values to be inserted.
- INTO clause
- SELECT clause
- VALUES clause
- WHERE clause
In an INSERT command in SQL, the VALUES clause is used to specify the values to be inserted into the specified columns of a table. It allows you to define the data that will be added to the table.
DataGrid and DataGridView controls are often used for displaying data in a ___________ format.
- Graphical
- Hierarchical
- Tabular
- Textual
DataGrid and DataGridView controls are often used for displaying data in a Tabular format. These controls provide a grid-like structure that allows data to be displayed in rows and columns, making it suitable for presenting tabular data retrieved from databases.
Scenario: Your application uses Entity Framework extensively, and you notice that some queries are slow. What steps can you take to identify and address performance bottlenecks in Entity Framework?
- Analyzing generated SQL queries for inefficiencies
- Ensuring proper indexing on database tables
- Implementing caching mechanisms to reduce database hits
- Using database profiling tools to identify slow queries
Analyzing generated SQL queries helps identify any inefficient queries that might be causing performance issues. Database profiling tools provide insights into query execution times and help pinpoint slow queries. Ensuring proper indexing on database tables can significantly improve query performance. Implementing caching mechanisms reduces the need for frequent database hits, enhancing overall performance.