What is Entity Framework core interview questions?

What is Entity Framework core interview questions?

Top 20 Entity Framework Interview Questions & Answers

• What is ADO.NET Entity Framework?
• What other O/RMs you can use with .
• What is Micro O/RMs?
• What is Dapper?
• What is SQL injection attack?
• How to handle SQL injection attacks in Entity Framework?
• What are various approaches to domain modeling in Entity Framework?

How can enhance the performance of Entity Framework?

Tips to improve Entity Framework Performance

1. Avoid to put all the DB Objects into One Single Entity Model.
2. Disable change tracking for entity if not needed.
3. Use Pre-Generating Views to reduce response time for first request.
4. Avoid fetching all the fields if not required.
5. Choose appropriate Collection for data manipulation.

What are the types of development approaches in EF?

There are three approaches to model your entities in Entity Framework: Code First, Model First, and Database First. This article discusses all these three approaches and their pros and cons.

What are the SQL interview questions?

SQL Interview Questions

• What is Database?
• What is DBMS?
• What is RDBMS?
• What is SQL?
• What is the difference between SQL and MySQL?
• What are Tables and Fields?
• What are Constraints in SQL?
• What is a Primary Key?

What is migration in EF?

The migrations feature in EF Core provides a way to incrementally update the database schema to keep it in sync with the application’s data model while preserving existing data in the database.

What is lazy loading in Entity Framework?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

Why is EF so slow?

Answer. Entity Framework loads very slowly the first time because the first query EF compiles the model. If you are using EF 6.2, you can use a Model Cache which loads a prebuilt edmx when using code first; instead, EF generates it on startup.

How do I prepare for SQL interview?

Next steps: Preparing for your SQL interview

1. Retrieve Data using Single-Table SQL Queries.
2. Retrieve Data with Multiple-Table SQL Queries.
3. Querying Databases Using SQL SELECT statement.
4. Aggregate Data in SQL using MySQL Workbench.
5. Mastering SQL Joins.
6. SQL CASE Statements.

What is DbContext in Entity Framework?

A DbContext instance represents a combination of the Unit Of Work and Repository patterns such that it can be used to query from a database and group together changes that will then be written back to the store as a unit. DbContext is conceptually similar to ObjectContext.

What is the difference between IEnumerable and IQueryable?

The principle difference is that IEnumerable will enumerate all of its elements all the time, while IQueryable will enumerate elements, or even do other things, based on a query. The query is an Expression (a data representation of .

What is concurrency in Entity Framework?

Concurrency conflicts. A concurrency conflict occurs when one user displays an entity’s data in order to edit it, and then another user updates the same entity’s data before the first user’s change is written to the database.

Is Entity Framework faster than stored procedures?

Below is my console application followed by the result. I executed the same application at least 10 times and every time, the time taken by Entity Framework is almost 3-4 times more than the time taken by a stored procedure.

How delete a column in SQL?

Right-click the column you want to delete and choose Delete Column from the shortcut menu. If the column participates in a relationship (FOREIGN KEY or PRIMARY KEY), a message prompts you to confirm the deletion of the selected columns and their relationships. Choose Yes.

What are keys in SQL?

An SQL key is either a single column (or attribute) or a group of columns that can uniquely identify rows (or tuples) in a table. SQL keys ensure that there are no rows with duplicate information. Not only that, but they also help in establishing a relationship between multiple tables in the database.

Which is better LINQ or stored procedure?

Stored procedures are faster as compared to LINQ query they can take the full advantage of SQL features. when a stored procedure is being executed next time, the database used the cached execution plan to execute that stored procedure.

What is optimistic and pessimistic locking?

Optimistic locking , where a record is locked only when changes are committed to the database. Pessimistic locking , where a record is locked while it is edited.