Eager Loading in EF Core

Eager Loading in EF Core:

Eager loading in EF Core is a technique where related data is loaded alongside the main entity in a single query using the .Include() method. This is useful when related data is needed immediately, avoiding multiple database round trips. You can also use .ThenInclude() for loading nested relationships.

While eager loading reduces the number of queries and ensures all required data is loaded in one go, it should be used judiciously to avoid performance pitfalls, especially with large datasets.

 

Best Practices:

  • Only eager load the relationships that are needed.
  • Use .AsNoTracking() for read-only data to improve performance.
  • Always profile queries to ensure optimal performance.

 

Advantages:

  • Fewer Queries: Reduces the number of database queries, improving performance.
  • Avoids N+1 Problem: Prevents additional queries when accessing related data in loops.

 

Disadvantages:

  • Large Data Sets: Over-fetching data can lead to performance issues with large result sets.
  • Complex Queries: Deeply nested .Include() statements can result in complex SQL queries.

 


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