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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