Entity Framework Bulk Update Discover How to Improve Update Perfomance

Definition

UPDATE all entities in the database.

All rows that match the entity key are considered as existing and are UPDATED in the database.

// Easy to use
context.BulkUpdate(list);

// Easy to customize
context.BulkUpdate(customers, options => options.ColumnPrimaryKeyExpression = customer => customer.Code);

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Purpose

Updating entities using a custom key from file importation is a typical scenario.

Despite the ChangeTracker being outstanding to track what's modified, it lacks in term of scalability and flexibility.

SaveChanges requires one database round-trip for every entity to update. So if you need to update 10000 entities, then 10000 database round-trips will be performed which is INSANELY slow.

BulkUpdate in counterpart offers great customization and requires the minimum database round-trips possible.

Performance Comparisons

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