Entity Framework Update Records Discover How to Improve Performance
How to Bulk Update?
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.
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Answer
Entity Framework Extensions library adds the BulkUpdate extension method to the DbContext. BulkUpdate offers great customization and requires the minimum database round-trips as compared to SaveChanges.
// Easy to use context.BulkUpdate(list); // Easy to customize context.BulkUpdate(customers, options => options.ColumnPrimaryKeyExpression = customer => customer.Code);
All rows that match the entity key are considered as existing and are UPDATED in the database.
Performance Comparisons
| Operations | 1,000 Entities | 2,000 Entities | 5,000 Entities |
|---|---|---|---|
| SaveChange | 1,000 ms | 2,000 ms | 5,000 ms |
| BulkUpdate | 50 ms | 55 ms | 65 ms |
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