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optimistic concurrency

Letting people edit freely, then refusing a save if someone else changed the row first.

Optimistic concurrency checks a concurrency token (such as a version column) in the UPDATE's WHERE clause; zero affected rows raises DbUpdateConcurrencyException.

Examples

  • Two clerks edit order 42; the second SaveChanges throws DbUpdateConcurrencyException instead of overwriting the first.

See also

transaction race condition
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