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articles/cosmos-db/sql/database-transactions-optimistic-concurrency.md

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@@ -52,7 +52,7 @@ Optimistic concurrency control allows you to prevent lost updates and deletes. C
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Every item stored in an Azure Cosmos container has a system defined `_etag` property. The value of the `_etag` is automatically generated and updated by the server every time the item is updated. `_etag` can be used with the client supplied `if-match` request header to allow the server to decide whether an item can be conditionally updated. The value of the `if-match` header matches the value of the `_etag` at the server, the item is then updated. If the value of the `if-match` request header is no longer current, the server rejects the operation with an "HTTP 412 Precondition failure" response message. The client then can re-fetch the item to acquire the current version of the item on the server or override the version of item in the server with its own `_etag` value for the item. In addition, `_etag` can be used with the `if-none-match` header to determine whether a refetch of a resource is needed.
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The item’s `_etag` value changes every time the item is updated. For replace item operations, `if-match` must be explicitly expressed as a part of the request options. For an example, see the sample code in [GitHub](https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos.Samples/Usage/ItemManagement/Program.cs#L676-L772). `_etag` values are implicitly checked for all written items touched by the stored procedure. If any conflict is detected, the stored procedure will roll back the transaction and throw an exception. With this method, either all or no writes within the stored procedure are applied atomically. This is a signal to the application to reapply updates and retry the original client request.
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The item’s `_etag` value changes every time the item is updated. For replace item operations, `if-match` must be explicitly expressed as a part of the request options. For an example, see the sample code in [GitHub](https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos.Samples/Usage/ItemManagement/Program.cs#L791-L887). `_etag` values are implicitly checked for all written items touched by the stored procedure. If any conflict is detected, the stored procedure will roll back the transaction and throw an exception. With this method, either all or no writes within the stored procedure are applied atomically. This is a signal to the application to reapply updates and retry the original client request.
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### Optimistic concurrency control and global distribution
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