问题描述
MongoDB 对我来说是一个很棒的数据库.但是，在某些情况下，我确实需要原子多文档事务.例如，在帐户之间转移东西(如金钱或声誉)，这需要完全成功或完全失败.
MongoDB is to me a great database. However there are cases where I really need atomic multi-document transactions. For example to transfer things (like money or reputation) between accounts and this needs to either succeed completely or fail completely.
我想知道是否可以通过实现多版本并发控制模式的库与 MongoDB 进行交互.
I wonder if it would be possible to interact with MongoDB through a library implementing the MultiVersion Concurrency Control pattern.
在表演方面会有多糟糕?使用混合方法是否可能且有利可图，仅在必要时使用mongo-mvcc"库，而在仅处理单个文档时使用传统的数据库连接，或者这会破坏 mvcc 的东西吗?
How bad would it be concerning performances?Would it be possible and profitable to use a hybrid approach, using the 'mongo-mvcc' library only when necessary and the traditional db connection when working only on a single document or would this break the mvcc stuff ?
推荐答案
最简单的方法是使用锁(两阶段提交)，虽然这在某些情况下效率不高.为了更高的并发性，可以在 Mongo 之上实现某种 MVCC.这篇文章提供了很好的描述:
The simplest way is to use locks (two-phase commit), although this is not very efficient in some cases. For higher concurrency some kind of MVCC can be implemented on the top of Mongo. This article provides a good description:
http://highlyscalable.wordpress.com/2012/01/07/mvcc-transactions-key-value/
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