...如何启用RCSI： 对于你SELECT查询，如果你想有重复读（Repeatable Reads）的乐观方式，你可以使用快照隔离（Snapshot Isolation (SI)）隔离级别。快照隔离提供你开箱即用（out of box）的重复读，这就是说你总拿到在你事务开始前有效的行版本。
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Percolator通过“ 快照隔离”实现了遵从ACID的跨行及跨表事务，从而满足多线程在多台服务器上对文档库进行转换操作的需求。
Percolator was designed to provide cross-row, cross-table ACID-compliant transactions via " snapshot isolation" since many threads on many machines need to transform the repository.
所有测试都应该与生产环境隔离，最好使用一个生产数据快照，以便您能够更好地测试新环境。
All testing should happen in isolation from the production environment, preferably with a snapshot of production data so you can better exercise the new environment.
SQL 2005有一个 基于快照的隔离级别 ，它能在不允许“脏读”的情况下避免数据读取阻塞数据写入，或者数据写入阻塞数据读取。
SQL 2005 has snapshot-based isolation levels that prevent readers from blocking writers or writers from blocking readers without allowing dirty reads.
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