哪些数据库支持同步复制（Java/嵌入式首选）？
我正在寻找一个支持同步复制和故障转移的数据库。自动故障转移是理想的选择，但手动故障转移也是可以接受的。我还更喜欢可以与 Java 应用程序捆绑在一起的东西。
H2 看起来可能会使用集群/高可用性模式。我的设置是低容量（<10 个并发用户，最少的数据）和 LAN（低延迟），但需要使用一致的数据进行快速故障转移。
我还应该查看其他数据库吗？我还应该探索其他类型的解决方案吗？我遇到过 DRBD、CouchDB、Terracotta 等，但它们对于我的需求（并且是为高容量工作负载而设计）来说似乎有点过分了。如果有人能为其中任何一个提出理由，我会再看看。
编辑：为了澄清，我想要一个可以嵌入的数据库以简化开发/测试，但会在客户端/服务器模式下运行它以促进故障转移。
I'm looking for a database that supports synchronous replication and fail over. Automatic fail over would be ideal, but manual fail over would be acceptable. I'd also prefer something I can bundle with a Java application.
H2 looks like it might work using the clustering / high availability mode. My setup would be low capacity ( < 10 simultaneous users, minimal data) and on a LAN (low latency), but a need for quick fail over with consistent data.
Are there any other databases I should look at? Are there any other types of solutions I should explore? I've come across things like DRBD, CouchDB, Terracotta, etc., but they seem like overkill for what I need (and designed for high capacity workloads). I'll have another look if someone can make a case for any of them though.
Edit: To clarify, I'd like a database that can be embedded to simplify development / testing, but would run it in client / server mode to facilitate fail over.
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Derby 有一些复制功能： http://db.apache.org/derby /docs/10.8/adminguide/cadminreplication.html
Derby has some replication functionality: http://db.apache.org/derby/docs/10.8/adminguide/cadminreplication.html