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Purpose of Replication Replication 为数据提供冗余的同时，也提高了数据高可用性。由于在不同数据库服务器上拥有多个数据镜像，Replication可以有效防止单台机器故障导致的数据丢失。 Replication 还可以提高读性能。客户端将读请求与写请求发到不同服务器上。还可以在其他数据中心建立复制节点做异地灾备，进一步提高可用性。 Replicat... 阅读全文
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When deploying MongDB in production, you should have a strategy for capturing and restoring backups in the case of data loss events. There are several ways to back up MongoDB clusters. Backup by ... 阅读全文
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来源：http://doc.scrapy.org/en/latest/topics/architecture.htmlOverviewThe following diagram shows an overview of Scrapy architecture with its components ... 阅读全文
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Model Data for Atomic Operations Pattern In mongoDB, write operations, eg. db.collection.update(), db.collection.findAndModify(), db.collection.remove(), are atomic on the level of a single document... 阅读全文