By querying a feed from Bigtable, we are really just using Bigtable as another caching layer.

通过查询Bigtable中的提要，实际上使用了Bigtable作为另一个缓存层。

youdao

Directly using SQL makes caching problematic, since the caching layer must deal with full result sets rather than single database rows.

直接使用SQL会使缓存出问题，因为缓存层必须处理完整的结果集，而不是单独一个数据库行。

youdao

It's a distributed memory caching system which Facebook (and a ton of other sites) use as a caching layer between the web servers and MySQL servers (since database access is relatively slow).

它是一个分布式的内存缓存系统，Facebook(包含其他很多网站)用它作为Web服务器和MySQL服务器之间的缓存层(因为数据库访问相对比较慢)。

youdao