We are currently using postgresql for our production database in rails, great database, but I am building the new version of our application around SQLite. Indeed, we don't use advanced functions of postgres like full text search or PL/SQL. Considering SQLite, I love the idea to move the database playing with just one file, its simple integration in a server and in Rails, and the performance seems really good -> Benchmark
Our application's traffic is relatively high, we got something like 1 200 000 views/day. So, we make a lot of read from the database, but we make a few writes.
What do you think of that ? Feedback from anyone using or trying (like us) to use SQLite like a production database ?
If you do lots of reads and few writes then combine SQLite it with some sort of in-memory cache mechanism (memcache or redis are really good for this). This would help to minimize the number of accesses (reads) to the database. This approach helps on any many-reads-few-writes environment and it helps to not hit SQLite deficiencies - in your specific case.
SQLite is designed for embedded systems. It will work fine with a single user, but doesn't handle concurrent requests very well. 1.2M views per days probably means you'll get plenty of the latter.
For doing only reads I think in theory it can be faster than an out-of-process database server because you do not have to serialize data to memory or network streams, its all accessed in-process. In practice its possible an RDBMS could be faster; for example MySQL has pretty good query caching features and for certain queries that could be an improvement because all your rails process would use this same cache. With sqllite they would not share a cache.
来源：https://stackoverflow.com/questions/6097396/using-sqlite-as-production-database-bad-idea-but