问题
I have a database that won't grow much in size. It's current size is about 1 GB.
Achieving the fastest performance is desired.
Question: When should I use Memcache vs simply using MySQL Innodb ability to store all my content within RAM (innodb_buffer_pool_size)?
回答1:
I would only resort to memcached if you require more than one server to hold everything in RAM. Otherwise, you're adding complexity for not much functionality.
回答2:
mysql is more performance degradated on much threads then memcached. so when you will get much simultaneous requests - memcached will respond almost in the same constant time, but mysql's time will be worse.
anyway - until you get about 3-5k tps (or more) to write - there is no any reasons to make project infrastructure more complex.
来源：https://stackoverflow.com/questions/2444011/memcache-vs-mysql-in-memory