A system storage consists of memcache+mysql, when writing a piece of data, there are several ways to update memcache,

A system store consists of Memcache+mysql, which writes a number According to the time, there are several ways to update memcache, what are the pros and cons?

Cache Updates (not just memceche) there are 2 different strategies

One is a write-up update one is a read-time update

one, write-time update refers to the write DB after the successful update of the cache ,

can effectively reduce penetration but easily cause inconsistent data.

Second, read the update is said to write out the db delete cache, Wait until you need to read it to rebuild the cache,

consistency can be guaranteed, but penetration is large, easy to stress the DB

A system storage consists of memcache+mysql, when writing a piece of data, there are several ways to update memcache,