Shulou(Shulou.com)06/01 Report--

Memcached usage background:

In most Web applications, data is saved to a relational database, where the WWW server reads the data and displays it in the browser. However, with the increase of the amount of data and the concentration of access, there will be some problems, such as the increase of the burden of relational data, the slow response of database, the delay of website opening and so on.

That's when Memcached came in handy. Memcached is a high-performance distributed memory caching service. The main purpose of using Memcached is to reduce the number of data access by caching the query results of the database in its own memory, so as to improve the speed of dynamic Web applications and improve the concurrency and scalability of the website architecture.

The working steps of the Memcached service are as follows:

1. The program first checks whether the data requested by the client exists in the Memcached service cache, and if so, it directly returns the requested data and no longer requests the back-end database.

two。 If the requested data does not exist in the Memcached cache, the program will go to the database service on the Memcached back end.

3. The data obtained from the database is returned to the client.

4. At the same time, put a copy of the data cache of the newly fetched database into the Memcached service cache, and the next time the same request will directly return the data from the Memcached service cache, thus reducing the pressure of database access.

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