Discussion on how Memcached cache optimizes PHP applications

Memcached is an open source, easy-to-deploy and lightweight distributed caching system that is widely used in caching of web applications. It can be used to resolve database access bottlenecks often used in larger web applications, while also improving application performance. In this article, we will discuss how to use Memcached to optimize caching for PHP applications.

1. Use cache

Using cache can effectively reduce the number of database queries in web applications. Because if a query result already exists in the cache, then we do not need to query the database again. This can effectively reduce the system response time and improve system performance.

2. Reduce the amount of query data as much as possible

When we use caching, we need to reduce the amount of query data as much as possible. This is because network transmission itself is a very slow process. If the amount of data we query is too large, it may cause network delay problems, which will have a great impact on the performance of the system.

3. Using Memcached API

Memcached provides a series of APIs that can be used to read and write cache. When we use PHP and Memcached together, we'd better use PHP extension to apply Memcached API.

4. Use the Memcached namespace as much as possible

Using the Memcached namespace can effectively reduce cache collision problems and ensure that different cached data do not interfere with each other. For example, we can use different namespaces for different pages to avoid conflicts with cached data.

5. Set an appropriate expiration time

Setting an appropriate expiration time can avoid performance problems caused by the expiration of cached data. For example, we can set a shorter expiration time for dynamic data and a longer expiration time for static data.

6. Keep the cache consistent

Consistency is very critical, which means that the cache data and the back-end database and other cache data must be kept in sync. Otherwise, errors and inconsistencies in application functionality can result.

7. Compress as much as possible

Compression can effectively reduce the amount of data transmitted. For example, using compression can compress 1000 bytes of data into 200 bytes of data, and can also avoid some network problems during transmission.

Overall, using Memcached can effectively improve the performance of web applications and reduce the response time of the system. When using Memcached, we need to reduce the amount of database queries as much as possible and set an appropriate expiration time to maintain cache consistency. At the same time, we also need to use the Memcached API and utilize namespaces to effectively manage cached data.

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