How to make PHP and MySQL run faster by setting up caching

PHP and MySQL are currently one of the most commonly used technologies in website and application development. However, during the operation of the application, performance bottlenecks are often encountered. In order to solve these problems, we need to take various measures to improve the performance of the application. One of the simple and effective ways is to improve the running speed of PHP and MySQL by setting up cache.

1. What is caching

Cache is a technology that pre-loads data, which stores data in memory so that the next time you access that data, it can be accessed faster Loading. For example, if a website needs to perform a query repeatedly, the query can be cached so that subsequent operations can access the data more quickly.

2. How to set up PHP cache

The most common method of PHP caching technology is to use an Opcode cache, such as APC or Opcode Cache. These caches can cache compiled bytecode when the PHP interpreter executes the script, thereby speeding up the running speed of the script. To use Opcode Cache, follow these steps:

• Install Opcode Cache - Installing and configuring Opcode Cache is very simple and in most cases can be accomplished in just a few simple steps .
• Enable Opcode Cache - Enable the cache in the php.ini file.

• Verification function - Check whether the cache has been successfully installed and enabled by adding the phpinfo(); statement to the script. You can also use benchmark testing tools to test performance differences.

  3. How to set up MySQL cache

MySQL also provides built-in caching capabilities to reduce MySQL server load and increase data access speed. MySQL's cache is divided into two types: query cache and InnoDB cache. Query cache can cache executed queries, while InnoDB cache can cache table data and index data.

MySQL query cache is used here. To use query cache, follow these steps:

• Enable query cache – Set query_cache_type = 1 in the MySQL configuration file to enable query cache.
• Configure query cache size – You can set the cache size using query_cache_size. It is recommended to set this to 16M to ensure the cache can handle most queries.

• Verify settings – You can use the command SHOW VARIABLES LIKE 'have_query_cache' to verify that the query cache is enabled. Additionally, you can run query commands using the EXPLAIN SELECT statement to verify that the cache is being used.

  4. Other optimization methods

In addition to setting up cache, there are other optimization methods that can improve the running speed of PHP and MySQL. Here are some simple optimization tips:

• Write high-performance PHP code – Some of the most common PHP performance problems include using too many loops and allocating too much memory to variables. Reducing these issues by writing more efficient PHP code can improve application performance.
• Optimize MySQL queries – Avoiding SELECT * statements and slow queries can reduce the load on the MySQL server and speed up data access.

• Modify the server environment – ​​Modifying the server kernel and hardware environment, such as increasing memory and using a faster hard drive, can improve server performance.

  5. Summary

Caching is one of the effective ways to improve the performance of PHP and MySQL applications. Applications can be accelerated by using Opcode Cache and MySQL Query Cache. Apart from this, there are other optimization techniques that can be used, such as writing high-performance PHP code and optimizing MySQL queries. Using these methods can greatly improve the performance of your applications, making them run faster and more efficiently.

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