MemCache caching and Session (knowledge summary)

memcache is a distributed cache system developed by Brad Fitzpatrick of LiveJournal, but is currently used by many websites to improve website access speed, especially for some large databases that require frequent access. The effect of improving website access speed is very significant.

php Chinese website learning topic:php session(including pictures, texts, videos, cases)

The workflow of MemCache is as follows:

● First check whether the client's request data is in memcached. If so, return the request data directly without performing any operations on the database;

● If the requested data is not in memcached, check the database, return the data obtained from the database to the client, and cache a copy of the data into memcached (the memcached client is not responsible and needs to be explicitly implemented by the program);

● Each time the database is updated, the data in memcached is updated to ensure consistency;

It is a very good choice to use memcahe to handle cache and PHP sessions.

The following is a summary of the working principle, installation and PHP cache operation of memcahe.

1. "Introduction to MemCache"

memcached is a software developed by Brad Fitzpatric of Danga Interactive, a subsidiary of LiveJournal. It has now become an important factor in improving the scalability of Web applications in many services such as mixi, hatena, Facebook, Vox, LiveJournal, etc...

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2. "Installing memcache service"

memcache supports various operating systems such as windows and linux...

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3. "Enable php memcache extension"

php does not have the memcache extension enabled by default...

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4. "PHP Operation Memcache Cache"

After installing the memcache service and php extension, we can use php to operate memcache to implement caching. !

Summary of all methods of PHP's Memcache client...

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5. "Use memcache to save session"

By default, the session is saved in the form of a file on the server side. When we encounter large visits and high concurrency, we Web servers will be clustered. Then session sharing between different servers will become a problem...

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6. "Memcache Graphical Management Tool MemAdmin"

After saving the variables, we often want to see their values or detect their status. We can do this through the command line. However, the command line is difficult to understand. Let me introduce you to a memcache graphical management tool: MemAdmin...

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##7. "Memcache Security Related"

memcache itself does not have a permission control module, so the memcache service open to the external network can easily be scanned and discovered by attackers , sensitive information in memcache can be directly read through command interaction...

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