redis and memcached

Although many open-source tools use plug-ins or other methods to monitor the internal performance provided by these open-source components (the so-called internal performance is the data obtained by the STAT command class provided by these open-source components ), however, both deployment and expansion are troublesome. In fact, it takes 1-2 days to implement such a tool, and it is also very convenient to scale. For example, MongoDB: Another example is

Label:MongoDB is a document-based database where all data is read and written from disk. MongoDB is a good long query for modeless JSON data.And Redis is a memory-based key-value database, which is implemented by C language, similar to Nginx/nodejs working principle, the same way as a single-threaded asynchronous operation, read and write memory and asynchronous synchronization to disk, read and write speed than MongoDB has a huge increase. Therefore,

Much of the online introduction to the memcached and Redis differences is that Redis is more of a topic than the data types supported by memcached, and the performance ratio is very small, and I'm doing a performance test for both.The test content is as follows:Both add 50,000 key-value, and value is a string, the test

For example, we have recently conducted a design stress test. You can answer the question about how to disable a service, or describe how a service fails. For example, we have recently conducted a design stress test. You can answer the question about how to disable a service, or describe how a service fails. Reply content: For example, we have recently conducted a design stress test.You can answer the question about how to disable a service, or describe how a service fails. It is diffic

Picture storage with memcached or Redis

Memcached:lruReasons for high concurrency support: multiplexed IO (message notification mode), multithreaded mode (number of cores in CPU)Distributed scenarios:# normal hash distribution (modulo)# Consistent hash distribution (0-232 rings)RedisLRU: Remove one of the least recently accessed keys from the databaseRandom elimination algorithm: delete a key from the database randomlyTTL elimination algorithm: delete one of the fastest expired keys from the databaseObject counter: Reference to Counte

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Memcached Redis Persistence of Not supported Support Distributed Support Support Master-SlaveInvolves complex operations that may require a distributed lock to support Thread Multithreading Single thread avoids unnecessary context switching and race conditionsThread closure concept, the task of shutting down a thread, naturally

Redis:1, master-slave configuration (master-slave replication will not block the primary,)1) Bind 192.168.1.2 (please modify the IP address of the machine, otherwise the client cannot access it)2) slaveof 192.168.1.1 6379 (mapped to the primary server)3) You can disable data persistence in master, just comment out all the save configurations in the master configuration file and configure data persistence on slave onlyMemcached1,

For the company to build a test structure, requirements and really close to the environment need to install Nginx, PHP, MySQL, memcached, redis! But only to a R720 server, there is no way, can only run all on one stage Server model: Dell R710 Memory: 4G Operating system: CentOS 6.4 cpu:e5520 Individual Package Versions: Nginx-1.2.1 Php-5.4.14 Mysql-5.5.29 Memc