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:

Redis and memcached comparisonThe two years of Redis fire, Redis is often used as a memcached challenger to be mentioned on the desktop. The comparison between Redis and memcached is ubiquitous. However, does Redis really go beyond memcached in

The recent project needs to use the Redis cache and clustering technology, so in the spare time to study a piece of work, in fact, on-line Redis installation configuration of the article there are many, but the total feeling is not very complete,

Principle: PHP Default extension library does not contain Redis extensions; To support Redis extensions, you need to have redis.so this extension fileSo our goal is to generate the redis.so extension file and modify the php.ini to support the Redis

After the 1.redis installation is complete (I am redis-3.0.7), modify the configuration file redis.conf, modify the following itemsNote: The following actions are performed under the root userGedit redis.conf Open File for modificationA) Daemonize

Https://github-cloud.s3.amazonaws.com/releases/3402186/25358446-c083-11e5-89cb-61582694855e.zip? X-amz-algorithm=aws4-hmac-sha256&x-amz-credential=akiaistnzfovbijmk3tq%2f20160321%2fus-east-1%2fs3%2faws4_

Redis is a high-performance Key-value database that uses memory as primary storage, data access is very fast, and of course it provides two mechanisms to support data persistence storage. Unfortunately, Redis projects do not directly support windows,

Tool download location: HTTP://PAN.BAIDU.COM/S/1HQVH1F2, including server-side configuration and tools to view the cache.The server runs as a service, extracts the Redis server to a directory, and executes the cmd

About RedisRedis is a key-value storage System , the official site Http://redis.io1. similar to memcached, but supports data persistence2. support for more value types , in addition to string (string), also support hash, lists (linked list), sets

Redis PersistenceRedis provides two ways to persist, namely, RDB (redis DataBase) and aof (Append only File).An RDB, in short, generates snapshots of redis-stored data at different points in time and stores it on media such as disks .AOF, it is to

Redis master-slave replication principle:By passing this RDB file or aof file to the slave server, the slave server reloads the Rdb file to realize the function of replication!Copy the words: The master server can have multiple slave servers!!! Not

The goal of Redis is to be concise and efficient, because the transaction itself is a complex thing, and all we can't do is complicate the transaction ... multi，exec 127.0.0.1:6379> multi OK 127.0.0.1:6379> lpush fruits orange

Because you need to. Compare Redis data export to database data, and export data in a pipe-break connection:/opt/$company _name/redis-3.0.5/bin/redis-cli-h $IP-P $PORT-a $PASSWORD keys \* |xargs-n 1/opt/$company _name/redis -3.0.5/bin/redis-cli-h

The files for the memory management functions of the Redis database are: Zmalloc.h and ZMALLOC.C.Redis author in the memory management module to consider the view system is installed in the Tcmalloc or Jemalloc module, these two are already a long

Reference article: http://blog.sina.com.cn/s/blog_51df3eae01016peu.htmlWe know that Redis does not implement its own memory pool, and does not add its own stuff to the standard system memory allocator. Therefore, the performance and fragmentation

Redis InstallationI am using ubuntu15.1, open terminal, enter command: sudo apt-get install redis-server will be installed on the native Redis.Start RedisStart Redis command: Redis-serverPersonal boot Redis after the terminal display content is as

Hacking StringsThe implementation of Redis strings is contained in SDS.C (SDS-stands for simple Dynamic strings).The C structure SDSHDR declared in sds.h represents a Redis string:struct SDSHDR { long len; Long free; Char buf[];};The buf

Master Write memory snapshot, save command dispatch Rdbsave function, will block the work of the main thread, when the snapshot is large, the performance impact is very large, will intermittently pause service, so master should not write memory

1. Create 2 directories on a Windows disk, for example: Masterredis (the master service is stored) Slaveredis (slave service is stored)2. Configuration file (redis.conf) modification in Master service: Bind 127.0.0.1 (IP address of master)3.

Sentinel.conf## --------------------------------------Port 26379Dir/tmp# Sentinel Monitor # Master-name: cannot contain special characters, custom master name# Ip:redis Master IP# Redis-port:redis Master Port# Quorum: Objective down at least