redis nosql

I. Redis configuration file 1. General configurationDaemonize No # By default, Redis is not run in daemon form. Daemonize Configuration Items Control the way Redis operatesPidfile/path/to/redis.pid #当以daemon形式运行时, Redis generates a PID file that is generated by default in/var/run/redis.pidBind 192.168.1.2 10.8.4.2 # Sp

Label:One, Redis data common operation 1, string common operationSet Key1 Aminglinux Get Key1 Set Key1 aming//A key corresponds to a value, multiple assignments, overwriting the previous value SETNX Key2 AAA//return 1 Get Key2 setnx key2 BBB//Return 0 Description: Setnx If key exists, returns 0, does not exist will create this key directly Setex Key3 10 1//This is used to set the expiration time for key Mset Key1 1 Key2 2 Key3 3//Set multiple keys sim

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,

In general, data persistence stores data on disks to ensure that data is not lost due to factors such as power outages. Redis often needs to synchronize data in the memory to the disk to ensure persistence. Redis supports two persistence Methods: Snapshotting (snapshot) and Append-onlyfile (aof ). In general, data persistence stores data on disks to ensure that data is not lost due to factors such as power

I. Learning NoSQL1. Case and CommentImport RedisR = Redis. Redis (host= "192.168.48.136", port=6379, Db=0)Print (R)Print (R.keys ())Print (R.get ("AAA"). Decode ("Utf-8"))# string manipulation# Get (Key)# Set (key, value)# mget (K1, K2, K3, K4)# Mset (K1=V1, K2=v2)# operation of the list# Add Lpush (name, value) to the left# Add Rpush (name, value) to the right# Insert Linsert (name, where, Refvalue, value)

these operations, we can implement the friend recommendation and blog tag FUNCTIONS In sns. Ii. Related operation commands1: saddDescription: adds a member to the set sequence.Return Value: the number of actually inserted members in this operation.Command Format: sadd key member [member...]Time Complexity: O (N) N: Number of table operation membersThe procedure is as follows: Redis 127.0.0.1: 6379> sadd my_set test1(Integer) 1Redis 127.0.0.1: 6379> s

I used redis as the cache system on the website and used its pecl client (this is github. comnicolasffphpredis ). There is no problem in use, but I found a problem when I looked at the number of links recently, that is, the number of backend links is very high. net... I used redis as a cache system on my website and used its pecl client (that's the https://github.com/nicolasff/phpredis ). There is no proble

First, Redis's replication:The following list clearly explains the features and benefits of Redis replication.1). The same master can synchronize multiple slaves.2). Slave can also accept other slaves connection and synchronization requests, which can effectively load the sync pressure of master. So we can treat Redis's replication architecture as a graph structure.3). Master Server provides services for slaves in a non-blocking manner. So during Mast

tracing, APIs used to program stack unrolling, and APIs that support the C ++ exception handling mechanism. 2. Install google-perftools: Install apsaradb for redis Check whether tcmalloc is effective # Lsof-n | grep tcmalloc The following information takes effect: Redis-ser 13768 root mem REG 1616491 788696/usr/local/lib/libtcmalloc. so.0.1.0 Modify the configuration file: Vim

Tags: customers ast conversions stringstr Reverse order nosql database flush variable type 1, set a 1 assignment is converted to a character type by default (type a can query the variable type) 2, get a query A's value 3, Rpush list_a a b c defines a list containing a,b,c three variables list_a 4, Lpus H List_a A inserts element a 5, lrange list_a 0 9 to the left of the list list_a the first 10 elements of List_a 6, Lrange list_a 0-1 shows al

Redis Common data typesThe most commonly used data types of Redis are the following five kinds:StringHashListSetSorted SetBefore describing these types of data, let's look at a diagram of how these different data types are described in Redis internal memory management:　　First, Redis internally uses a Redisobject object

Tags: nosqlI. The introduction of NoSQLNon-relational database (MySQL, Oracle, SQL Server are relational databases)1. Features No relationship between data, arbitrary expansion Data storage is simple, can exist in memory, read and write fast You do not need to build tables, fields. Custom formats 2. ClassificationA. Key value (key-value) database :redis, memcached, RiakRedis/memcached is suitable for storing user information, suc

minus the specified value append appends a string to the specified key to return the length of the new string value strlen takes the length of the value of the specified key N Bsp Hashes type Redi->hash is a string-type field and value mapping table, and his addition, delete operations are all 0 (1). Hash is suitable for storing objects, which is equivalent to dividing each field of an object into the brother string type, storing a degree downstream in a hash type with less memory, and p

Tags: Redis master commandsRedis is also a key-value storage system, the official site Http://redis.io, but with respect to memcache, there are the following advantages:1. Support More value types (string, hash, lists, sets, sorted sets, etc.);2, support data persistence, prevention service restart need to re-storage;Redis has two file formats: full-volume data (Rdb=red