what is best nosql database

NoSQL database changes the disadvantage of relational database, easier integration, distributed, no mode, failure recovery and other characteristics, is a step by step meal relationship Database market, as a time-keeping with the code of the farmers to understand the new tec

With the development of Internet technology, the requirement of data storage is high, there is high demand in capacity, security, backup, high availability and so on, the popular relational database has SQL Server, MySQL, Orcale, etc., non-relational database has key, value type Redis , Memcached, the document

Problems encountered in traditional mysql+ memcached architecturesThe actual MySQL is suitable for massive data storage, through the memcached to load hot data to the cache, speed up access, many companies have used such a structure, but with the increasing volume of business data, and the continuous growth of traffic, we encounter a lot of problems:1.MySQL needs to be continuously disassembled, memcached also need to continuously follow the expansion

, distributed does not support multi-Library form -----------------Snapshot------------------------------------------- Save seconds Changes Save 900 1 900 seconds 1 records send changes, record snapshot Save " Save" 10000 Save "to prohibit the persistence feature, only cache, you need to comment the above three lines br>----------------Master-slave-------------------------------- slaveof masterip masterport salveof Primary IP primary port, If starting this

NoSQL Database: consistent data reading strong consistency access to any node in the cluster at any time, and the data results are consistent. consistent user consistency is consistent with the data obtained during cluster access for the same user; solve user consistency: Use a sticky session to bind the session to a specific node for processing; this will reduce

satisfy a+b=10, otherwise the transaction fails. 3, I (isolation) Independence The so-called independence refers to the concurrent transactions do not affect each other, if one transaction to access the data is being modified by another transaction, as long as another transaction is not committed, the data it accesses is not affected by uncommitted trans

Software architects who have worked for a number of large companies have taken into account the Kristóf Kovács's NoSQL database of mainstream blogs (Cassandra, Mongodb, CouchDB, Redis, Riak, Membase, Neo4j and HBase) made a comprehensive comparison. Although the SQL database is a very useful tool, the monopoly

A distributed model of a NoSQL database single serverWhen a server is fully competent to work, there is no need to consider the distribution, so the deployment is simple, maintenance is much more convenient;Shard FeaturesThe vario

Python memory NoSQL Database #!/usr/bin/python#-*- coding: UTF-8 -*-## memdb.py# python memory db## 2015-12######################################################################### The MIT License (MIT)# http://opensource.org/licenses/MIT## Copyright (c) 2015 copyright cheungmine## Permission is hereby granted, free of charge, to any person obtaining# a co

.# respectively in the browser address bar, input 127.0.0.1:28017 and 127.0.0.1:27017 can see Mongo.exe is the MongoDB interactive shell (4) It is inconvenient to start the service so that the MongoDB service can be set as Windows system service D:\mongodb\bin>mongod--logpath d:/mongodb/logs/mongodb.log--logappend--dbpath D:/mongodb/data--directoryperdb --servicename MongoDB--install This allows the Mong

January 18, 2012, Amazon released Amazondynamodb, a fully managed, high-performance, high-reliability, cost-effective NoSQL database. Dynamodb is ideal for Internet-scale applications.The DYNAMODB database incorporates Amazon's many years of experience in large, non-relational databases and cloud computing. As early as

". GetBytes (CharSet), "value-04". GetBytes (CharSet)); Writebatch.delete ("key-01". GetBytes (CharSet)); Db.write (Writebatch); Writebatch.close (); Read Byte[] bv = Db.get ("key-02". GetBytes (CharSet)); if (BV! = null bv.length > 0) {String value = new String (bv,charset); System.out.println (value); }//iterator, traversal, sequential read//Read the current Snapshot, snapshot, read the data during the change, will not be reflected