couchdb vs cassandra

General classification of NoSQL database data models:1. Key-Value data model2. Document Data Model3. Column Family Data Model4. Figure Data ModelCommon NoSQL databases:Redis, Cassandra, MongoDB, neo4j, Riak ...Database application Trends:1. Due to the increasing volume of data, the scale-up of large systems is scaled by the scale-up of databases on a single computer in a computer cluster2. Hybrid persistence (relational database + NoSQL database)The f

. You might as well build a relational db cluster, but they're using shared storage, which is not the type we want. So there's a nosql era in which Google, Facebook, and Amazon are trying to handle more transmissions.NoSQL eraThere are a lot of NoSQL databases now, such as MongoDB, Redis, Riak, HBase, Cassandra, and so on. Each one has one of the following features: No longer use the SQL language, such as MongoDB,

Comparison and Analysis of eight common NoSQL Database Systems Krist óf kolács is a software architect and consultant who recently published an article comparing various NoSQL databases. Although SQL database is a very useful tool, after 15 years of outstanding performance, the monopoly will be broken. This is only a matter of time: I was forced to use relational databases, but I finally found that I could not meet my needs. However, the difference between NoSQL databases is far greater than tha

. MongoDBMongoDB is a document-oriented database that uses a JSON-style data format. It is ideal for Web site data storage, content management, and caching applications, and can be configured to enable replication and high availability features.MongoDB is highly scalable and performs well. It is written in C + + and is based on document storage. In addition, MongoDB supports full-text indexing, high availability across WANs and LANs, easy-to-implement replication, horizontal scaling, rich docume

15 very important Apache Open Source project SummarySince its inception in 1999, the Apache Software Foundation is now home to a number of important open source software projects. This article lists 15 very important Apache projects over the years, which are important not only for the open source movement, but also for the general world of technology.Although Apache does not maintain complete statistics on downloads, like Apache HTTP Server, which has become an engine for nearly 500 million site

database provides several different consistency models: Atom writes. If the database provides an API, a write operation can only be a single atomic assignment, and the way to avoid writing conflicts is to find the "latest version" of each data. This allows all nodes to obtain the same version at the end of the update, regardless of the order in which the updates are made, and network failures and delays often result in inconsistent sequence of update sequences for each node. The

. Write consistency. A write conflict often occurs in a partitioned database. The database should be able to handle this conflict and ensure that multiple write requests are not handled by different partitions. In this respect, the database provides several different consistency models: Atom writes. If the database provides an API, a write operation can only be a single atomic assignment, and the way to avoid writing conflicts is to find the "late

Label:Guide: Kristóf Kovács is a software architect and consultant who recently published an article comparing various types of NoSQL databases. Although SQL database is a very useful tool, the monopoly is about to be broken after 15 years of a single show. This is only a matter of time: forced to use relational databases, but eventually found to be unable to adapt to the needs of the numerous. But the difference between NoSQL databases is far more than two of the differences between SQL databas

Label:Guide: Kristóf Kovács is a software architect and consultant who recently published an article comparing various types of NoSQL databases. Although SQL database is a very useful tool, the monopoly is about to be broken after 15 years of a single show. This is only a matter of time: forced to use relational databases, but eventually found to be unable to adapt to the needs of the numerous. But the difference between NoSQL databases is far more than two of the differences between SQL databas

Label:Transferred from: http://blog.jobbole.com/1344/ Guide: Kristóf Kovács is a software architect and consultant who recently published an article comparing various types of NoSQL databases. Although SQL database is a very useful tool, the monopoly is about to be broken after 15 years of a single show. This is only a matter of time: forced to use relational databases, but eventually found to be unable to adapt to the needs of the numerous. But the difference between NoSQL databases is far more

query nosql storage 6th6.1 similarity between SQL and MongoDB query functions 1016.1.1 load movielens data 1036.1.2 mapreduce 108 in MongoDB6.2 access data in column-oriented databases such as hbase 1116.3 querying redis data storage 1136.4 conclusion 116Chapter 5 modifying data storage and management evolution 7th7.1 modify document database 1177.1.1 weak schema flexibility 1207.1.2 MongoDB data import and export 1217.2 evolution of data schema in column-oriented databases 1247.3 hbase data im

progress, and you will not be far from your junior ------ Solution -------------------- You can visit some recruiting companies... You will be able to know your possibilities in your own interview. ------ Solution -------------------- Can go to the Internet to watch write video while watching followed by trying to write code http://www.lampbrother.net/php/html/PHPvideo/ can go to this look above ------ Solution -------------------- When I go out for an interview, I will know what is missing. --

interview, you know what's missing. ------Solution-------------------- Let's try the interview ..... ------Solution-------------------- Grow in practice, the actual operation will find the problem, the impression is more profound. ------Solution-------------------- MySQL learns too many people, really want to learn to eat at the top of the pyramid. And the real big web doesn't have to be MySQL. Go straight to NoSQL. Cassandra (Cisco, WebEx, Digg, Fac

Since its inception in 1999, the Apache Software Foundation is now home to a number of important open source software projects. Among the successful projects are Geronimo, Tomcat, Hadoop and a distributed computing system that is now the key hub of the big Data kingdom.Although Apache does not maintain complete statistics on downloads, like Apache HTTP Server, which has become an engine for nearly 500 million sites worldwide, such as OpenOffice, it has been downloaded millions of times, although

very useful tool, after 15 years of outstanding performance, the monopoly will be broken. This is only a matter of time: I was forced to use relational databases, but I finally found that I could not meet my needs. However, the difference between NoSQL databases is far greater than that between SQL databases. This means that software architects should select a suitable NoSQL database at the beginning of the project. In this case, we compared Cassandra