top nosql databases

original data set to improve query efficiency. Shortcomings are also more obvious, updating the reviewer data will be more troublesome.(4) Data coupling?: SQL does not allow the deletion of external data that has already been used, such as "Bear three" in the reviewer table has been assigned to the borrower bear big, then in the reviewer table will not be allowed to delete the bear three this data to ensure data integrity, and NoSQL there is no such

I. MongoDB Introduction MongoDB (named from "humongous") is a scalable, high-performance, open-source, free-mode, document-oriented database, it combines the advantages of document databases, key-value pairs, and relational databases. Official site: http://www.mongodb.org/,mongodbhighlights: • Document-oriented storage (simple and powerful JSON-like data mode)• Dynamic query• Full index support, extended to

can also be detected based on patterns between relationships (fraud in transaction).non-applicable occasionsThe graph database may not be applicable in some cases. This is the case when updating an entity in all or a subset. For example, in a "Data analysis solution" (analytics solution), all entities have to be updated as soon as one attribute is changed. The effect of the graph database is not ideal, because the simple operation can change a property in all nodes at once. Even if the data mod

-dimensional table databases:1. Analysis of data is of that type2. Store the main table data and get the return ID3. Branch, plus the primary table ID in different cases to the lava or Creeper table to store data4. Open loop, insert multiple records into the Inveneory tableThis is just a brief, but also consider the multiple table operations when the data rollback problem, actually write about 30 lines, then the error may be greatly improved.For

Facebook, Amazon, and Twitter. They need to distribute data to many servers. Traditional relational databases do not meet this scalability requirement. They need a single database node to execute all the operations of the same transaction.Therefore, a batch of distributed, NoSQL key-value pairs were developed to meet the scalability requirements of these large-scale applications. Such data storage includes

[ArticleAuthor: Sun Li link: http://www.cnblogs.com/sunli/ updated by: 2011-2-21] The previous two articles, "Why use nosql" and "relational database or nosql Database", roughly introduced why nosql should be used and when nosql should be used. I often feel confused when I see the introduction of

The previous "Why Use NoSQL" and "relational database or NoSQL database" two articles generally explain why NoSQL is used, and when to use NoSQL. Often have friends encounter confusion, see the introduction of NoSQL, feel very good, but do not know how to formally use their

NoSQL data model (4) Summary of nosql aggregation, NoSQLBackground in the first three articles, we have introduced three databases that belong to the aggregation model in NoSQL: Key-value type, document type, and column family type. The following analyzes the common points and differences of the three aggregate data mo

Label:The NoSQL column has been applied for almost a year, and has not filled an article, see today, or write an article put it in. Now the number of people who apply NoSQL is also very many, we may no longer be unfamiliar, the Chinese information has been flying all over the sky. But there are few answers to the questions about NoSQL. It may be that everyone is

Do you really understand the nosql world ?, Nosql world Recently, I want to sort out my nosql knowledge and some nosql databases. One is to deepen your understanding of nosql, and the other is to organize your knowled

The reason for writing this article is that mysql5.6.2 suddenly launched the memcached function. The emergence of nosql to InnoDB with memcached shows that nosql has indeed had a huge impact on relational databases. I personally think this is a huge improvement, allows developers to use nosql and relational

The reason for writing this article is that MySQL5.6.2 suddenly launched the memcached function. The emergence of NoSQL to InnoDB with Memcached shows that NoSQL has indeed had a huge impact on relational databases. I personally think this is a huge improvement, allows developers to use NoSQL and relational

Tags: relational data table NoSQL database L database Combat div operation Field Why NoSQL is produced: The fact that relational databases are not good at doing so is the reason why NoSQL is Born: Large number of data write operationsThe book is written "large amounts of data write operations", I unde

Differences between NoSQL and SQL: NoSQL and SQL. About the difference between NoSQL and SQL, NoSQL and SQL simply put: SQL is a structured query language for relational databases, while nosql generally refers to relational

Middleware (3) NoSQL and middleware nosql The most common interpretation of NoSQL is non-relational or not only SQL. It can be seen from the field meaning that it refers to a general term of non-relational databases.Background of the emergence of NoSQL With the development of the distributed architecture of large websi

In-depth analysis of NoSQL database distributed algorithms (graphic details), nosql text Although the NoSQL movement has not brought about fundamental technological changes to distributed data processing, it still triggers overwhelming research and practices on various protocols and algorithms. In this article, I will systematically describe the distributed featu

Tags: and EXT structure Publishing NAT process name Data Model operationsThe SQL (Structured Query Language) database is the primary way to store data over the past 40 years. The late 1990s with the rise of Web applications and open-source databases such as MySQL, PostgreSQL, and SQLite, the explosion of user growth. NoSQL databases have been in existence since t

MongoDB-NoSQL, nosql Comparison between mongoDB and SQL: The biggest difference from a common database is structured and unstructured. NoSQL: Generally, it refers to non-relational databases. Compared with relational databases, in fact, its previous evolution is a data organ

relational databases Follow acid rulesTransactions are transaction in English, similar to real-world transactions, and have the following four features:1, A (atomicity) atomicityAtomicity is easy to understand, that is, all operations in a transaction are either done or not, and the transaction succeeds because all operations in the transaction are successful, and as long as one operation fails, the entire transaction fails and needs to be rolled back

I. Create a new database usetoto; switchedtodbtotoshowdbs; admin (empty) local0.078GBusetoto; alias creates 1 million pieces of data for (vari1; i000000; I ++ ){... db. c3.insert ({name: zhangsan, age: I });...} db. I. Create a new database use toto;