sql and nosql database difference

Differences between NoSQL and SQL: NoSQL and SQL. About the difference between NoSQL and SQL, NoSQL and

database is better suited to the case where data is organized through relationships, and a dedicated text search system is better suited to situations where real-time search is required.Here, let's look at the main advantages and differentiation features of the SQL system:* SQL enables interactivity. SQL is a declarat

storage (disk space) is negligible. While non-relational data is stored in a flat dataset, data can often be duplicated. A single database is rarely separated, but stored as a whole, so that it is easier to read and write for the whole piece of data. Vertical Expansion vs Horizontal expansion The biggest difference between SQL and

characteristics of the data, NoSQL databases typically have unlimited (at least approximate) scalability 4) It is very efficient to get data by key, but the support for join or other structured queries is relatively poor based on their scope of application, the current mainstream architecture will adopt a combination of solutions, one can not be less.So far, there has not been a database that takes all kin

NoSQL databases are created to address the challenges of multiple data types for large data sets, especially for big data applications.In this paper, the definition, classification, characteristics of NoSQL database, and the current popular NoSQL database system are briefly

NoSQL databases are created to address the challenges of multiple data types for large data sets, especially for big data applications.In this paper, the definition, classification, characteristics of NoSQL database, and the current popular NoSQL database system are briefly

In a nutshell: SQL is a structured query language for relational databases, and NoSQL, the generic reference database, can not be used for SQL statements, although there are leisql query languages, and NoSQL databases do not have a unified query language. Related

transactions in the database (transaction) have ACID4 basic features that can be compared to trading:1,A (atomicity) atomicityEverything in the transaction is either completed or failed during execution and is rolled back.2,C (consistency) ConsistencyThe database should be in a consistent state.For example: Existing integrity constraints a+b=10, if a transaction changes A, then B must be changed3,I (isolati

data and safe . two. Non-relational database ( NOSQL):in order to deal with large amounts of data , the relationship between relational database needs to be removed. the initial design of non-relational database is to replace of the relational databaseRedisAdvantages :1, large amount of data deletion and modification

In the previous article, we discussed the main differences between SQL and NoSQL databases. Next, we'll use the knowledge in the previous article to determine how to determine the better choice in a particular scenario.First, let's summarize:SQL database: You need to define the underlying schema before using the table encourage

methods, so that looks more clear.) ） This data can be said to be a more complex database design situation, because it contains two cases (of course, more than two cases, it will produce more structure), different circumstances of the data table structure is different, which is very troublesome. Our general solution is to design four tables that take advantage of relational database relationships. The fol

, triggers 5. MongoDB first release : 2009 Licensing mechanism : Open source whether SQL: no The most popular NoSQL database, but retains some of the SQL attributes, such as high performance on query and index large datasets, which is good for dynamic queries and index definitions to support Linux, OS X, and Windows, b

Reprint Please specify source: Jiq's technical BlogHBase Features:Recently in learning HBase. HBase is indexed based on row health, and queries are fast and in real time.However, HBase is queried based on fields other than row health. Then it can only be a full-fledged scan, which is basically unacceptable.So HBase will generally be designed for detailed application scenarios, using the real-time nature of the query based on row health to achieve real-time query of hbase data.A relational

Reprint Please specify source: Jiq's technical BlogHBase Features:Recently in the learning Hbase,hbase based on the row Jian is indexed, the query speed will be very fast, completely real-time.But if HBase is to query based on fields other than row health, it can only be a full-fledged scan, which is basically unacceptable.So HBase will generally be designed for specific scenarios to design the health, the use of the real-time query based on row health to achieve real-time HBase data query.A rel

about the various points of view ... Point one: NoSQL will replace SQL This view is like saying that the ship will replace the car, because the ship is a new technology, it is impossible to happen. SQL and NoSQL have the same goal: to store data. They store data in different ways, which can affect the projects you dev

exciting than that. MySQL has provided such a function,Source codeHere. Here is a PPT demonstration of the o'reilly MySQL Conference. You can also read a blog of this function developer. Figure 3 NDB with memcached Although MySQL cluster has the advantages of high reliability and seamless expansion, it cannot be satisfied with the efficiency of complex SQL queries. However, MySQL cluster with memcached is a good choice for massive data stora

transaction changes A, then the B must be changed so that the transaction will still satisfy a+b=10, otherwise the transaction fails.3, I (isolation) IsolationThe 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 transactions.For example, there is a transaction from a to 100 yuan

such a function. Figure 3 NDB with Memcached Although MySQL Cluster has the advantages of high reliability and seamless expansion, it cannot be satisfied with the efficiency of complex SQL queries. However, MySQL Cluster with Memcached is a good choice for massive data storage requirements that rely solely on key-value queries and writes. Summary Because Memcached is simple, lightweight, and has a large number of clients, Memcached-compatible produc

The top 10 SQL and NoSQL databases in the latest statistics, and nosql databases in the latest statistics This ranking is based on the ranking of DB Engines, which analyzes the popularity of 200 different databases on the market. The Top 10 databases are listed here. Undisputed Top 3 Oracle, MySQL, and Microsoft SQL Se

instances that organize data based on relationships rather than traditional rows or documents, while a specific text search system is better at handling situations in which users can enter content in real time.Here, I intend to summarize the differences and major advantages of the SQL system compared to the simple key/value or even the JSON object storage system that is innovative in terms of storage format and extensibility.*