NoSQL 与 NoSQL 之间的区别,要远大于不同的 SQL 数据库之间的区别,所以软件架构师必须要在项目一开始就选好一款合适的 NoSQL。
即使关系型数据库依然是非常有用的工具,但它们持续几十年的垄断地位就要走到头了。现在已经存在无数能撼动关系型数据库地位的 NoSQL,当然,这些 NoSQL 还无法完全取代它们。(也就是说,关系型数据库还是处理关系型事务的最佳方式。)
NoSQL 与 NoSQL 之间的区别,要远大于不同的 SQL 数据库之间的区别,所以软件架构师必须要在项目一开始就选好一款合适的 NoSQL。
考虑到这种情况,,本文为大家介绍以下几种 NoSQL 之间的区别:Cassandra, Mongodb, CouchDB, Redis, Riak, Couchbase (ex-Membase), Hypertable, ElasticSearch, Accumulo, VoltDB, Kyoto Tycoon, Scalaris, Neo4j和HBase:
最流行的 NoSQL MongoDB 2.2版开发语言: C++
主要特性: 保留 SQL 中一些用户友好的特性(查询、索引等)
许可证: AGPL (驱动: 采用Apache许可协议)
数据传输格式: 自定义,二进制( BSON 文档格式)
应用场景:
使用案例:
想布署 MySQL 或 PostgreSQL,但预先定义数据字典让你望而却步。这个时候,MongoDB 是你可以考虑的选项
MongoDB 的详细介绍:请点这里
MongoDB 的下载地址:请点这里
推荐阅读:
CentOS 6 使用 yum 安装MongoDB及服务器端配置
Ubuntu 13.04下安装MongoDB2.4.3
如何在MongoDB中建立新数据库和集合
MongoDB入门必读(概念与实战并重)
《MongoDB 权威指南》(MongoDB: The Definitive Guide)英文文字版[PDF]
Riak 1.2版开发语言: Erlang、C、以及一些 JavaScript
主要特性: 容错机制(当一份数据失效,服务会自动切换到备份数据,保证服务一直在线 —— 译者注)
许可证: Apache
数据传输格式: HTTP/REST 架构,或自定义二进制格式
应用场景:
使用案例:
销售点数据收集;工厂控制系统;必须实时在线的系统;需要易于升级的网站服务器
CouchDB 1.2版开发语言: Erlang
主要特性: 数据一致性;易于使用
许可证: Apache
数据传输格式: HTTP/REST
应用场景:
使用案例:
可用于客户关系管理(CRM),内容管理系统(CMS);可用于主主互备甚至多机互备
更多详情见请继续阅读下一页的精彩内容:

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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