「Document database:」采用 key-value 的概念,并经过更加复杂的设计;在这种类型的数据库中每一个文档都有它自己的数据,而且有一个唯一 ID 和数据对应。它是存储、检索和管理面向文档但仍是半结构化数据的绝佳选择。例如:MongoDB, CouchDB。 「Graph database:」互相关联的数据,最好是可以用图表示。这种存储方式...
图数据库与关系型数据库的比较 图数据库(Graph Database)是指以图表示、存储和查询数据的一类数据库。这里的“图”,与图片、图形、图表等没有关系,而是基于数学领域的“图论”概念,通常用来描述某些事物之间的某种特定关系。比如在我们的日常生活中: 社交网络是图。每个社交网络的参与者是节点,我们在社交网络中的交...
NoSQLis a non-relational database, meaning it allows different structures than a SQL database (not rows and columns) and more flexibility to use a format that best fits the data. The term “NoSQL” was not coined until the early 2000s. It doesn’t mean the systems don’t use SQL, ...
GraphDatabaseService graphDb = // a GraphDatabaseService instanceIndexService index = new LuceneIndexService( graphDb );//create a new node and index the "name" propertyNode neo = graphDb.createNode();neo.setProperty( "name", "Neo" );index.index( neo, "name", neo.getProperty( "name"...
Connect to the Database Engine What's new? Editions and features Release notes Business continuity Database design Hierarchical Data Collation Databases Event notification FILESTREAM, FileTable & BLOB Indexes SQL Graph Sequence numbers Service Broker ...
Graph databases.Graph data stores organize data as nodes, which are similar to rows in a relational database, and edges, which represent connections between nodes. Because the graph system stores the relationship between data or nodes, it can support richer representations of data relationships. Als...
Graph databases retain minimum sizing, even at a greater depth of data than other types of databases. The other types of databases fall somewhere in between those ranges.Key-Value vs. Graph: Data Model Differences The key-value model is great and highly performant for lookups of huge amounts...
Factors such as query patterns (transaction processing vs. analytics and reporting), storage subsystem behavior, available memory, and database engine improvements over time all play a role. Important Index maintenance decisions should be made after considering multiple factors in the specific context ...
NoSQL technologies have various data types: document, wide column, graph, and a key-value store. This makes this database more suitable to address multiple use cases. These databases need to be managed and operated in the production environment, and an operator is an excellent tool to automate...
Consult this SQL Server error code list (between 9000 and 9999) to find explanations for error messages for SQL Server database engine events.