nosql

问题 Have anyone ever used Delphi with NoSQL databases like Mongo, CouchDB or others? Which one would you recommend? 回答1: For Mongo, theres TMongoWire and pebongo (early stages). For couchDB, I believe one would interact mainly through HTTP/JSON For Cassandra, I believe the best bet would be to somehow incorporate a supported language inside your Delphi app and use that to interact with Cassandra, or else implement a web service in a supported language and make it accessible to your Delphi

问题 I have a general question about modeling in a graph database that I just can't seem to wrap my head around. How do you model this type of relationship: "Newton invented Calculus"? In a simple graph, you could model it like this: Newton (node) -> invented (relationship) -> Calculus (node) ...so you'd have a bunch of "invented" graph relationships as you added more people and inventions. The problem is, you start needing to add a bunch of properties to the relationship: invention_date

问题 I'm starting a project which I think will be particularly suited to MongoDB due to the speed and scalability it affords. The module I'm currently interested in is to do with real-time chat. If I was to do this in a traditional RDBMS I'd split it out into: Channel (A channel has many users) User (A user has one channel but many messages) Message (A message has a user) The the purpose of this use case, I'd like to assume that there will be typically 5 channels active at one time, each handling

问题 What would be suitable database for following? I am especially interested about your experiences with non-relational NoSQL systems. Are they any good for this kind of usage, which system you have used and would recommend, or should I go with normal relational database (DB2)? I need to gather audit trail/logging type information from bunch of sources to a centralized server where I could generate reports efficiently and examine what is happening in the system. Typically a audit/logging event

问题 I have a task to build a prototype for a massively scalable distributed shared memory (DSM) app. The prototype would only serve as a proof-of-concept, but I want to spend my time most effectively by picking the components which would be used in the real solution later on. The aim of this solution is to take data input from an external source, churn it and make the result available for a number of frontends. Those "frontends" would just take the data from the cache and serve it without extra

问题 I know this question is asked by many people already for my research, here's some questions asked before How to delete all relationships in neo4j graph? https://groups.google.com/forum/#!topic/neo4j/lgIaESPgUgE But after all, still can't solve our problems, we just want to delete "ALL" nodes and "ALL" relationships suppose delete "ALL" can see there are left 0 nodes 0 properties and 0 relationships This is the screenshot i took after executing the delete "ALL" suggested by forum My question

问题 I know this question is asked by many people already for my research, here's some questions asked before How to delete all relationships in neo4j graph? https://groups.google.com/forum/#!topic/neo4j/lgIaESPgUgE But after all, still can't solve our problems, we just want to delete "ALL" nodes and "ALL" relationships suppose delete "ALL" can see there are left 0 nodes 0 properties and 0 relationships This is the screenshot i took after executing the delete "ALL" suggested by forum My question

问题 What are the relations between NoSql and Data-Warehouse technologies/theories? What concepts they share? What are the basic differences between them? How do you think each could be benefits/enriches from the other? I think your ideas should be helpful for the future of both technologies. UPDATE : Some useful links: Integrating NoSQL in the Data Warehouse NoSQL and Data Warehousing Are You Ready for Big Data? 2nd UPDATE: MongoDB, BI and Non-Relational Databases 回答1: Data Warehouses have very

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . What are the best practices for NoSQL Databases, OODBs or whatever other acronyms may exist for them? For example, I've often seen a

问题 It seems that my searching for how to do this brings back results that are a year old and apparently no longer work or I am not doing something correctly. Through the MongoDB command line, I have run this for indexing: db.collectiontest.ensureIndex( { "$**": "text" }, { name: "TextIndex" } ) Did this based on the example at http://docs.mongodb.org/manual/tutorial/create-text-index-on-multiple-fields/ I do not receive an error when that is executed. Here are 2 of the Stackoverflow postings I