Top "Nosql" questions

NoSQL (sometimes expanded to "not only SQL") is a broad class of database management systems that differ from the classic model of the relational database management system (RDBMS) in some significant ways.

Storing null vs not storing the key at all in MongoDB

It seems to me that when you are creating a Mongo document and have a field {key: value} which is …

mongodb mongodb-query document-database nosql
NoSQL: Getting the latest values from tables DynamoDB/Azure Table Storage

I have a little problem that needs some suggestions: Lets say we have a few hundred data tables with a …

nosql amazon-dynamodb azure-table-storage
mongo group and count with condition

I'm trying to group a set of documents and count them based on their value. For example { "_id" : 1, "item" : "abc1", "…

mongodb mongodb-query aggregation-framework nosql
Which embedded DB written in Java for a simple key/value store?

I recently asked a question about Neo4j, which I got working and which seems nice. It's embeddable and it's …

java database web-applications nosql embedded-database
Full-text search in NoSQL databases

Has anyone here have any experience deploying a real online system that had a full text search in any of …

database full-text-search nosql couchdb riak
How to update multiple items in a DynamoDB table at once

I'm using DynamoDB and I need to update a specific attribute on multiple records. Writing my requirement in pseudo-language I …

amazon-web-services amazon-dynamodb nosql
Switching from MySQL to Cassandra - Pros/Cons?

For a bit of background - this question deals with a project running on a single small EC2 instance, and …

mysql django migration nosql cassandra
Why many refer to Cassandra as a Column oriented database?

Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. There are many …

cassandra nosql data-modeling column-oriented wide-column-store
Redis, CouchDB or Cassandra?

What are the strengths and weaknesses of the various NoSQL databases available? In particular, it seems like Redis is weak …

nosql couchdb cassandra redis
How reliable is ElasticSearch as a primary datastore against factors like write loss, data availability

I am working on a project with a requirement of coming up with a generic dashboard where a users can …

elasticsearch full-text-search search-engine nosql