Top "Nosql" questions

How do you query for "is not null" in Mongo?

I would like to execute a following query: db.mycollection.find(HAS IMAGE URL) What should be the correct syntax?

mongodb database nosql

Difference between scaling horizontally and vertically for databases

I have come across many NoSQL databases and SQL databases. There are varying parameters to measure the strength and weaknesses …

database database-design nosql scalability

Add new field to every document in a MongoDB collection

How can I add a new field to every document in an existent collection? I know how to update an …

mongodb field nosql

When to Redis? When to MongoDB?

What I want is not a comparison between Redis and MongoDB. I know they are different; the performance and the …

architecture mongodb nosql redis

Is mongodb running?

I have installed mongodb and the php drivers on my unix server. My question is how can I tell if …

mongodb unix database nosql

How can I run MongoDB as a Windows service?

How can I set up MongoDB so it can run as a Windows service?

mongodb windows-services nosql

MongoDB: How to update multiple documents with a single command?

I was surprised to find that the following example code only updates a single document: > db.test.save({"_id":1, "…

mongodb document nosql

When to use CouchDB over MongoDB and vice versa

I am stuck between these two NoSQL databases. In my project I will be creating a database within a database. …

mongodb performance comparison couchdb nosql

Cassandra port usage - how are the ports used?

When experimenting with Cassandra I've observed that Cassandra listens to the following ports: TCP *:8080 TCP *:8888 TCP *:57311 TCP *:57312 TCP 127.0.0.1:7000 TCP 127.0.0.1:9160 UDP 127.0.0.1:700 …

nosql cassandra

Is there a query language for JSON?

Is there a (roughly) SQL or XQuery-like language for querying JSON? I'm thinking of very small datasets that map nicely …

json nosql web-standards querying dynamic-queries