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A catch-all term describing database systems using various non-relational models. Such systems are usually engineered to be high-performance.

8
votes
This is a tough question in the sense that there are several NoSQL databases out there, and they're all slightly (sometimes radically) different from each other. An important concept to understand … for NoSQL technology is that of Brewer's CAP Theorem, so I've provided a link to a good article on it. For a brief, graphical overview on the CAP Theorem, you should also look at Nathan Hurst's blog …
answered Apr 9 '12 by Aaron
2
votes
Would I loose that data, or not ? Good question! As outlined in the DataStax documentation section on The Write Path To Compaction, you would not lose data. As you can see, when Cassandra p …
answered Aug 4 '15 by Aaron
1
vote
I'll try to address your concerns one at a time. Cassandra doesn't store the rows in any ordered way, so simply adding LIMIT X to the CQL query returns random-ish rows. The ORDER BY command i …
answered Sep 17 '14 by Aaron
1
vote
My team (of five) and I currently support 700+ Cassandra nodes across 30+ clusters in production. We use Spinnaker to help manage Cassandra in our external cloud. If a node gets blown away, it does …
answered Feb 28 '18 by Aaron
1
vote
In Cassandra you need to take a query-based modeling approach. In your case, I would create a similarly-structured query table like this: CREATE TABLE topicbyuser ( topic_id text, user_id te …
answered Nov 14 '14 by Aaron
5
votes
Which version did you download and install? If you have 64-bit Windows 8, you should download and install the build marked with "2008R2+". Their download page indicates that: The Windows 2008+ b …
answered Apr 14 '13 by Aaron
1
vote
The system keyspace is where a Cassandra node maintains information about itself and other nodes. So things like network addresses, responsible token ranges, status from gossip, hints, schema, and ot …
answered Oct 4 '16 by Aaron
9
votes
Right now the table only has about 320k records and I can use ALLOW FILTERING with no problem, but I realize this might not always be the case. So here's the thing: Cassandra is very good at quer …
answered Aug 25 '17 by Aaron