NoSQL DBMS

Question

NoSQL

Good day! Please help me choose a DBMS that satisfies the following requirements:

1) Document-oriented (itself an ORM)
2) Change propagation technology (deployment)
3) Clustering (redundant storage + load balancing) OrientDB

was considered , but with the second point there is dull, or I did not understand something

Answer 1

CouchDB + Chef

Answer 2

BigCouch (https://cloudant.com/, github.com/cloudant/bigcouch )

Answer 3

I don't know about the second point, but check out MongoDB.

Answer 4

There is a good (albeit free) beginner course on OrientDB: https://www.udemy.com/orientdb-getting-started/
( using OrientDB 2.0 as an example).
After passing it, you will definitely want to try to make at least a small "touchstone" on OrientDB.
https://github.com/orientechnologies/orientdb/issu... :
" I'm running orientdb standalone server on a machine with 64gb ram and 4g swap space. Database has more than 300 millions edges and around 70 million vertices.
Each client performs insert/read/delete at around 10k qps(all combined).I have multiple such clients connecting to the
server.When qps is over 50k, the orientdb server crashes with Out of Memory(OOM) exception. "
For me personally, the figure of "50,000 requests per second" (with more than 370 million objects in the database) seems very suitable for a lot of "real" projects.