Misc no SQL DB comparison from InfoWorld

1. NoSQL standouts: The best document databases

part2

Here we’ve profiled seven of the best known and most widely used document databases. Four of the seven—CouchDB, Couchbase Server, MongoDB, and RethinkDB—are open source projects with few or no practical barriers to getting started; Couchbase and MongoDB are also available in supported enterprise editions under commercial licenses. The other three—Amazon DynamoDB, Google Firebase, and IBM Cloudant—are hosted services from major cloud vendors, where close integration with other services in those clouds is a big draw.

	Amazon DynamoDB	Cosmos DB	Couchbase	CouchDB	Google Firebase	IBM Cloudant	MarkLogic	MongoDB	RethinkDB
Platforms	Cloud-only	Cloud-only	LWM	LWMIAO	Cloud-only	Cloud-only	LWMS	LWMS	LWM
Query systems	REST API	MongoDB wire protocol	Memcached protocol, REST API	REST API	REST/JavaScript API	REST API	REST API	JSON-based API, partial REST API	ReQL query language, REST API
SQL querying	No1	Yes	Via N1QL language	No	No	No	Yes	No1	No
Strong typing	Yes	Yes	Yes	No	Yes	No	For XML schemas	Yes	Yes
Native joins	No	Yes	Yes	No	No	No	Yes	Yes	Yes
Sharding partitioning	Yes	Yes	Yes	Yes	NA	Yes	Yes	Yes	Yes2
Clustering	NA	Yes	Yes	Yes	NA	NA	Yes	Yes	Yes
Replication	Yes	Yes	Yes	Yes	NA	Yes	Yes	Yes	Per table
Consistency: Immediate	Per read	Yes	Per overall	No	Connected clients	No	Yes	Per write	Per document
Consistency: Eventual	Yes	Yes	Yes	Yes	Offline clients	Yes	Yes	Yes	Entire database
Concurrency	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
In-memory operations	NA	NA	No	No	NA	No	NA	Yes3	No
Stored procedures	No	JavaScript	JavaScript4	JavaScript4	Rules	JavaScript4	XQuery Module	JavaScript	No
Transactions	By app	Yes	Single documents	Single documents	Yes	Single documents	Single documents	Single documents5	Single documents
Current version	NA	NA	5.0 (Oct. 2017)	2.1.1 (Nov. 2017)	NA	NA	9.0 (May 2016)	3.4.10 (Oct. 2017)	2.3.6 (Jul. 2017)
Initial release	2012	2017	2011	2005	2012	2010	2005	2009	2009

key: L=Linux, W=Windows, M=MacOS, S=Solaris, I=iOS, A=Android, O=other mobile,

1. Third-party tools may provide this functionality. 2. Per table. 3. Enterprise edition only. 4. View functions only. 5. Multidocument transactions are also available, but not on sharded clusters.

1. DynamoDB

similar ideas to create Apache Cassandra by co-developer
Amazon’s DynamoDB document store began life in 2012 as an extension of Amazon’s SimpleDB. Under the hood it is powered by a key-value store, Dynamo.
. DynamoDB offers developers useful integrations with other services in the Amazon cloud. Triggers, for instance, can be set up by way of AWS Lambda functions. Amazon’s BI and analysis tools are also nearby.

2. Microsoft Azure Cosmos DB

ambitious project: Cosmos DB can serve as a document database, a columnar database, a graph database, or a key-value store
provides an API compatible with the popular MongoDB

3. CouchBase Server

Couchbase was built on work done in CouchDB and Membase
It’s a document database and distributed key-value store rolled into one, with advanced features like automated failover and cross-datacenter replication, intended for enterprise use cases
. SQL-like query language called N1QL
. Couchbase has native support for the Memcached protocol

4. MongoDB

MongoDB is easily the most widely deployed document database
It embodies most of the key concepts found in document databases and NoSQL systems generally: schemaless storage, a scale-out architecture, and a shared-nothing design.
. Recent addition: in-memory processing, a SQL-like interface through third-party data exploration and BI tools like Tableau, and the ability to perform recursive graph queries on document data

5. RethinkDB

The big innovation behind RethinkDB is a built-in change notification system that streams live updates to applications. In the words of its introductory documentation, “instead of polling for changes, the developer can tell the database to continuously push updated query results to applications in realtime.”
RethinkDB lacks native support for SQL, but includes a querying system called ReQL

2 NoSQL standouts: The best key-value databases compared

	Aerospike	Hazelcast IMDG	Microsoft Azure Cosmos DB	Memcached	Redis
Platforms	LWMO	Java	Cloud-only	LWMO	LWMO
Current version	3.14.1.1	3.9	N/A	1.5.1	4.0.1
Initial release	2012	2008	2017	2003	2009
License	AGPL	Apache 2	Proprietary	BSD	BSD
Disk-backed	Yes	No	Yes	No	YesBSD
Clustering	Yes	Yes	Yes	No	Yes
Sharding/partitioning	Yes	Yes	Yes	No	Yes
Native scripting	Yes	Java	Yes	No	Yes
Transactions	Per key	Yes	Yes	No	Yes
Embeddable	Yes*	Yes	No	Yes*	Yes*

3 NoSQL grudge match: MongoDB vs. Couchbase Server

MongoDB combines the benefits of immense popularity, support for simple graph searches, and the ability to perform SQL queries via a BI connector. Couchbase has its own large community of users, a performant key-value architecture, and a SQL-like query language capable of navigating nested document structures.