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System Azure Cosmos DB ElasticSearch
 Name Azure Cosmos DB ElasticSearch
 Version NA Version 6.4.1 (released in September 2018)
 Drawbacks 1.Most often compared with MongoDB. Unlike Mongo DB does not support joins 2.Managed Database which can be used only within Azure/Microsoft framework Elasticsearch AMI not available
 Advantages NA Large number of drivers present for integration
 Languages Supported .net, C#, Javascript .Net Groovy Java JavaScript Perl PHP Python Ruby
 Website www.azure.microsoft.com/­services/­cosmos-db www.elastic.co/­products/­elasticsearch
 XML Support no no
 JSON Support yes yes
 Brief description 1.Globally distributed, horizontally scalable, multi-model database service 2.Earlier called Azure Document DB. Skype, Xbox uses this DB, Office, Active Directory and MSC (all Microsoft products) Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents.
 Database Model Key Value DB Key Value NoSQL Model
 Technical Documentation docs.microsoft.com/­en-us/­azure/­cosmos-db www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html
 License commercial on azure cloud. Open Source. Commercial version with HA available with redislabs.com
 Cloud-based / SaaS Azure Cloud based ElasticSearch Cloud Cluster available from ElasticSearch
 Implementation Language NA C,C++
 Operating System Supported Linux , OS X, Windows Linux OS X Solaris Windows
 Options for Integration / Access API Rest API , MongoDB drivers Proprietary protocol using JSON
 Consistency Eventual consistency Highly Consistent
 Foreign Keys No No
 Streaming Support No Yes
 Analytics Support NA NA
 Data Storage Schema Multi Model Database Inverted Index
 Notable Users -- --
 Key Differentiator -- No known Enterprise Competitor apart from Amazaon Cloud Search
 Concurrency -- Yes
 Partitioning -- Yes
 Replication -- Yes
 Secondary Indexes -- Yes
 SchemaLess -- Yes
 SQL Query -- No