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26th November 2020, Thursday
 
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System Cassandra (Datastax) PostgresDB
 Version 2.1 10.5 release in august 2018
 Drawbacks Paid Version, License Fees, Support Fees Primarily a relational database
 Advantages DB Failover capability, Enterprise support available Open Source Database with a nice ecosystem with periodic upgrades
 Website www.datastax.com postgresql.org
 XML Support Not Available.Generally not available in NOSQL DB. Well known RDBMS have this feature yes
 Name Cassandra (Datastax) Postgres SQL
 Languages Supported C C# C++ Java Node.js PHP Python Ruby C C# C++ Cobol Delphi Fortran Java JCL Perl PHP Python Ruby Visual Basic
 JSON Support yes yes
 Brief description DataStax was built on the open source NoSQL database Apache Cassandra. Cassandra was initially developed internally at Facebook to handle large data sets across multiple servers. It was released as an Apache open source project in 2008 PostgreSQL, often simply Postgres, is an object-relational database management system (ORDBMS) with an emphasis on extensibility and standards compliance. It can handle workloads ranging from small single-machine applications to large Internet-facing applications (or for data warehousing) with many concurrent users; on macOS Server, PostgreSQL is the default database and it is also available for Microsoft Windows and Linux (supplied in most distributions). PostgreSQL is ACID-compliant and transactional. PostgreSQL has updatable views and materialized views, triggers, foreign keys; supports functions and stored procedures, and other expandability. PostgreSQL is developed by the PostgreSQL Global Development Group, a diverse group of many companies and individual contributors.It is free and open-source, released under the terms of the PostgreSQL License, a permissive software license.
 Database Model Primarily a NoSQL database Primarily a relational database
 Technical Documentation docs.datastax.com www.postgresql.org/­docs/­manuals
 License Commercial Commercial
 Cloud-based / SaaS Virtual Machine Images available in AWS and Azure Marketplace. Available as a Hybrid Cloud SaaS Option - NA Available in AWS and Azure SaaS Option - Available in Google Cloud
 Implementation Language C,C++ C,C++
 Operating System Supported Linux, OS X, FreeBSD, HP-UX, Linux, OS X, Solaris, Unix, Windows
 Options for Integration / Access API CQL (Cassandra Query Language is like SQL) Gremlin Native C library JDBC ODBC
 Consistency Highly Consistent Highly Consistent
 Foreign Keys No Yes
 Streaming Support Yes No
 Analytics Support One of the core features is to build timeseries apps Need to buy Netezza
 Data Storage Schema Key Value Column Family NoSQL DB Relational Database
 Notable Users Samsung Smartthings, ING Vysya , Safeway Most of the startups and SMEs use this stable open source database with a nice ecosystem of tools supporting it
 Key Differentiator Graph DB built natively on top of the core NoSQL Column Store. Graph and NoSQL component share the same core. Enterprise version of Cassandra supports HighAvailability (HA) Go to Open Source Database. Earlier Mysql was the most popular but new features have been slow after oracle acquisition.
 Concurrency Yes Yes
 Partitioning Yes No
 Replication Yes Yes
 Secondary Indexes Yes Yes
 SchemaLess Yes No
 SQL Query No, but CQL is similar to SQL Yes