PostgreSQL 9.4 will replace the default JSON column type with Hstore.
PostgreSQL 9.4 will be reintroducing Hstore as the column type of choice for document-style data. This supersedes PostgreSQL’s JSON support which was introduced in version 9.0. Being a string-based representation, JSON is significantly slower than the binary structure of HStore. And with the addition of Boolean and integer support, the new Hstore is semantically equivalent to JSON. In practical terms this allows two-way conversions between the formats using just a casting operator.
Amazon RDS adds (beta) support for PostgreSQL.. Pretty much everything is supported, including PostGIS.
Original title and link: Two more things about PostgreSQL ( ©myNoSQL)
I’ve learned that there’s an Apache Hadoop compatibility guide that covers API, wire, Java binary compatibility, any many other such aspects.
✚ Karthik Kambatla posted on Cloudera’s blog Writing Hadoop programs that work across releases that looks at the Hadoop API annotations and compatibility policies.
Original title and link: Apache Hadoop Compatibility Guide ( ©myNoSQL)
Just in case you ever needed an infographic for the 4 V’s of big data, IBM has one for you.
Original title and link: The Four V’s - Volume, Velocity, Variety, Veracity Infographic ( ©myNoSQL)
Carnegie Mellon has made available its “Introduction to machine learning” course available online. Free.
Original title and link: Carnegie Mellon’s Introduction to machine learning course ( ©myNoSQL)