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MADlib’s Journey To Apache: Math, Stats & Machine Learning Methods

We are excited to announce that our collaborative, open source math, statistics, and machine learning library, known as MADlib, is entering Apache incubation. In addition to hearing from a few MADlib industry experts, this post explains what MADlib is, provides a short history, describes why it is moving to Apache®, outlines its value in the enterprise, and illustrates the current community membership.

6 Key Topics Discussed At September’s PostgreSQL Conference in China

Last Saturday, Pivotal hosted a "small" PostgreSQL Conference in Beijing. At least that is what we initially asked for: "a little Meetup, one or two speakers". Over 100 people showed up and discussed some pressing issues regarding the database market in China, including Postgres relationship with products like Pivotal Greenplum Database, MySQL and Apache Hadoop, as well as many of the open source community efforts across the broader community.

Pivotal People—Gavin Sherry on Engineering PostgreSQL, Greenplum, HAWQ and More

In this post, we do a Q&A session with Pivotal's vice president of engineering for data, Gavin Sherry. Gavin has played a major role in developing a number of well-known data-centric products, including significant contributions to PostgreSQL. Before big data was common, he joined Greenplum to help build the massively parallel processing engine for analyzing petabytes of data. At Pivotal, he helped lead the development of HAWQ, creating a new era of data platforms with SQL on Hadoop. In this interview, he shares his history as well as his views on where the market is heading and how his products are being used to help companies become more data driven.

Updating PostgreSQL-based Open Source Machine Learning Library from Google Summer of Code

The Google Summer of Code included a project to update MADlib, the open source machine learning library written for PostgreSQL as well as Pivotal Greenplum Analytic Data Warehouse.

Access your database's best features with Sequel

Sequel is a wonderful library for interacting with relational databases. Some of my favorite aspects: 1. Out-of-the box support for foreign key constraints. 2. Straightforward migration DSL. 3. Support for all major free RDBMSes and even some proprietary ones. Also JRuby support through JDBC.

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Cloud Foundry Integration for Eclipse Can Now Launch External Command-line Applications Using Service Tunnels

In the course of developing, testing and deploying cloud applications, developers sometimes need to directly access the application data. The Cloud Foundry Integration for Eclipse advances this capability and now features the ability to launch external command-line applications for Cloud Foundry services like MySQL and PostgreSQL.

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Rails and SQL Views – Part 1

The project we’re currently working on has a fairly system wide requirement to have objects in different “states” as a result of user actions.

The client wanted to be able to see both the current status, and a history of all the statuses each object has been in.

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iFrame you frame…

Helps undefined method `fields' for nil

We keep getting this error across multiple projects & machines, with different versions of the pg gem and the PostgreSQL server, with varying consistency. Switching the tests to sqlite seems to fix it.

Failure/Error: Unable to find matching line from backtrace ActiveRecord::StatementInvalid: NoMethodError: undefined method `fields' for nil:NilClass: SELECT "locations".* FROM "locations" WHERE "locations"."id" IN (11, 10, 5, 4, 1, 3, 2)

It appears that PG::Connection#async_exec is returning nil for some queries.

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Cloud Foundry Now Supports Play!

Cloud Foundry now supports Play 2.0 as a first-class framework. Play is a lightweight, stateless, web-friendly framework for Java and Scala. Developers can leverage this event-driven non-blocking IO architecture to build highly scalable applications. Play 1.0 applications were previously deployable to Cloud Foundry as WAR files.

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Protected: Using JRuby for Rails Applications on Cloud Foundry

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