Pythian Acquires

Today, we officially announced the fact that has been acquired by Pythian. I first met its founder, Paul Vallee, in 2007. Paul reached out to me about joining Pythian to found a San Francisco presence. At the time, I was one year into PalominoDB, and was having such a good time being my own…

vCPU sharing in EC2: HVM to the rescue?


I’ve been doing some testing to clarify what a vCPU in Amazon Web Services actually is. Over the course of the testing, I experienced inconsistent results on a 2-thread test on a 4-vCPU m3.xlarge system, due to the mislabeling of the vCPUs as independent single-core processors by the Linux kernel. This issue manifests itself in…

Welcome to Employees and Clients


Today, we announced that Pythian has entered into an agreement to acquire, itself the result of a recent merger between PalominoDB and DriveDev. I want to start with a hearty welcome to the 40+ new esteemed collaborators joining our firm today. Simultaneously, I want to welcome’s valued clients to the Pythian family. I…

Oracle Database: Query to List All Statistics Tables

If you were a big fan of manual database upgrade steps, perhaps you would have come across this step many times in your life while reading MOS notes, upgrade guides, etc. Upgrade Statistics Tables Created by the DBMS_STATS Package If you created statistics tables using the DBMS_STATS.CREATE_STAT_TABLE procedure, then upgrade these tables by executing the following…

Ambari Blueprints and One-Touch Hadoop Clusters

For those who aren’t familiar, Apache Ambari is the best open source solution for managing your Hadoop cluster: it’s capable of adding nodes, assigning roles, managing configuration and monitoring cluster health. Ambari is HortonWorks’ version of Cloudera Manager and MapR’s Warden, and it has been steadily improving with every release. As of version 1.5.1, Ambari added support for a declarative configuration (called a Blueprint) which makes it easy to automatically create repeatable clusters in the cloud. I’ll give an example of how to use Ambari Blueprints, and compare them with existing one-touch deployment methods for other distributions.

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