Oracle R Enterprise 1.4: ore.make.names does not work for Oracle DB connections

Christos - Iraklis Tsatsoulis Oracle R 0 Comments

I have reported in the past about some unexpected behavior issues of Oracle R Enterprise 1.4 ore.make.names function; nevertheless, back then I had only tried it with Hive connections. I tried to use it today with an Oracle database connection, and it doesn’t seem to work. Here is a reproducible example in Oracle Big Data Lite VM 4.2.1, using the …

Manipulating Hive tables with Oracle R connectors for Hadoop

Christos - Iraklis Tsatsoulis Hadoop, Hive, Oracle R 0 Comments

In this post, we’ll have a look at how easy it is to manipulate Hive tables using Oracle R connectors for Hadoop (ORCH, presently known as Oracle R Advanced Analytics for Hadoop – ORAAH). We will use the weblog data from Athens Datathon 2015, which we have already loaded in a Hive table named weblogs, as described in more detail …

Using Ansible to install WebLogic 12c R2 and Fussion Middleware

Chris Vezalis Ansible, DEVOPS, Fusion Middleware, Linux, Oracle ADF, Oracle Linux, Vagrant, WebLogic 0 Comments

Before a couple of days Oracle release WebLogic 12c R2 (12.2.1). There are a lot of cool features like Java EE 7 support and Multitenancy Support for WebLogic domains. Installation of WebLogic server along with ADF runtime (Fusion Middleware Infrastructure) are not hard but requires a lot of parameters to be configured and a significant time when you need to …

Augmenting PCA functionality in Spark 1.5

Christos - Iraklis Tsatsoulis Dimensionality Reduction, Spark 7 Comments

Surprisingly enough, although the relatively new Spark ML library (not to be confused with Spark MLlib) includes a method for principal components analysis (PCA), there is no way to extract some very useful information regarding the PCA transformation, namely the resulting eigenvalues (check the Python API documentation); and, without the eigenvalues, one cannot compute the proportion of variance explained (PVE), …