How to Load Oracle and Hive Tables using OHSH (Part 1 - Introduction)
How to Load Oracle and Hive Tables using OHSH (Part 2 - Configuration and CLI Usage)
How to Load Oracle and Hive Tables with OHSH (Part 3 - Loading Oracle Tables)
How to Load Oracle and Hive Tables Using OHSH (Part 4 - Loading Hive Tables)
The following links discuss two Oracle Connectors for Hadoop: Oracle Loader for Hadoop (OLH) and Oracle SQL Connector to HDFS (OSCH). These are two of the underlying technologies that OHSH uses which can also be directly used by power users. They also provide better insight on what exactly is happening under-the-covers when using the parallelism of Oracle external tables or Hadoop Map/Reduce to load Oracle tables.
How to Load Oracle Tables From Hadoop Tutorial (Part 1 - Overview)
How to Load Oracle Tables From Hadoop Tutorial (Part 2 - Hello World)
How to Load Oracle Tables From Hadoop Tutorial (Part 3 - Direct Path)
How to Load Oracle Tables From Hadoop Tutorial (Part 4 - OSCH Hello World)
How to Load Oracle Tables From Hadoop Tutorial (Part 5 - Leveraging Parallelism in OSCH)
How to Load Oracle Tables From Hadoop Tutorial (Part 6 - The Data Pump Solution)