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From Mich Talebzadeh <mich.talebza...@gmail.com>
Subject Accessing Teradata DW data from Spark
Date Wed, 10 Jun 2020 16:49:36 GMT
Using JDBC drivers much like accessing Oracle data, one can utilise the
power of Spark on Teradata via JDBC drivers.

I have seen connections in some articles which indicates this process is
pretty mature.

My question is if anyone has done this work and how is performance in Spark
vis-a-vis running the same code on Teradata itself. For example in Oracle
one can force parallel processing by using numPartitions

val s = HiveContext.read.format("jdbc").options(
       Map("url" -> _ORACLEserver,
       "dbtable" -> "(SELECT ID FROM scratchpad.dummy4)",
       "partitionColumn" -> "ID",
       "lowerBound" -> minID,
       "upperBound" -> maxID,
       "numPartitions" -> "5",
       "user" -> _username,
       "password" -> _password)).load

As both Oracle & Teradata are data warehouses, this may work. The intention
is to read from Teradata initially as tactical and use Hadoop/Hive/Spark as
strategic.

Obviously the underlying tables reading from Hive compared to Teradata will
be different. However the SQL to fetch, slice and dice data will be similar.

Let me know your thoughts

Thanks



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