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22 Jan 2015

The Teradata JDBC Driver Engineering team receives a lot of questions about what happens when a JDBC connection is created. Let's clarify the concepts Laddered Concurrent Connect (LCC) versus COP Discovery versus logon, and review what the Teradata JDBC Driver does to create a JDBC connection.


First, some definitions...

"COP" stands for Communications Processor, and is a term originating from Teradata's earliest database appliances in the 1980s. In modern usage, a "COP" is a Teradata Database node that is running a Teradata Database Gateway process.

19 Jan 2015

As of Teradata Database 14.10.05 and 15.00.03, a simplified approach to determining which workload will support session management and parsing has been adopted  This posting describes this more straightforward approach which will be used starting in these 14.10 and 15.0 releases, and going forward in all future releases.

An earlier posting titled:  “A Closer Look at How to Setup a Parsing-Only Workload”  explains how session and parsing workload assignment takes place prior to this more simplified approach.  If you are on an earlier release, please see that posting from December 2014.

14 Jan 2015

There is a demand to have a functionality similar to the industry standard SHA256 hash function to condense RDBMs table content to a single value which is changing completely in case a single bit changes in multi million or billion row tables.