Extensibility covers the mechanisms by which you, as the user or developer, can extend the functionality of the Teradata Database, for example with the use of User Defined Functions, or UDFs.

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Running Unsupported Queries from a Stored Procedure


Stored Procedures


SQL Stored Procedures were added to Teradata around 2003 with the release of Teradata V2R5.1. Since then the capabilities of SQL Stored Procedure s has been expanded. However, there are still some queries that cannot be run directly from within a Stored Procedure.

 

In database multiple variable linear regression using the CM_Solve Table Operator

In a prior article [1] we described how to use the Teradata 14.10 CalcMatrix operator and R to perform a multiple variable linear regression analysis. This article extends that concept with a comprehensive in database solution by introducing a new in database table operator named “CM_Solve”. This approach has value in cases when you want to solve a large number of independent systems of equations or you simply do NOT want to use the R client for solving the system of equations based on the SSCP matrix.

In database linear regression using the CalcMatrix table operator

Linear Regression

In statistics, linear regression is an approach to model the relationship between a scalar dependent variable y and one or more independent variables denoted x. Linear regression is one of the oldest and most fundamental types of analysis in statistics. The British scientist Sir Francis Galton originally developed it in the latter part of the 19th century. The term "regression" derives from the nature of his original study in which he found that the children of both tall and short parents tend to "revert" or "regress" toward average heights.

K-means clustering and Teradata 14.10 table operators

Table Operators

This article discusses how to implement a Teradata 14.10 table operator using K-means clustering as an example use case. 

The Heatmap Table Function is now available

As part of Teradata Database 14.10 Teradata Intelligent Memory (TIM) feature, a table function was developed to provide the heatmap report for a specific AMP for database object(s) for systems in which data temperature collection is enabled[1].     This HeatMap table function is being provided for sites that are interested in looking at the relative temperature of tables, which tables (cylinders) are targeted for the TIM cache and which tables are targeted for what temperature range

How to Create and Debug a CUDF under an Authorized User

SQL provides a set of useful functions, but they might not satisfy all of the particular requirements you have to process your data.

User-defined functions (UDFs) allow you to extend SQL by writing your own functions in the C/C++ programming languages, installing them on the database, and then using them like standard SQL functions.

Teradata Database supports three types of CUDFs (C/C++ User-Defined Functions). They are scalar UDF, aggregate UDF and window aggregate UDF, and table UDF. 

Teradata XML Services

Teradata XML Services provide assistance in database transformation of XML structures to and from relational structures. This is primarily an enterprise fit feature. XML in this context is regarded as a data format that is used to describe incoming or outgoing warehouse data. A key concept for this feature is that we are not transforming to store XML but rather to maintain a relational data model or to integrate relational data into an enterprise XML message structure! The relational data model is bested suited for enterprise analytics. XML structures are best suited for enterprise integration.

UDF Debugging in a Controlled Environment

Customers are currently leveraging Teradata's features such as User Defined Functions (UDFs) and External Stored Procedures (XSPs) to develop complex applications.

The aim of this set articles is to show the user how to use the Eclipse IDE to debug in a single-node, controlled, non-production environment:

  • Java or C/C++ User Defined Functions (UDFs)
  • Java or C/C++ External Stored Procedures (XSPs)

The audience for this set of articles ranges from Teradata associates within the R&D and Professional Services organizations to  Teradata Customer and Partner developers who want to debug a UDF/XSP running on their  DBS VM before installing it on a production system.

VNC Easy Setup

Virtual Network Computing (VNC) is a graphical desktop sharing system that uses the RFB protocol (remote framebuffer) to remotely control another computer. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.

Here we describe a simple procedure to show how to connect to a DBS from a client by VNC software.

Install VNC Server in Remote Server

The VNC Server is installed by default in Linux. You can verify this using the following command.

How to Create and Debug a CXSP using Eclipse

In addition to stored procedures, which use SQL control and condition-handling statements, input and output parameters, and local variables to provide applications with a server-based, precompiled procedural interface, Teradata Database supports external stored procedures.

You can write XSPs (eXternal Stored Procedures) in the C or C++ programming language, install them on the database, and then use the SQL CALL statement to call them like other stored procedures.

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