Database Requests and Responses - Teradata Tools and Utilities

Teradata® Call-Level Interface Version 2 Reference for Mainframe-Attached Systems

Product
Teradata Tools and Utilities
Release Number
17.00
Published
June 2020
Language
English (United States)
Last Update
2020-06-18
dita:mapPath
lvt1544831946862.ditamap
dita:ditavalPath
obe1474387269547.ditaval
dita:id
B035-2417
lifecycle
previous
Product Category
Teradata Tools and Utilities

Database requests are sent by an application to the database to initiate an action. Responses are sent by the database to the application to reflect the results of that action. Both requests and responses are associated with an established session. One or more Teradata SQL statements that are submitted to the database at the same time are called a Teradata SQL request. Having several statements in the same request saves message transfer time, a factor of interest to CPU-bound and I/O-bound programs or sites, since, for example, a two-statement multi-statement request uses half the CPU time of two single statement requests.

Most requests contain all of the data needed for their completion, but a few require additional data. For example, requests that insert a large database field, such as a picture or a program that runs within the database, first prompt CLIv2 to supply the data or program. The application then continues the request by providing the data or program.