15.00 - 15.10 - Parsing Engine - Teradata Database

Teradata Database Introduction to Teradata

Product
Teradata Database
Release Number
15.00
15.10
Content Type
User Guide
Publication ID
B035-1091-151K
Language
English (United States)
Last Update
2018-09-25

The PE is the vproc that communicates with the client system on one side and with the AMPs (via the BYNET) on the other side.

Each PE executes the database software that manages sessions, decomposes SQL statements into steps, possibly in parallel, and returns the answer rows to the requesting client.

The PE software consists of the following elements.

 

Parsing Engine Elements

Process

Parser

Decomposes SQL into relational data management processing steps.

Optimizer

Determines the most efficient path to access data.

Generator

Generates and packages steps.

Dispatcher

Receives processing steps from the parser and sends them to the appropriate AMPs via the BYNET.

Monitors the completion of steps and handles errors encountered during processing.

Session Control

  • Manages session activities, such as logon, password validation, and logoff.
  • Recovers sessions following client or server failures.