Performance Characteristics of SELECT AND CONSUME Statements - Analytics Database - Teradata Vantage

SQL Data Manipulation Language

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-04-05
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lifecycle
latest
Product Category
Teradata Vantage™
The performance of SELECT AND CONSUME statements is:
  • Similar to that of selecting a single row from a base table using a USI.
  • More expensive than selecting a single row from a base table using a primary index.
If a queue table does not contain rows when you perform a SELECT AND CONSUME statement, its containing transaction enters a delay state until one of the following occurs:
  • A row is inserted into the queue table.
  • The transaction aborts as a result of one of these reasons.
    • Direct user intervention, such as an ABORT statement
    • Indirect user intervention, such as a DROP TABLE statement on the queue table