15.00 - DefaultTimeThreshold - Teradata Database

Teradata Database Utilities

Product
Teradata Database
Release Number
15.00
Content Type
Configuration
Publication ID
B035-1102-015K
Language
English (United States)
Last Update
2018-09-25

DefaultTimeThreshold

Purpose  

Specifies the amount of time in days that must elapse before statistics will be recollected on a table. If fewer than the set number of days has passed since the previous statistics collection, no new statistics will be collected.

This setting is used when a COLLECT STATISTICS SQL statement does not specify the USING THRESHOLD DAYS option.

Field Group

Optimizer Statistics

Valid Range

0 through 9999

Default

0, indicating time threshold checks are disabled.

Changes Take Effect

After the DBS Control Record has been written.

Usage Notes  

Statistics are used by the optimizer to improve query performance.

When cost profiles are in effect, this setting can be overridden by a cost profile constant value.

Related Topics

 

For more information on…

See…

Optimizer statistics fields

  • “DefaultUserChangeThreshold” on page 299
  • “SysChangeThresholdOption” on page 446
  • “SysSampleOption” on page 450
  • Cost profiles

  • DIAGNOSTIC SET PROFILE in SQL Data Manipulation Language
  • Target Level Emulation chapter in SQL Request and Transaction Processing