17.10 - SysChangeThresholdOption - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - Database Utilities

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Configuration
Publication ID
B035-1102-171K
Language
English (United States)

Specifies whether Vantage should automatically determine an appropriate data change threshold for statistics recollection.

This field is used only if the DefaultUserChangeThreshold setting is disabled (set to zero) when a COLLECT STATISTICS SQL statement does not specify the USING THRESHOLD PERCENT option.

Field Group

Optimizer Statistics

Settings

Value Description
0 Use Teradata default, currently equivalent to setting 1.
1 Enables system-determined change threshold checking in statistics collection when DBQL ObjectUsage (update/delete/insert counts) is enabled.
2 Enables system-determined change threshold checking in statistics collection regardless of ObjectUsage setting in DBQL logging options.
3 Disables system-determined change threshold.

Default

0

Changes Take Effect

After the DBS Control Record has been written.

Usage Notes

Statistics are used by the optimizer to improve query performance.

Related Information

For more information on… See…
Optimizer statistics fields