15.00 - Volatility of Indexed and Partitioning Column Values - Teradata Database

Teradata Database Design

prodname
Teradata Database
vrm_release
15.00
category
User Guide
featnum
B035-1094-015K

Volatility of Indexed and Partitioning Column Values

Primary indexes and row partitioning should be defined on columns that rarely, if ever, change. Changing the value of a primary index column or partitioning column almost certainly means that affected rows must be redistributed to different AMPs, which results in excessive I/O traffic on the BYNET and disk subsystems, or moved to a different partition on the same AMP.

This will minimize system-wide performance degradations caused by frequently changed primary index or partitioning column values.