16.10 - Storage Group - Teradata Database

Teradata Database Utilities

Teradata Database
Release Number
June 2017
English (United States)
Last Update


Each field in the Storage group specifies the initial temperature that will be assigned to data loaded or inserted into empty subtables of a particular type. The temperature represents the expected frequency of access to that data, and can determine whether the data is compressed, and where the data is stored.

Because the frequency of access is continually monitored by Teradata Database, the temperature can change over time from the initial temperature setting.

The individual Storage setting names and defaults are listed below. These fields are relevant and visible only when temperature-based block level compression (TBBLC) is enabled, or on systems that have licensed Teradata Virtual Storage (VS).

Storage Field Default Temperature
DEPOT Temperature HOT
GLOBAL TEMP Fallback Temperature WARM
GLOBAL TEMP Fallback CLOB Temperature WARM
GLOBAL TEMP Primary Temperature WARM
GLOBAL TEMP Primary CLOB Temperature WARM
PERM Fallback Temperature WARM
PERM Fallback CLOB Temperature WARM
PERM Primary Temperature

The Parallel Upgrade Tool (PUT) sets the default for PERM primary data based on the system configuration. For some configurations the default is HOT.

PERM Primary CLOB Temperature WARM
SPOOL Temperature HOT
WAL Temperature HOT
All Other Temperature

Controls initial data temperature set for data loaded into empty subtables that are not specifically controlled by other Storage group fields.


Valid Settings

Setting Description
HOT Data is expected to be accessed frequently.
WARM Data is expected to be accessed moderately frequently.
COLD Data is expected to be accessed infrequently.
DEFAULT Uses the default temperature for this type of data. Resets the field to the factory default value for the specified table or data type.

Changes Take Effect

After the DBS Control record has been written.

Usage Notes

The Storage field settings are honored when data is loaded into empty tables by any of the following techniques:

  • INSERT/INSERT ... SELECT statement
  • CREATE TABLE AS ... WITH DATA statement
  • CREATE JI statement
  • Load utilities TPump, FastLoad, MultiLoad, Teradata Parallel Transporter
  • Teradata Archive/Recovery (ARC) utility
  • Table Rebuild utility
The TVSTemperature query bands and the Ferret FORCE command override these storage settings.

Because data temperature is assigned at the cylinder level, after initial assignment, data in different partitions of a partitioned table can have different temperatures.

For systems licensed to use Teradata VS, data can be automatically moved (migrated) to faster or slower grades of storage as data temperatures change due to changing data access patterns.