15.00 - Configuration Maps and Reconfiguration - Teradata Database

Teradata Database Support Utilities

prodname
Teradata Database
vrm_release
15.00
category
Configuration
featnum
B035-1180-015K

Configuration Maps and Reconfiguration

The Configuration utility describes the complete Teradata Database system in the new configuration map area.

As the Teradata Database system grows and changes, use Configuration to revise the new configuration map to reflect the following types of changes to the Teradata Database system:

  • Addition and deletion of vprocs and hosts
  • Changes to cluster assignments
  • Use the configuration maps to perform these tasks:

  • Store the identification and status of each vproc in the Teradata Database system
  • Identify the AMPs that comprise each AMP cluster
  • Identify each PE and its associated host
  • The Teradata Database system contains these two configuration maps:

  • The current configuration map, which describes the current arrangement and status of vprocs in the Teradata Database system
  • The new configuration map, which includes changes and additions to the configuration
  • The new configuration map serves as input to the Reconfiguration utility.

    Typically, Reconfiguration is used to alter the number of AMPs in a Teradata Database system. The new configuration map includes the status of each AMP in a Teradata Database system.

    After Configuration builds a new configuration map, Reconfiguration redefines the Teradata Database system configuration according to the new map. Reconfiguration copies the new configuration map to the current configuration map on each node.

    During reconfiguration, data is redistributed among AMPs if AMPs were added or deleted, if cluster assignments were changed, or if hash bucket sizes are changed. Redistribution causes hash bucket assignments to be recalculated. These assignments describe the AMPs responsible for primary data and the AMPs responsible for fallback data.

    Hash bucket arrays contain hash bucket assignments for each AMP:

  • Primary data rows for the current configuration
  • Fallback data rows for the current configuration
  • Primary data rows for the new configuration
  • Fallback data rows for the new configuration
  • Information that defines the new configuration is used during reconfiguration.