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Message Posted: Tue, 21 Mar 2006 @ 19:51:26 GMT

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Naveen:

The BYNET interface board on each AMP maintains a hash map on each node because Teradata is a shared nothing architecture. Each AMP has its own processor, memory and disk.

Actually each node in a Teradata system has a set of four hash maps, each performing a different function.

Primary hash map for the current AMP configuration

FALLBACK hash map for the current AMP configuration

Primary hash map for a new AMP configuration

FALLBACK hash map for a new AMP configuration

Each Hash Map is an array of 65 536 entries (yes, the manual has a typo as Robert Meunier wrote).

I do not know if this answered your question but you can find more detailed information about hash maps in Teradata Database Design reference manual, Chapter 8.

Regards,

Otzmar

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