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Teradata - Explain parallel distribution and subtable concept in teradata?




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asked mar September 20, 2014 06:37 AM  

Explain parallel distribution and subtable concept in teradata?


           

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answered By vishnoiprem   0  
Parallel distribution: Teradata stores the data uniformly. Ideally, every amp should have equal no of rows from each table in vdisks.
Based on the primary index, the distribution of data would be uniform on amps.

Sub table: This table is created when a secondary Index is created on the table, it will have rowid,data and hash value for the data. It is used to fetch the data using secondary index.
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