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Moutusi 38 posts Joined 03/13
12 Jun 2014
Index and stats on volatile table

As volatile table definition does not go into DD, how Indexes and stats works on volatile table?

Thanks, Moutusi
Raja_KT 1246 posts Joined 07/09
12 Jun 2014

From "SQL Request and Transaction Processing" document, page 210

 

Teradata Database automatically collects session-level derived statistics for

materialized global temporary and volatile tables that are populated with data during

the current session. The system uses session-level derived statistics in the same way it

uses other derived statistics to make cardinality estimates for, and cost evaluations of,

SQL requests. These session-level statistics are maintained in the global memory for a

session and are dropped when the session logs off.

 

Ypu can read more there.....

Raja K Thaw
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