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Utility Session Management - It's Inside the Database in Teradata 13.10! (UPDATED) - comment by carrie

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Response to Geeta's second posting above:
 
In 14.0, you will still have a workload evaluation order, but you no longer have the ability to change the workload evaluation order across different states.
 
This is because of the  14.0 enhancement that greatly reduced the overhead of changing states in TASM.
 
In 14.0 and later releases, requests stay in the delay queue and are re-evaluated in place, rather than the delay queue being flushed and requests being sent back to the source and resubmitted.
 
Delay queues are no longer repopulated and recounted, significantly reducing message passing overhead.  In addition, internal structures such as the TDWM cache, are not deleted and rebuilt, but rather tweaked in place, a much more modest effort.
 
As a result, state changes are more efficient and much faster, especially at busy times.  But in order to accomplish this, counters have to be maintained for all throttles across all states, even when the throttle is not active.   For this reason, the ability of changing evaluation order by state had to be removed.
 
Thanks, -Carrie
 


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