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Message Posted: Fri, 20 Dec 2013 @ 13:54:16 GMT


     
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Subj:   Re: Queue Tables
 
From:   Dieter Noeth

Hi David,

I use a queue table for stats collection, see developer.teradata.com/...

Usually SELECT AND CONSUME is called in WHILE or REPEAT loop. But when the queue is empty this loop will wait forever, you can do a SELECT COUNT before to determine the current number of rows to avoid peeking at each row before you consume it.

I couldn't do this as I use multiple SPs to process a single queue, so I insert a special row ('9999-12-31') to stop the queue when all rows are processed.

Whe the SP is called I decide to stop after all rows are processed (insert the special row when SP starts) or to run forever (there's a EXEC StopQueue macro which insert this special row).

Optionally I define a maximum timestamp when the queue should stop even if there are rows left in the queue.


Dieter



     
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