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Message Posted: Thu, 08 Mar 2001 @ 17:19:15 GMT


     
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Subj:   Re: Abort Session from BTEQ
 
From:   Geoffrey Rommel

I didn't ponder the details on this, but if you're running out of spool space even on small queries, it almost always means that the data is piling up on one AMP (vproc). The most frequent culprit seems to be redistributing the data by some column that contains a lot of NULLs; all the nulls, of course, are distributed to the same AMP (usu. the last one). But it could be some other value (perhaps during the product join of Product & Offers).

I suggest that you run the query again and have someone else query DBC.DiskSpace (?) as it is running. This view contains a column, CurrentSpool, that tells how much spool space is being used on each AMP for the user who is running the query. This will tell you which AMP is filling up, and that should give you a clue where the problem lies. For instance, if the user running the query is HENRY8, run this as often as possible while they're running:

/* WARNING: UNTESTED SQL */
select Vproc, CurrentSpool
from DBC.DiskSpace
where DatabaseName = 'HENRY8'
order by 2 desc;



     
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