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  3. July 2014

Re: Fastest way to get item count

On 04-Jul-2014 14:54 -0500, Raul A Jager W wrote:
Birgitta Hauser on Friday, July 04, 2014 9:47 AM wrote:

Try to create an Encoded Vector Index with an INCLUDE clause:

CREATE ENCODED VECTOR INDEX YourSchema.YourEVI
ON YourSchema/YourFile (Delivery)
INCLUDE(Count(ItemNo), Count(Distinct ItemNo)) ;

<<SNIP>>

I believed that "count" was included by default in EVI indexes


Effectively, your understanding is correct. The COUNT is included\tracked for the column over which the EVI is created. In that example however, the column DELIVERY would "by default" have tracking for the COUNT.

Look closer at the EVI definition however, at the INCLUDE clause specifications. The COUNT aggregates that are being added, are for a different column [the column name ITEMNO] than the column on which the EVI is being created [the column name DELIVERY].


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