[rules-users] Poor performance from a simple join

[Mauricio Salatino]

It looks like you have a lot of objects that are not matching with
that guard  (device_type_desc != null) that means that the number of
activations are less than 10k x 10k and can be processes quickly.



2011/12/19 Mark Proctor <mproctor at codehaus.org>:
> Nested accessors are not currently indexed, because we cannot assure their
> immutability:
> $call.device_type
>
> If people changed indexed nested accessors, without correctly notifying the
> engine it would result in integrity problems.
>
> If you have a large number of these, trying flattening the model, such as
> you would do in a database.
>
> Mark
> On 19/12/2011 16:23, David Martin wrote:
>
> Folks:
>
> My co-workers and I have been using Drools to great success, but we ran
> smack into a performance brick wall recently.
>
> In the example below, both BINNING_INPUT and LU_DEVICE_TYPE have large
> numbers of associated facts in working memory (BINNING_INPUT has more than 8
> million facts in working memory, LU_DEVICE_TYPE about 10k.)
>
> LU_DEVICE_TYPE models a lookup table.
>
> rule "Binning for Attribute: Device_type_desc"
>   when
>     $call :
>       BINNING_INPUT()
>     $device_typeLookup :
>       LU_DEVICE_TYPE(
>         $call.device_type == device_type
>       )
>
>   then
>     $call.setDevice_type_desc($device_typeLookup.getDevice_type_desc());
> end
>
> It's a simple enough rule: join on the device_type field.  Unfortunately,
> this rule and a few others like it are taking FOREVER to insert.  Even when
> I cut the number of BINNING_INPUT facts in working memory down from 8M to
> 10k.
>
> This feels like a basic Drools question.  But I can't seem to find any help
> from google.
>
> Please advise!
>
> Thanks in advance,
>
> Dave Martin
>
>
>
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