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Senlin Liang wrote:
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cite="mid:5e9db1b50810151301g396c8013xac0796788d473593@mail.gmail.com"
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<pre wrap="">Thanks Mark!
I got another question: what kind of indexing is used in drools? what
field does it index?
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It wil index the field used in the constraint<br>
Person( name == "mark" )<br>
Person( name == $var )<br>
<br>
Both of those pattners will be indexed no the name field, the first is
what we call alpha node hashing, as it's on a literal and the latter is
join node index on the name field.<br>
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cite="mid:5e9db1b50810151301g396c8013xac0796788d473593@mail.gmail.com"
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I checked the online manual, it seems that I uses hashing index, but i
am not sure the details.
The reason that I am asking this question is that: drools runs really
faster for one of my program. In this program, there is information
about DBLP publications:
a(primary key, property, values), where primary key is the primary
key of one publication, property can be one of "author, year, ...",
and value is the value of the property. I run the query by joining the
tables together using the primary key. Drools runs really fast for
this program.
I am wondering whether there is anything behind to make drools fast.
Senlin
On Wed, Oct 15, 2008 at 3:41 PM, Mark Proctor <a class="moz-txt-link-rfc2396E" href="mailto:mproctor@codehaus.org"><mproctor@codehaus.org></a> wrote:
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<pre wrap="">Senlin Liang wrote:
One more question: does drools index intermediate results (such as the
inserted objects in actions)?
Any inserted object used in == constraints is indexed for that constraint.
Is there any cost-based optimization for queries?
no
Thanks
On Wed, Oct 15, 2008 at 9:10 AM, Senlin Liang <a class="moz-txt-link-rfc2396E" href="mailto:senlin.liang@gmail.com"><senlin.liang@gmail.com></a>
wrote:
Hi all,
I got one question: How does drools index the objects in memory? Does
it use hashing index, based on what? Or drools uses adaptive indexing?
Thanks a lot,
Senlin
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