SEM_MATCH queries performance problems
HelloWe run into performance problems when you use queries SEM_MATCH.
We have a model for data (ABox) containing a triple 12 000 000.
We have a model for the plan (TBox) containing 800 triple.
We ran an implication of "OWLprime" and built the model and entailment index with the SEM_APIS commands.
The number of triplets after the execution of entailment was 35.000.000 triples.
We use the following hardware configuration:
OS: Windows Server 2008
CPU: Intel CPU Xeon X 5460 @3.15 GHz (2 CPUs).
64-bit operating system.
Memory: 32 GB
The results below, it seems that whenever we execute a query against the index of inference, execution time increases significantly.
Here are the results:
1. single template query using index of inference:
SELECT
x
TABLE)
SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >)',)
SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
SDO_RDF_RULEBASES ('OWLPrime'), NULL, NULL, NULL)
+);+
Execution time: 0.02 seconds
2.
a.Double query model using index of inference:
SELECT
x, y
TABLE)
SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
+(?x RDF:type <http://www.We.com/WEO.Owl#patient>) +.
+ (? x < http://www.we.com/weo.owl#id >? y)', +.
SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
SDO_RDF_RULEBASES ('OWLPrime'), NULL, NULL, NULL)
+);+
Run time: 127 seconds
b. double model query without indication of inference:
SELECT
x, y
TABLE)
SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
+(?x RDF:type <http://www.We.com/WEO.Owl#patient>) +.
+ (? x < http://www.we.com/weo.owl#id >? y)', +.
SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
NULL, NULL, NULL, NULL)
+);+
Execution time: 2.5 seconds
3.
a. triple query model using index of inference:
SELECT
x, y, z
TABLE)
SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
(? x rdf:type < http://www.we.com/weo.owl#patient >)
(? x < http://www.we.com/weo.owl#id >? y)
(? x < http://www.we.com/weo.owl#gender >? z)',
SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
SDO_RDF_RULEBASES ('OWLPrime'), NULL, NULL, NULL)
);
Running time: 146 seconds
b. triple query model without using the index of inference:
SELECT
x, y, z
TABLE)
SEM_MATCH (' (? x < http://www.we.com/weo.owl#has_symptom > < http://www.we.com/weo.owl #allergyA >))
(? x rdf:type < http://www.we.com/weo.owl#patient >)
(? x < http://www.we.com/weo.owl#id >? y)
(? x < http://www.we.com/weo.owl#gender >? z)',
SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
NULL, NULL, NULL, NULL)
);
Execution time: 9 seconds
Thank you
Doron
If you use 11.1.0.7.0 and you have installed the 7600122 hotfix, please use:
-Brace for the SEM_MATCH query syntax
-Virtual model (using SEM_Models ('TOM_ONTOLOGY', 'TOM_ONTOLOGY_TA'),
SDO_RDF_RULEBASES ('OWLPrime'))
-ALLOW_DUP = T (as part of the parameter options of SEM_MATCH)
For more details, please see
http://download.Oracle.com/docs/CD/B28359_01/AppDev.111/b28397/sdo_rdf_newfeat.htm
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How to investigate DB performance problems?
You can refer to the oracle support doc: Doc ID 1362329.1
In case you have difficulties to access the Oracle support, I copied some of these inline content:
K.
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Hello
I have a performance problem involving high line response to locking conflicts that I can't wait.
The application updates the specific table about 1200 times for my AWR report representing 2 hours.
This update represents 98% of the db_time and wait to enq: TX - line lock conflict is:
-83 796 waiting
-245 441 seconds
The application updates a row both an unprecedented SELECT UPDATES. This is the query:
Update my_table set creationtime =: 1, modificationdate =: version 2, =: creationuserid 3, =: fortesting 4, =: 5, modificationuserid =: participation_uuid 6, =: actimenucontact 7, =: allegroid 8, =: campaign_uuid 9, =: desjardinsemployeetype 10, =: effectiveparticipationtype 11, =: family_uuid 12, =: fetchpasseport 13, =: 14, healthratingfilldate =: hoursofsleeptimecommitment 15, =: igaid 16, =: initialsubscriptiontype 17, =: minutesofsleeptimecommitment 18, =: goal 19, =: partner_uuid 20, =: 21, promotionalemails =: 22, readrules =: sccsubscriptionprovenance 23, =: = subscriptionprovenance 24,: 25, supportemails =: where the 26 uuid = : 27 and = version: 28
Clause where is filtering on uuid which is the primary key of my_table.
The uuid is a specific user and two users would not update the same row, what could be the reason for this wait event?
Thank you
Why guess when you know.
Watch ASH data for these events to the queue.
He'll tell you sql id as well.
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took vcap5-dca exam today and had laboratory performance problems
Most of the time, the review ran ok. I was very impressed by the performance of the lab environment. I can say that I had to skip two questions I knew because the keyboard and mouse of entry would not work. After spending 5 minutes trying to get my keyboard and mouse works on one of the questions, I had to jump even if I knew the answer. It is unfortunate that, for a review of 400 dollar, you have performance problems that limit your ability to perform the review. Overall, I think I did pretty well. I was able to get about 19 questions answered to jump through the other 7 due to the performance and time. I acknowledge that the pace I started to was a bit slow, but laboratory performance degrade my ability to perform my best on this review. I would recommend to anyone who takes this review to make sure that you use a good test center. I drove 60 miles to my test center to make sure that I went to a good and always fell on issues. I could only imagine what it would have been like if I went to one of these centers of samples of groceries with a metropolitan WAN connection for internet :-) Now wait to see if I've spent 15 days.
Has anyone else had this kind of questions? If so, where did you register a complaint?
Hello
The delay is a common thing for everyone outside the USA. She varies the amount of delay but it has been around since the VCAP-DCA 4. In regard to complaints they should normally be done the day of the test to the exam administrator otherwise pearson cannot do much.
Good luck for the result!
Gregg
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