Observing poor performance on the execution of the quereis

Question

I am executing a relatively simple query which is rougly taking about 48-50 seconds to execute. Can someone suggest an alternate way to query the semantic model where we can achieve response time of a second or under. Here is the query
PREFIX bp:<http://www.biopax.org/release/biopax-level3.owl#>
PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
PREFIX ORACLE_SEM_FS_NS:<http://oracle.com/semtech#dop=24,RESULT_CACHE,leading(t0,t1,t2)>
SELECT distinct ?entityId ?predicate ?object
WHERE
?entityId rdf:type bp:Gene .
?entityId bp:name ?x .
?entityId bp:displayName ?y .
?entityId ?predicate ?object .
FILTER(regex(?x, "GB035698", "i")||regex(?y, "GB035698", "i"))
Same query executed from sqldeveloper takes about as long as well
SELECT distinct /*+ parallel(24) */subject,p,o
FROM TABLE
(sem_match ( '{?subject rdf:type bp:Gene .
?subject bp:name ?x .
?subject bp:displayName ?y .
?subject ?p ?o
filter (regex(?x, "GB035698", "i")||regex(?y, "GB035698", "i") )
sem_models ('biopek'),
null,
sem_aliases
( sem_alias
('bp',
'http://www.biopax.org/release/biopax-level3.owl#'
NULL,
null,null ))
Is there anything I am missing, can we do anything to optimize our data retrieval?
Best Regards,
Ami

Answer 1

For better performance when using FILTER involving regular expression, you may want to create a full-text index on MDSYS.RDF_VALUE$ table as described in:
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e11828/sdo_rdf_concepts.htm#CIHJCHBJ
I am assuming that you are checking for case-insensitive occurrence of the string GB035698 in ?x or ?y. (On the other hand if you are checking if ?x or ?y is equal to a case-insensitive form of the string GB035698, then the filter could be written in an expanded form involving just value-equality checks and would not need a full-text index for performance.)
Thanks.