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I am not sure what you referred to by "parameter for Oracle Semantics".
Here is a link to the quick start on Oracle Semantics from the Oracle Documentation
1.10 Quick Start for Using Semantic Data
Hope this helps, let me know if you have further questions
Thanks for the URL.
I need to improve Semantics Performance, Which parameters can be added to the init.ora file.
1. There are no init ora parameters specific to Oracle Semantics
You may want to review your memory parameters
2. And gathers statistics about RDF and OWL tables and their indexes.
conn / as sysdba
SQL> sem_perf.gather_stats(false, 4);
3. Review the SEM_MATCH chapter for the use of hints
1.6 Using the SEM_MATCH Table Function to Query Semantic Data
If you have a specific query with performance problems you can paste the query here