Knowledge Base Extension Compiler (ctxkbtc)

The knowledge base is the information source that Oracle Text uses to perform theme analysis, such as theme indexing, processing ABOUT queries, and to document theme extraction with the CTX_DOC package. A knowledge base is supplied for English and French and is installed by default.

With the ctxkbtc compiler, you can:

• Extend your knowledge base by compiling one or more thesauri with the Oracle Text knowledge base. The extended information can be application-specific terms and relationships. During theme analysis, the extended portion of the knowledge base overrides any terms and relationships in the knowledge base where there is overlap.

• Create a new user-defined knowledge base by compiling one or more thesauri. In languages other than English and French, this feature can be used to create a language-specific knowledge base.

  Note: Only CTXSYS can extend the knowledge base.

  This section contains the following topics.

  • Knowledge Base Character Set

  • ctxkbtc Syntax

  • ctxkbtc Usage Notes

  • ctxkbtc Limitations

  • ctxkbtc Constraints on Thesaurus Terms

  • ctxkbtc Constraints on Thesaurus Relations

  • Extending the Knowledge Base

    Example for Extending the Knowledge Base

  • Adding a Language-Specific Knowledge Base

    Limitations for Adding a Knowledge Base

  • Order of Precedence for Multiple Thesauri

  • Size Limits for Extended Knowledge Base

See Also:

For more information about the ABOUT operator, see ABOUT operator in Oracle Text CONTAINS Query Operators

For more information about document services, see CTX_DOC Package