Release 8.1.5
A67845-01
 Library |
 Product |
 Contents |
 Index |
| Oracle8i interMedia Text Migration Release 8.1.5 A67845-01 |
|
This chapter provides an overview of the new features, enhancements, and changes to Oracle8i interMedia Text, version 8.1.5, the product formerly know as ConText.
The following topics are covered in this chapter:
The following terms are used throughout this manual:
The product formerly known as Oracle ConText Cartridge. Oracle8i interMedia Text might also be abbreviated as iMT.
Oracle Context Cartridge, version 2.X.
This term refers to moving from a ConText pre-8.1.5 application to an interMedia Text 8.1.5 application.
Old features are referred as features of ConText pre-8.1.5 or ConText 2.X. New features are referred to as features of interMedia Text 8.1.5.
|
See Also:
For more information on the migration process, see Chapter 2, "Migrating Your Application". |
Domain index of type context.
A SELECT statement that uses the CONTAINS operator to query a Text index.
A Text query that matches an exact word or phrase.
A Text query that uses the ABOUT operator to search for concepts. This type of query was formerly referred to as a theme query.
This section briefly describes the new features of interMedia Text 8.1.
The interMedia Text 8.1.5 index is created as an extensible (domain) index to Oracle. As a result, you create the Text index and issue Text queries using standard SQL.
Other benefits of integration include:
For more information about renaming indexes and using the extensible optimizer, see Oracle8i interMedia Text Reference.
See Also:
A new out-of-box default system enables you to create a Text index immediately without explicitly creating and setting your own custom preferences for indexing.
For example at install time, interMedia Text establishes default indexing options, automatically setting language-specific preferences such as lexer and stoplist to the language you specify in your database setup. Oracle also detects your text column format and automatically filters the formatted text contained in these columns.
Oracle8i interMedia text uses the Inso Corporation's filtering technology, which enables the system to automatically detect and filter most document formats. With this single filtering technology, the system can index single or mixed format columns.
You can also set up the system to use your own user filter.
The INSO filtering technology is also used to create plain-text and HTML output for document presentation.
|
See Also:
For more information about supported document formats, filtering, and document presentation, see Oracle8i interMedia Text Reference. |
You can add custom concepts, categories, words or phrases to the knowledge base to improve theme capabilities. You do this by creating the extension as a thesaurus. You import the thesaurus with ctxload and then compile the thesaurus with ctxkbtc to augment the existing knowledge base.
|
See Also:
For information about the thesaurus loader, ctxload and the knowledge base compiler, ctxkbtc, see Oracle8i interMedia Text Reference |
Given a query expression, you can obtain related query term information (broader term, narrower term, related term). Your application can present this information to users to help them refine their queries.
.
|
See Also:
For more information about the CTX_DOC.HFEEDBACK procedure, see Oracle8i interMedia Text Reference |
An additional datastore method, USER_DATASTORE, has been added. This data storage method enables you to define a procedure that synthesizes documents during indexing. Such virtual documents exist only during indexing, but content and structure are preserved in the index.
For example, a user-defined procedure might synthesize the date, author, and text columns into one document to have author and date information be indexed as part of a single document.
In addition to defining stopwords, you can define stopthemes and stopclasses, which can be added to a stoplist.
Stopthemes are themes that are not to be indexed. Stopclasses define classes of alphanumeric characters that are not to be indexed, such as numbers.
|
See Also:
For more information about the adding stopthemes and stopclasses, see the CTX_DDL package in the Oracle8i interMedia Text Reference |
You can add stopwords, stopthemes, and stopclasses to a stoplist after the index has been created.
Field sections are new for 8.1.5. These are sections that are indexed as sub-documents. They have some performance advantages over zone sections.
|
See Also:
For more information about document field sections, see the CTX_DDL.ADD_FIELD_SECTION procedure in Oracle8i interMedia Text Reference |
The new section group object XML_SECTION_GROUP supports for defining sections in XML-style tagged documents.
The new section group object NEWS_SECTION_GROUP supports defining sections in news group formatted documents according to the RFC 1036 specification.
|
See Also:
For more information about defining sections in XML and news group formatted documents, see Oracle8i interMedia Text Reference |
In German, Danish, and Swedish, interMedia Text recognizes the accepted alternate spellings of query terms. You enable alternate spelling with BASIC_LEXER.
Because the Text index is now an Oracle domain index, most features such as indexing, querying, and document presentation have changed in iMT 8.1.5. How to migrate these features are discussed throughout this manual.
The following table lists the topics that are covered and where in this manual to look for more information:
| Topic | Where to Find More Migration Information |
|---|---|
|
Planning Your Migration |
|
|
Administration |
|
|
Index Tables and Objects |
|
|
Index Creation and Management |
|
|
Querying |
|
|
Document Presentation |
The CONTAINS and SCORE operators remain unchanged for 8.1.
|
See Also:
For more information about migrating Text queries, see Chapter 6, "Querying". For the syntax of these operators, see Oracle8i interMedia Text Reference |
You use following standard SQL commands to create and manage the 8.1.5 Text index, which is a domain index of type context:
For more information about migrating Text indexes with CREATE INDEX and ALTER INDEX, see Chapter 5, "Indexing".
For syntax information, refer to the Oracle8i interMedia Text Reference.
.
See Also:
Most of the operators available in pre-8.1.5 are available in 8.1.5. However, some are obsolete and have changed.
The following table list the operators that are obsolete in 8.1.5. The column entitled "How to Migrate" tells you how to migrate and where to look for more information:
| Operator | Equivalent | Status | How to Migrate |
|---|---|---|---|
|
EXECUTE |
@ |
Obsolete |
Call the function in SELECT statement. See "PL/SQL Operator" in Chapter 6. |
|
First/Next |
# |
Obsolete |
|
|
Max |
: |
Obsolete |
The following operator has changed in 8.1.5
| Operator | Equivalent | Status | Migration Notes |
|---|---|---|---|
|
ACCUMulate |
, |
Changed |
Oracle 8i interMedia Text 8.1.5 provides the following new operators:
For more information on the ABOUT operator, see "Theme Query (English Only)" in Chapter 6.
For complete syntax information about these and existing operators, see Oracle8i interMedia Text Reference
See Also:
Most index preference objects and system-defined preferences have changed in 8.1.5.
The following index objects have been added:
For more information about new and existing objects, see the Oracle8i interMedia Text Reference.
See Also:
Most PL/SQL packages and procedures have changed.
Oracle8i interMedia Text 8.1.5 has new packages and procedures.
|
See Also:
For a complete list of the interMedia Text 8.1.5 packages and procedures, refer to the Oracle8i interMedia Text Reference. |
The following executables have changed for 8.1.5:
This executable has undergone the following changes:
This loader retains all its pre-8.1.5 functionality. It has added support of export/updating BLOB and CLOB columns.
|
See Also:
To learn more about the ctxsrv and ctxload command syntax, see the Oracle8i interMedia Text Reference. |
This shell script that monitors and shuts down ctxsrv is obsolete.
The following executable is new for 8.1:
This executable compiles an extended knowledge base from one or more thesauri (up to 16).
|
See Also:
To learn more about the ctxkbtc command syntax, see the Oracle8i interMedia Text Reference. |
Most views from ConText 2.X have been renamed. New views have also been added to the 8.1.5 release.
|
See Also:
For a complete list all the views in the 8.1.5 release, see the Oracle8i interMedia Text Reference. |
