By McGregor C.
Oracle textual content program Developer's consultant is meant for clients who practice the subsequent tasks:■ increase Oracle textual content applications.■ Administer Oracle textual content installations.To use this rfile, you want to have adventure with the Oracle item relational database administration method, SQL, SQL*Plus, and PL/SQL.
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Your document must be indexed before you can issue a CONTAINS query. Use the CONTAINS operator in a SELECT statement. With CONTAINS, you can issue two types of queries: ■ word query ■ ABOUT query You can also optimize queries for better response time to obtain the top n hits. The following sections give an overview of these query scenarios. Word Query Example A word query is a query on the exact word or phrase you enter between the single quotes in the CONTAINS or CATSEARCH operator. The following example finds all the documents in the text column that contain the word oracle.
For internal filtering, use the PROCEDURE_FILTER filter type. See Also: PROCEDURE_FILTER Example in this chapter. Bypassing Rows for Indexing You can bypass rows in your text table that are not to be indexed, such as rows that contain image data. To do so, create a format column in your table and set it to IGNORE. You name the format column in the parameter clause of CREATE INDEX. Document Character Set The indexing engine expects filtered text to be in the database character set. When you use the INSO_FILTER filter type, formatted documents are converted to text in the database character set.
By default, Oracle assumes the language of text to index is the language you specify in your database setup. You use the BASIC_LEXER preference type to index whitespace-delimited languages such as English, French, German, and Spanish. For some of these languages you can enable alternate spelling, composite word indexing, and base letter conversion. You can also index Japanese, Chinese, and Korean. See Also: Oracle Text Reference to learn more about indexing these languages. Indexing Multi-language Columns Oracle can index text columns that contain documents of different languages, such as a column that contains documents written in English, German, and Japanese.