Best preferences for queries to prefix with the index catalog (CTXCAT)

Documentation for Oracle Text gives this example of a setting preferred prefix/substring for the index catalog and context:

Start
ctx_ddl.create_preference ('mywordlist', 'BASIC_WORDLIST');
ctx_ddl.set_attribute ('mywordlist', 'PREFIX_INDEX', 'TRUE');
ctx_ddl.set_attribute ('mywordlist', 'PREFIX_MIN_LENGTH', ' 3');
ctx_ddl.set_attribute ('mywordlist', 'PREFIX_MAX_LENGTH', ' 4');
ctx_ddl.set_attribute ('mywordlist', 'SUBSTRING_INDEX', 'YES');
end;

The SUBSTRING_INDEX attribute is really necessary if I only ever issue that research prefix, such as:

Auction title SELECT FROM WHERE CATSEARCH (title, ' cam *', ") > 0;

I'm not sure that you understand the difference between the PREFIX_INDEX and the SUBSTRING_INDEX.

Substring is intended to speed up searches "double truncation", especially for the requirements specialist such as the research of the chemical name, where you want to search "% fluoro" or similar.

It is NOT recommended for general use, because it significantly slows down indexing and makes the very much larger indices.

Prefix allows you to speed up the search for right truncated simple searches such as '% of cam', but it's not normally necessary.

For general use with middle office truncation and right (for example "oracl %" or "% key ora") I would not use one of these options. Double truncation or truncation on the left ("% racl %" or "% scrapes") should be avoided as far as possible - use of the wildcard character to start without the option of substring will cause a full table scan on the index table $I to find all words that match, given that the index can not be used with a wildcard to start.

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