When should you use full-text indexing?

It will depend upon your DBMS. I believe that most systems will not take advantage of the full-text index unless you use the full-text functions. (e.g. MATCH/AGAINST in mySQL or FREETEXT/CONTAINS in MS SQL)

Here is two good articles on when, why, and how to use full-text indexing in SQL Server:

  1. How To Use SQL Server Full-Text Searching
  2. Solving Complex SQL Problems with Full-Text Indexing

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