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(C) IBM Corp. 1996, 1999

Text Extender: Administration and Programming


Chapter 2. Planning a text index

Before you begin the steps described in Chapter 4, Administration, you must decide whether to create a common text index, or to create individual indexes, one for each text column. This chapter helps you to make this decision, and to calculate approximately how much disk space you will need for text indexes.

There are several types of index to choose from: linguistic, precise, dual, and Ngram. The choice of index type is significant. For example, if you choose linguistic as the index type, you can search for word variations and synonyms of the search term. The index type also affects indexing performance and the size of the index. You can also make use of the search capabilities of more than one index type by creating several indexes, each having a different index type, per text column.


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