A Metamorph counter index contains the same information that a compact Metamorph index has, but also includes additional information which improves the performance of LIKEIN queries. If you are doing LIKEIN queries then you should create this type of index, otherwise you should use either the normal or inverted forms of the Metamorph index. A Metamorph counter index is created with CREATE METAMORPH COUNTER INDEX; in Texis version 7 and later the COUNTS 'on' index option (here) can be given instead of the COUNTER flag to accomplish the same action.

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