Multiple choice technology databases

I have a Sybase IQ table with about 1 million rows. To improve performance, I need to add an index on the primary key which has over 900 distinct values. Which index type would I choose?

  1. LF

  2. HG

  3. HNG

  4. CMP

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A Correct answer
Explanation

LF (Low Fast) index is optimized for columns with high cardinality like primary keys, providing efficient lookup performance. HG (High Group) is better for low-cardinality columns with many duplicates. HNG (High Non-Grouped) and CMP are not standard Sybase IQ index types for this use case.