You should also BIND your program with the REOPT(VARS) parameter to allow DB2 to use an index on this predicate....
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As long as at least one leading character is supplied DB2 can use an index. If, however, the leading character is unknown - that is, it is a percent sign (%) or underscore (_) - then DB2 would use an expensive table space scan. If you do not specify REOPT(VARS), then DB2 will not know what the variable contains and will likely resort to the scan for the query at BIND time. Of course, you could also use dynamic SQL to resolve this problem.
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