You can use the
EXPLAIN statement to display the selected search strategy.List of All Possible Search Strategies
CATALOG KEY ACCESS CATALOG SCAN CATALOG SCAN USING USER EQUAL CONDITION DIFFERENT STRATEGIES FOR OR-TERMS EQUAL CONDITION FOR INDEX EQUAL CONDITION FOR INDEX (SUBQ) EQUAL CONDITION FOR KEY COLUMN EQUAL CONDITION FOR KEY COLUMN (SUBQ) IN CONDITION FOR INDEX IN CONDITION FOR KEY COLUMN JOIN VIA INDEXED COLUMN JOIN VIA KEY COLUMN JOIN VIA KEY RANGE JOIN VIA MULTIPLE INDEXED COLUMNS JOIN VIA MULTIPLE KEY COLUMNS JOIN VIA RANGE OF MULTIPLE INDEXED COL. JOIN VIA RANGE OF MULTIPLE KEY COLUMNS NO RESULT SET POSSIBLE NO STRATEGY NOW (ONLY AT EXECUTION TIME) RANGE CONDITION FOR KEY COLUMN RANGE CONDITION FOR KEY COLUMN (SUBQ) RANGE CONDITION FOR INDEX RANGE CONDITION FOR INDEX (SUBQ) INDEX SCAN TABLE SCAN