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In the index display in Figure 22, Oracle will apply predicates to the index columns
starting from the top column of an index.
With the predicates in the statement, MANDT is the only matching column in these indexes,
since USNAM and ERFNAM, which are adjacent to MANDT, are not in the local predicates.
Thus RBSTAT, which is the third column in the RBKP~3 and RBKP~4 indexes, cannot be processed
as matching column – Oracle would match MANDT, and then scan the index to check RBSTAT values.
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