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Internal c-treeACE buffers are maintained to optimize indexes that do not match the partition index. For a partitioned file, calling FRSRNG/NXTRNG with a range that matches all key values on a key that has no relationship to the partition key was faster than using FRSREC/NXTREC on that same index. The range functions are taking advantage of the optimization that maintains key buffers for indexes that do not match the partition index. This optimization has now been enabled for NXTREC operations on a non-partition index.
