index node split autonomy

Many of the concurrency/consistency concepts are demonstrated in the Oracle docs with simple examples on tables, where the process has to reach into the undo to obtain a read-consistent view. I think I more or less understand this. But I'm curious about the analogous operations on indices. If indices never split blocks, it seems they could operate in pretty much the same way as tables. But then they wouldn't be much good as indices, either.

If an DML statement causes a index block to split, and then that statement rolls back, is the split also rolled back, or does it persist?

Xho

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