Daniel Noll wrote:

Ah. I was making the assumption that the indexes were implemented "properly." For instance, an index should keep a certain amount in memory in order to have a reasonable chance of running quickly. So the max and min should already be in-memory.

I take it that Derby doesn't do this?


The column doesn't necessarily have to have an index or even be unique. An insert will only fail when there's a unique constraint on the column and the sequence generator returns a value that's already been used.

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