We need that information to determine initial and next extent sizes for partitions in bytes, since Oracle only gives it in blocks. If you uncheck "Partitions" in the comparison, then you won't see the message. Of course, in that case, if we have to create any missing tables in the target schema, they will be non-partitioned, even if partitioned in the source schema. I could make an enhancement to not try to find block size if you uncheck just initial/next in the storage options, since you may not be using those params (they aren't so important these days anyway), but I don't like the idea of letting the comparison proceed if it can't give you everything that you asked for.
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