segment fragmentation

I have been asked to determine segment/object fragmentation levels after a mass delete has been performed.

Do LMT only negate fragmentation occuring at a tablespace level as an issue and segment fragmentation and high water mark issues are still relevant after a mass purge?

How does one check for this type of fragmentation?

It has been requested I perform an export/import of said schema after verifying segment fragmentation exists.

By the way, I have finally purchased Optimizing Oracle Performance and have begun the reading.

Regards,

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..
David

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