About 'skip_unusable_index' parameter in export

Hi All,
Any of you, please explain me what's the meaning of parameter 'skip_unusable_index'? what it will do? can any of you show me some practical steps regarding index.?
what should be the result if importing from one schema to another a dumpfile containing table and its corresponding index associated with, if the index was in 'UNUSABLE' status., using skip_unusable_index parameter ?
Even after executing , 'alter index index_name unusable', in source schema,in the view 'all_objects' the status column displaying 'valid'., why is it not displaying 'unusable' status?

Data Pump Import

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Message was edited by:
user577805

Hello,
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Andy wrote:
>
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About 'skip_unusable_index' parameter in export

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