> I need to learn whether there is a way to remove some records on indexed
> files.

Of course.  See IndexReader and IndexWriter deleteXXX methods.

> And is it rapid for removing some indexed file records

Of course.

> (For example clean old records whose created date's are less than a definite 
> day) .

If the created date is an indexed field you could do this with one of
the methods that takes a query - RangeQuery in your case from, say, 0
TO 20100101, dependent obviously on your data.  It the date field is
not indexed you could loop through all docs checking the date and
zapping the old ones by docNum



--
Ian.

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