>Hi All!
>
>I have this problem wherein in our client sites, some tables (dbfs), specially the ones that are always being used, its corresponding index files' indexes are being erased. As in whenever we would replace it with a new index file, after a week or so, some of its indexes (in the index file) are again erased or deleted. What causes this problem?

I've never heard of specific indexes being removed from an index file. Are you sure that other index files are not being copied over the existing ones, or that there is not some sort of routine that runs to index the files that has not been updated? This just does not make sense.