Scratch that. As Vlad pointed out, you need to have buffering set to 3. I always reverse those :).

>>On one of my views I need an index but the index keeps vanishing after I have created it.
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>>It is a small view. I create the view then create the index with
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>>INDEX on seq TAG seq
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>>This works with no error messages but no index results afterwards.
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>>SET ORDER TO TAG SEQ produces no error message.
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>>the ORDER() command returns an empty string
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>>Using SET to check the data environment does indeed show there is no index on the view.
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>>Is a disk presence required before I can create an index? because I notice that the view only appears in memory and not on disk. This might be my problem.
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>>If so how do I force a disk presence since it does not appear in the view designer.
>
>You have to set the buffering mode of the view to optimistic buffering with:
>
>CURSORSETPROP("BUFFERING", "view_name", 5)
>
>Then you can create your index. Also, the index only lasts until the view is closed. Next time, you have to recreate it.