What about using a naturally-increasing number for quality?
For example the number of weeks since 1970:
xs:integer(
(current-date() - xs:date('1970-01-01'))
div xs:dayTimeDuration("P7D"))
=> 531
You can reduce the magnitude of the quality boost by increasing the bucket
size: 14D, 30D, etc. Or changing the start-date might also be useful.
No crawl is necessary, unless you change your mind about the boost algorithm.
-- Mike
On 20 Aug 2013, at 11:10 , Ron Hitchens <[email protected]> wrote:
>
> What are the techniques out there for giving newer documents
> higher relevance? My target is MarkLogic 5.x, but 6.x may be in
> play before long.
>
> There are two schemes that I am aware of, neither of which feels
> very elegant:
>
> 1) Give documents a high quality value when ingested. Periodically
> crawl the content and for any document with positive quality, reduce
> its quality according to some algorithm until the quality reaches zero.
>
> This gives the best control over "freshness", but has the disadvantage
> of causing potentially large numbers of updates on each pass with the
> attendant merges and disk I/O & CPU load.
>
> 2) Replicate the "real" query n times, each and-ed with a time-based
> query against the insertion date. All of these are or-ed together
> with descending weights for older dates.
>
> This does't require changing documents to tweak their freshness. But
> it also means you have a stair-step function of n-steps, which may not
> be very precise - and which wouldn't scale very well for large values
> of n. And unfortunately, since the queries would be time-based, you
> can't pre-register them ahead of time.
>
> Any other clever techniques that you've used?
>
> ---
> Ron Hitchens {[email protected]} +44 7879 358212
>
>
>
>
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