[Xapian-discuss] Merging databases

[头太晕]

2007/1/25, Olly Betts <olly at survex.com>:
>
> On 18/01/07, Felix Antonius Wilhelm Ostmann <ostmann at websuche.de> wrote:
> > What must i do when i want to merge databases with xapian-compact, but i
> > have the same document in every database and i only want one (the
> > newest) document in the merged database. the uniq-id is in one value,
> > the date in another. What is the best way?
>
> You'd have to write a custom merging program.  Probably the
> "copy-database" example is the best starting point (despite the name,
> it can also combine several databases).
>
> Note that xapian-compact is fast because it doesn't have to "invert
> the database" to create the mapping from a term to a list of
> documents.  If you're dealing with large databases, your merge will be
> much slower because you can't really do the same.
>
> The easiest solution might be to avoid getting into the situation
> where you need to do such merging if that's possible.
>
> Cheers,
>     Olly


 Enquire::set_collapse_key()  maybe do that.