[Xapian-discuss] How to update DB concurrently?

[oscaruser at programmer.net]

Reading omega/docs/omegascript.txt
Thanks...

> ----- Original Message -----
> From: oscaruser at programmer.net
> To: "Olly Betts" <olly at survex.com>
> Subject: Re: [Xapian-discuss] How to update DB concurrently?
> Date: Fri, 19 May 2006 11:19:26 -0800
> 
> 
> Olly,
> 
> Super, this worked perfectly. I want to change the appearance of 
> the search results by adding my own data. To make this work I want 
> to generate an XML stream with just URLs as the output of 
> omega.cgi. How can I do this?
> 
> Thanks
> 
> 
> > ----- Original Message -----
> > From: "Olly Betts" <olly at survex.com>
> > To: oscaruser at programmer.net
> > Subject: Re: [Xapian-discuss] How to update DB concurrently?
> > Date: Fri, 19 May 2006 04:17:53 +0100
> >
> >
> > On Thu, May 18, 2006 at 04:39:36PM -0800, oscaruser at programmer.net wrote:
> > > <       for (int index = 0; index < 150; index++) {
> > > <       std::ostringstream s;
> > > <       s << "/svr/hda1/omega/data/mydb" << std::setfill('0') 
> > << > std::setw(4) << index
> > > <         << "/default";
> > > <       //cout << s.str() << endl;
> > > <       db.add_database(Xapian::Database(s.str()));
> > > <       }
> >
> > There's no context, so I can't see where you're patching that, but it
> > looks plausible.
> >
> > However, I don't think you want to search 150 databases at once like
> > this.  The overhead from opening that many databases on every search is
> > likely to be noticable, and searching one big database will be more
> > efficient.
> >
> > Instead use xapian-compact to merge them all together like so:
> >
> > xapian-compact -F -m /svr/hda1/omega/data/mydb*/default /path/to/output/db
> >
> > And then search the merged database '/path/to/output/db'.
> >
> > You almost certainly want to use -m if you can - it merges in multiple
> > passes which for 150 databases should be substantially quicker.  It's
> > probably worth using -F too unless you want to update the merged
> > database by opening it as a WritableDatabase.
> >
> > Cheers,
> >      Olly


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