Hi,
it looks that something got corrupted in the process. This is starting
to be very usual with windows installations. Anyway, you should delete
the contents of the dbfarm directory in the monetdb installation
directory. This will *delete* all data in your database (i guess you
dont have any important data still in cause you are testing). After
you delete dbfarm, start mserver, that will populate again dbfarm with
the default files. then, add again your data with the usual
pf:add-doc, then create the tijah indices and then run your queries:)
If this does not work, we will have to try to "wake up" the pf/tijah
people to help us.
Hope this will help,
lefteris
On Tue, Jul 21, 2009 at 10:35 AM, Roy Walter<garliestonhouse@yahoo.co.uk> wrote:
OK, I restarted and got an error message that pointed to a problem document
in a collection. I deleted the offending document and then tried to generate
the default index with tijah:create-ft-index(). This failed because,
apparently, the DFLT_FT_INDEX already exists.
So I thought that even though the index compilation appeared to have failed
at the earlier error an index must have been created.
I tried a tijah:query(). That failed because the DFLT_FT_INDEX does not
exist.
Hmm, so I tried tijah:delete-ft-index() and it too told me that
DFLT_FT_INDEX does not exist.
tijah:create-ft-index() still fails with: !ERROR tj_init_collection, pftijah
collection already exists: DFLT_FT_INDEX
How do I reset?
-- Roy
Lefteris wrote:
This is not expected.
Did you try to restart the server and retry?
You might also have a corrupted dbfarm or the documents didn't shred
correctly to begin with. Which version of monet are you using? how did
you installed it?
lefteris
On Mon, Jul 20, 2009 at 8:52 PM, Roy Walter<garliestonhouse@yahoo.co.uk>
wrote:
Hi lefteris
Well that seems to tick all the boxes.
I tried the global index creation:
tijah:create-ft-index()
and it crashed the server with:
!WARNING: readClient: unexpected end of file; discarding partial input
Hmm...
R.
Lefteris wrote:
Hi Roy,
I suggest that you try the pf/tijah module for MonetDB/XQuery.
http://dbappl.cs.utwente.nl/pftijah/
This will create specific indices for your queries to facilitate text
search.
Hope this helps for now. We will also investigate were the time is
spent in your case (without pf/tijah) and come back to you. How many p
elements your documents have? The problem might be that because monet
does not build inverted indices on text by itself, it has to visit
each p element and search with the help of the pcre library. Pf/tijah
was build for that purpose and should help alot.
Please feel free to contact us for further clarification and new
findings from your tests:)
cheers,
lefteris
On Mon, Jul 20, 2009 at 6:28 PM, Roy Walter<garliestonhouse@yahoo.co.uk>
wrote:
Running MonetDB/XQuery on a 2.6GHz 32-bit Windows XP box with 1GB of RAM.
What is the best way to organise XML in MonetDB for rapid text searching?
A
run down of my recent experience might help.
I created a collection of around 450 documents (153MB approx.). I ran the
following query from the command line:
collection("papers")//p[contains(., 'wind farm')]
The query time is at best 19 seconds. That's bad. (It's worse than
querying
a Postgres database with documents stored in the XML field type.)
So to get a reference point I loaded up the 114MB XMark document and ran
this query:
doc("standard")//text[contains(., "yoke")]
The query time varies from 2 to 4 seconds. Better, but still not great.
Now, adding more RAM (and moving to 64-bit) would speed things up I hope!
But hardware aside:
1. Is it better to have big documents rather than big collections?
2. Is having small collections (<10 docs) of big documents also
inefficient?
Ideally I need to query collections comprising several thousand documents
using 'text search' predicates. Are there other, better ways to run this
type of query against a MonetDB XML database? Or should I really be using
some other platform for this task?
Thanks in advance for any pointers.
-- Roy
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