Hi Erol,
I am filtering one big xml db that 800Mb stored into basex db already. When I write filtered data into a file, I am getting out of memory.
as the file:write() uses an iterative approach to serialize XQuery items, out of memory errors should only occur if the query itself causes huge intermediary results. Could you please send us the original query and tell us how you executed the query (GUI vs. standalone vs. client/server)?
All the best, Christian
I know basex is generating result filtered document in memory before writing and facing memory error.
Can basex write results block by block?
Thanks
On Wed, May 4, 2011 at 9:38 AM, Erol Akarsu eakarsu@gmail.com wrote:
I tried to delete some nodes with "delete nodes .." xquery update command. It actually did what was requested.
I checked the database size that is still same as previous one. I know the nodes deleted has a lot of data and I think database indexes would be adjusted accordingly.
Then, I exported database as xml file and recreated db. I can see it has real size.
My question is why DB is not adjusting indexes when nodes deleted?
Thanks
Erol Akarsu
On Fri, Apr 29, 2011 at 9:23 AM, Erol Akarsu eakarsu@gmail.com wrote:
Hi,
Have we thought on clustering basex servers so we can partition xml documents?
Here, I am only interested in a global partitioning:
Let's say if we have xml document like this, I would like to partition RECORDS content so that each host will have equal number of RECORD elements. Then, we need to aggregate results of individual hosts. Can we implement this simple clustering framework with Basex?
<RECORDS> <RECORD> ..... </RECORD> <RECORD> ..... </RECORD> </RECORDS>
On Mon, Apr 11, 2011 at 12:35 PM, Erol Akarsu eakarsu@gmail.com wrote:
Ok,
I was able to run full text search with another XML Database.
I am primarily interested in how Basex will play with big XML file Wikipedia.
Actually, Database create of wikipedia is fine. But when I add full tet search and indexes for it, it always throws out of memory exception error.
I have changed -Xmx with 6GB that is still not enough to generate indexes for Wikipedia.
Can you help me on how to generate indexes with a machine that case 6GB for Basex process?
Thanks
Erol Akarsu
On Sun, Apr 10, 2011 at 4:07 AM, Andreas Weiler andreas.weiler@uni-konstanz.de wrote:
Hi, the following query could work for you: declare namespace w="http://www.mediawiki.org/xml/export-0.5/"; for $i in doc("enwiki-latest-pages-articles")//w:sitename return $i[. contains text "Wikipedia"]/.. -- Andreas Am 09.04.2011 um 20:43 schrieb Erol Akarsu:
Hi
I am having difficulty in running full text operators. This script gives siteinfo below declare namespace w="http://www.mediawiki.org/xml/export-0.5/"; let $d := fn:doc ("enwiki-latest-pages-articles") return ($d//w:siteinfo)[1]
But return $d//w:siteinfo[w:sitename contains text 'Wikipedia'] does NOT give same node Why "contains" ft operator behave incorrectly? I remember it was working fine. I just dropped and recreated database and turn all indexes. Can you help me? Query info is here:
Query: declare namespace w="http://www.mediawiki.org/xml/export-0.5/"; Compiling:
- pre-evaluating fn:doc("enwiki-latest-pages-articles")
- adding text() step
- optimizing descendant-or-self step(s)
- removing path with no index results
- pre-evaluating (())[1]
- binding static variable $res
- pre-evaluating fn:doc("enwiki-latest-pages-articles")
- binding static variable $d
- adding text() step
- optimizing descendant-or-self step(s)
- removing path with no index results
- simplifying flwor expression
Result: () Timing: - Parsing: 0.46 ms - Compiling: 0.42 ms - Evaluating: 0.17 ms - Printing: 0.1 ms - Total Time: 1.15 ms Query plan:
<sequence size="0"/>
<siteinfo xmlns="http://www.mediawiki.org/xml/export-0.5/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <sitename>Wikipedia</sitename> <base>http://en.wikipedia.org/wiki/Main_Page</base> <generator>MediaWiki 1.17wmf1</generator> <case>first-letter</case> <namespaces> <namespace key="-2" case="first-letter">Media</namespace> <namespace key="-1" case="first-letter">Special</namespace> <namespace key="0" case="first-letter"/> <namespace key="1" case="first-letter">Talk</namespace> <namespace key="2" case="first-letter">User</namespace> <namespace key="3" case="first-letter">User talk</namespace> <namespace key="4" case="first-letter">Wikipedia</namespace> <namespace key="5" case="first-letter">Wikipedia talk</namespace> <namespace key="6" case="first-letter">File</namespace> <namespace key="7" case="first-letter">File talk</namespace> <namespace key="8" case="first-letter">MediaWiki</namespace> <namespace key="9" case="first-letter">MediaWiki talk</namespace> <namespace key="10" case="first-letter">Template</namespace> <namespace key="11" case="first-letter">Template talk</namespace> <namespace key="12" case="first-letter">Help</namespace> <namespace key="13" case="first-letter">Help talk</namespace> <namespace key="14" case="first-letter">Category</namespace> <namespace key="15" case="first-letter">Category talk</namespace> <namespace key="100" case="first-letter">Portal</namespace> <namespace key="101" case="first-letter">Portal talk</namespace> <namespace key="108" case="first-letter">Book</namespace> <namespace key="109" case="first-letter">Book talk</namespace> </namespaces>
</siteinfo>
On Mon, Apr 4, 2011 at 7:31 AM, Erol Akarsu eakarsu@gmail.com wrote:
I imported wikipedia xml into basex and tried to search it.
But searching it takes longer.
I tried to search one element that is first child of whole document and it took 52 sec. I know the XML file is very big 31GB. How can I optimize the search?
declare namespace w="http://www.mediawiki.org/xml/export-0.5/";
let $d := fn:doc ("enwiki-latest-pages-articles")//w:siteinfo return $d
Database info:
> open enwiki-latest-pages-articles Database 'enwiki-latest-pages-articles' opened in 778.49 ms. > info database Database Properties Name: enwiki-latest-pages-articles Size: 23356 MB Nodes: 228090153 Height: 6
Database Creation Path: /mnt/hgfs/C/tmp/enwiki-latest-pages-articles.xml Time Stamp: 03.04.2011 12:29:15 Input Size: 30025 MB Encoding: UTF-8 Documents: 1 Whitespace Chopping: ON Entity Parsing: OFF
Indexes Up-to-date: true Path Summary: ON Text Index: ON Attribute Index: ON Full-Text Index: OFF >
Timing info:
Query: declare namespace w="http://www.mediawiki.org/xml/export-0.5/"; Compiling:
- pre-evaluating fn:doc("enwiki-latest-pages-articles")
- optimizing descendant-or-self step(s)
- binding static variable $d
- removing variable $d
- simplifying flwor expression
Result: element siteinfo { ... } Timing: - Parsing: 1.4 ms - Compiling: 52599.0 ms - Evaluating: 0.28 ms - Printing: 0.62 ms - Total Time: 52601.32 ms Query plan:
<DBNode name="enwiki-latest-pages-articles" pre="5"/>
Result of query:
<siteinfo xmlns="http://www.mediawiki.org/xml/export-0.5/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <sitename>Wikipedia</sitename> <base>http://en.wikipedia.org/wiki/Main_Page</base> <generator>MediaWiki 1.17wmf1</generator> <case>first-letter</case> <namespaces> <namespace key="-2" case="first-letter">Media</namespace> <namespace key="-1" case="first-letter">Special</namespace> <namespace key="0" case="first-letter"/> <namespace key="1" case="first-letter">Talk</namespace> <namespace key="2" case="first-letter">User</namespace> <namespace key="3" case="first-letter">User talk</namespace> <namespace key="4" case="first-letter">Wikipedia</namespace> <namespace key="5" case="first-letter">Wikipedia talk</namespace> <namespace key="6" case="first-letter">File</namespace> <namespace key="7" case="first-letter">File talk</namespace> <namespace key="8" case="first-letter">MediaWiki</namespace> <namespace key="9" case="first-letter">MediaWiki talk</namespace> <namespace key="10" case="first-letter">Template</namespace> <namespace key="11" case="first-letter">Template talk</namespace> <namespace key="12" case="first-letter">Help</namespace> <namespace key="13" case="first-letter">Help talk</namespace> <namespace key="14" case="first-letter">Category</namespace> <namespace key="15" case="first-letter">Category talk</namespace> <namespace key="100" case="first-letter">Portal</namespace> <namespace key="101" case="first-letter">Portal talk</namespace> <namespace key="108" case="first-letter">Book</namespace> <namespace key="109" case="first-letter">Book talk</namespace> </namespaces>
</siteinfo>
Thanks
Erol Akarsu
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