Manual talk:MWDumper

Process Error
When I tried to process an xml file exported by the wikipedia export page, i.e. import it into mysql database, I got this error "XML document structures must start and end within the same entity". Has any one come across this before? How did you solve the problem eventually? Or is it a bug at the moment? Thank you all in advance. I look forward to someone discussing it.

I got this error when import with *.xml.bz2 file, but after uncompress it to *.xml, this error is gone.

Table Creation
I am interested in using wikipedia for research and do not need the web front end. I cannot use the browser based setup used by mediawiki. is there either a list of create table statements necessary to make this database, or a not browser version of the mediawiki setup?
 * Just install MediaWiki and SHOW CREATE TABLE `table_name` in your SQL client.

GFDL
From http://mail.wikipedia.org/pipermail/wikitech-l/2006-February/033975.html:


 * I hereby declare it GFDL and RTFM-compatible. :) -- brion vibber


 * So this article, which started as a the README file from MWDumper, is allowed on the wiki. This might be good, as I tend to read wikis more than I read READMEs! --Kernigh 04:53, 12 February 2006 (UTC)

Example (in)correct?
Is the parameter -d correct described in this example?
 * java -jar mwdumper.jar --format=sql:1.5 pages_full.xml.bz2 | mysql -u -p
 * Rebuild and execute. Disclaimer: Use at your own risk.

Importing to a database with table prefix for wiki
I want to import "XML export" of Mediawiki to a local wiki but it tries to import them to non-prefixed tables however my tables have got prefix. How can I solve this problem? Is there a solution to import xml to prefixed tables (like fa_page, fa_text, fa_revisions) by this software? It's so bad if it doesn't have this feature.--Soroush 16:40, 5 September 2007 (UTC)

Yes. Open text processor, paste
 * 1) !/usr/bin/perl

while(<>) { s/INTO /INTO yourprefixhere_/g; print; }

save it as prefixer.pl. Run MWDumper with -output=file:temp.sql option (instead of --output=mysql:..). Execute perl prefixer.pl < temp.sql > fill.sql Run mysql -u wikiuser -p yourpasswordhere Type use wikidb then source fill.sql --Derbeth talk 21:11, 31 October 2007 (UTC)

Source Code
Is the source code to mwdumper available?
 * http://svn.wikimedia.org/viewvc/mediawiki/trunk/mwdumper/ --78.106.145.69 22:17, 23 October 2007 (UTC)
 * http://svn.wikimedia.org/svnroot/mediawiki/trunk/mwdumper/ --82.255.239.71 09:52, 16 March 2008 (UTC)
 * https://git.wikimedia.org/git/mediawiki/tools/mwdumper.git

Overwrite
How to overwrite articles which already exist? Werran 21:08, 10 April 2008 (UTC)

Size restrictions
Maybe you can add a feature for how many pages or how big the resulting dump can be?

More recent compiled version
The latest compiled version of MWDumper in tools/ dates from 2006-Feb-01, while http://svn.wikimedia.org/svnroot/mediawiki/trunk/mwdumper/README shows changes to the code up to 2007-07-06. The *.jar version from 2006 doesn't work on recent Commons dumps, and I don't know how to compile the program under Windows. Could you please make a more recent compiled version available? -- JovanCormac 06:28, 3 September 2009 (UTC)

This one? http://downloads.dbpedia.org/mwdumper_invalid_contributor.zip


 * Can someone compile latest rev for Windows? Version above replaces the contributor credentials with 127.0.0.1 ;<

Filtering does not seem to work
I want to import only a few pages from the whole English Wikipedia to my database. I suppose, I should give the title of the desired pages in a file (line by lines) and use the "--filter=list:fileName" option. But, when I tried this option, it seems that filtering does not have any effect and the script starts to import pages, saying 4 pages, 1000 versions, 4 pages, 2000 versions and so on which imports some other pages not listed in the filtering option.

This is the command that I use:

java -jar mwdumper.jar --filter=exactlist:titles --filter=latest --filter=notalk --output=file:out.txt --format=xml datasets/enwiki-latest-pages-meta-history.xml

0.4 compatible version?
Given that dumps are now in version 0.4 format ("http://www.mediawiki.org/xml/export-0.4/ http://www.mediawiki.org/xml/export-0.4.xsd" version="0.4") and MWDumper's page says "It can read MediaWiki XML export dumps (version 0.3, minus uploads)," are there plans to support the 0.4 version? I didn't have success with it as it is, perhaps operator error, but I think not. Thanks

Encoding
Here: Manual:MWDumper This is mentioned: '' Make sure the database is expecting utf8-encoded text. If the database is expecting latin1 (which MySQL does by default), you'll get invalid characters in your tables if you use the output of mwdumper directly. One way to do this is to pass --default-character-set=utf8 to mysql in the above sample command.

Also make sure that your MediaWiki tables use CHARACTER SET=binary. Otherwise, you may get error messages like Duplicate entry in UNIQUE Key 'name_title' because MySQL fails to distinguish certain characters.''

How is it possible to use --default-character-set=utf8 and make sure the character set=binary at the same time?

If the character set is utf8 is not binary... Can somebody explain how to force CHARACTER SET=binary while using --default-character-set=utf8? Is this possible?

Steps taken to restore Frysk Wikipedia

 * Make sure you select the option 'Experimental MySQL 4.1/5.0 binary' when selecting the type of database (in Mediawiki 1.11.2 on Ubuntu 8.04).
 * This is the batch-file (thanks for the tip in bug 14379):
 * especially the &characterEncoding=UTF-8 helps a lot
 * the mwdumper program was updated to allow for continuing when a batch of 100 records fails because of dumplicate keys. (Yes, they still happen) Please contact gerke dot ephorus dot groups at gmail dot com to request a updated version. (Sorry, no github version available yet, maybe after my holiday ;-) )

SQL Output Going to the Wrong Place
I am trying to simply take an XML dump and convert it to SQL code, which I will then run on a MySQL server. The code I've been using to do so is below:

java -jar mwdumper.jar --format=sql:1.5 --output=file:stubmetahistory.sql --quiet enwiki-20100312-stub-meta-history.xml > out.txt

What I've found is happening is that the file that I would like to be a SQL file (stubmetahistory.sql) is an exact XML copy of the original file (enwiki-20100312-stub-meta-history.xml). However, what is appearing on the screen and being piped to the out.txt file is the SQL file I am looking for. Any thoughts on what I am doing wrong, or what I am missing here to get this correct? The problem of course with just using the out.txt to load into my MySQL server is that there could be problems with the character encoding.

Thank you, CMU Researcher 20:37, 19 May 2010 (UTC)

Alternatives
For anyone unfamiliar with Java (such as myself), is there any other program we can use? 70.101.99.64 21:09, 21 July 2010 (UTC)


 * There are a bunch listed here.. Manual:Importing XML dumps

Java GC
There seems to be a problem with the garbage collection in mwdumper. On trying to import the Wikipedia 20100130 English dump containing 19,376,810 pages and 313,797,035 revisions, it aborts with the error after 4,216,269 pages and 196,889,000 revs:

Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded at java.util.Arrays.copyOfRange(Arrays.java:3209) at java.lang.String. (String.java:215) at org.mediawiki.importer.XmlDumpReader.bufferContents(Unknown Source) at org.mediawiki.importer.XmlDumpReader.bufferContentsOrNull(Unknown Source) at org.mediawiki.importer.XmlDumpReader.readText(Unknown Source) at org.mediawiki.importer.XmlDumpReader.endElement(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:198) at org.mediawiki.importer.XmlDumpReader.readDump(Unknown Source) at org.mediawiki.dumper.Dumper.main(Unknown Source)

The recommended suggestion (http://forums.sun.com/thread.jspa?threadID=5114529; http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html#par_gc.oom) of turning off this feature is NOT feasible as the error is thrown when 98% of the program is spent in GC and under 2% of the heap is recovered. I would appreciate any help or comments.

Some section on building from SVN checkout?
How do you build the JAR from an SVN checkout. I think we should include it on this page. I'm a java JAR newbie and I couldn't get it to work.


 * In the root folder (folder with build.xml), type "ant". It should put the new jar file in mwdumper/build/mwdumper.jar.

Editing Code to add tab delimited output
I've had success using the mwdumper to dump Wikipedia data into MySQL, but I'd like to do some analysis using Hadoop (Hive or Pig). I will need the Wikipedia data (revision, page, and text tables) in tab delimited or really any other delimiter to dump it into a cluster. How difficult would it be to make those modifications? Could you point out where in the code I should be looking? It would also be nice to be able to filter by table (e.g., have a seperate txt output for each table).

Needed to DELETE before running MWDumper
I installed and configured a fresh Mediawiki 1.16.2 install, and found that before I could run MWDumper successfully I had to delete all rows from the page, text, and revision tables (USE wikidb; DELETE page; DELETE text; DELETE revision). If I didn't do this first I received the error: "ERROR 1062 (23000) at line xxx: Duplicate entry '1' for key 'PRIMARY'". Dcoetzee 10:32, 21 March 2011 (UTC)

FIX: Editing Code to add tab delimited output
I've update mwdumper with a new dumper class that can be used to export a flat file (tab delimited). The updated code is at https://github.com/bcollier/mwdumper.

error: 11 million pages in enwiki
I have installed mwdumper and just ran it against an uncompressed version of enwiki-20110901-pages-articles.xml.bz2.

I was expecting ~4 million articles but it processed ~11 million before stopping; however, at that point it was sending all the sql output to null (oops). Now I fixed the sql problem and am using phpMyAdmin to watching mwdumper trundle along writing rows.

mwdumper is on 1,567,000 rows and phpMyAdmin is seeing this:

Table 	 Action	Rows 	Type	Collation	Size	Overhead

page		~1,564,895	InnoDB	binary	296.6 MiB revision	~1,441,088	InnoDB	binary	590.1 MiB textp	~10,991,108	InnoDB	binary	10.9 GiB

Should it complete when mwdumper gets to 4 million or when it gets to 11 million?

'''I made an import of enwiki in Mai 2015. Result was about 17 million imported pages.'''

Error: Duplicate entry '1' for key 'PRIMARY'
If there is ERROR 1062 (23000) at line 35: Duplicate entry '1' for key 'PRIMARY' when restoring database dump to new mediawiki install it is because mwdumper expects that database is empty. With default mediawiki install there is sample pages. Error can be solved by clearing the database. I did it with this: echo "TRUNCATE TABLE page; TRUNCATE TABLE revision; TRUNCATE TABLE text;" | mysql -u $mediawikiuser -p $mediawikidatabase --91.153.53.216 01:07, 22 October 2011 (UTC)

at line 1: Duplicate entry '0-' for key 'name_title' Bye
Hi, I wanted to import a backup in mysql db get stuck with this error but SQLDumpSplitter have helped me so find the exact line. I don't know why but I get this error importing these two to mysql server. if know anybody knows the reason I will be happy to know.--Pouyana (talk) 22:00, 21 August 2012 (UTC)


 * I have this same issue when using the direct connection but not when piping through MySQL. It most likely has something to do with character encoding, but I'm not sure how to fix it. Dcoetzee (talk) 01:17, 2 April 2013 (UTC)

Under construction
It's been "very much under construction" since 11 February 2006. Is that still the case, or should it be considered stable yet? Leucosticte (talk) 21:16, 16 September 2012 (UTC)

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2048
Hello

I have the following error : Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2048 at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source) at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source) at org.apache.xerces.impl.XMLEntityScanner.scanContent(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanContent(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:392) at javax.xml.parsers.SAXParser.parse(SAXParser.java:195) at org.mediawiki.importer.XmlDumpReader.readDump(XmlDumpReader.java:88) at org.mediawiki.dumper.Dumper.main(Dumper.java:142) when i try to import enwiki-20130708-pages-articles it crashes around the page 5 800 000

i have tested the build from june 26 without any luck

how can I fix this ?

thx

Also having the same problem. any help would be deeply appreciated. -- NutzTheRookie (talk) 11:31, 5 September 2013 (UTC)

I also find that: java -server -jar mwdumper-1.16.jar --format=sql:1.5 enwiki-20131202-pages-articles.xml.bz2 crashes soon after 4 510 000 pages with an identical stack trace.


 * ==Same problem==

4,510,000 pages (5,294.888/sec), 4,510,000 revs (5,294.888/sec) Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2048 at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source) at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source) at org.apache.xerces.impl.XMLEntityScanner.scanContent(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanContent(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:392) at javax.xml.parsers.SAXParser.parse(SAXParser.java:195) at org.mediawiki.importer.XmlDumpReader.readDump(XmlDumpReader.java:88) at org.mediawiki.dumper.Dumper.main(Dumper.java:142)

This is a Xerces bug, documented at https://issues.apache.org/jira/browse/XERCESJ-1257

The workaround suggested is to use the JVM's UTF-8 reader instead of the Xerces UTF8Reader. I tried this suggested workaround, and it seemed to fix it for me. I made this change:

public void readDump throws IOException { try { SAXParserFactory factory = SAXParserFactory.newInstance; SAXParser parser = factory.newSAXParser; Reader reader = new InputStreamReader(input,"UTF-8"); InputSource is = new InputSource(reader); is.setEncoding("UTF-8"); parser.parse(is, this); } catch (ParserConfigurationException e) { throw (IOException)new IOException(e.getMessage).initCause(e); } catch (SAXException e) { throw (IOException)new IOException(e.getMessage).initCause(e); }		writer.close; } When in src\org\mediawiki\importer\XMLDumpReader.java Don't forget to add import java.io.*; and add import org.xml.sax.InputSource; to the top of your file, to settle the imports.

Importing multiple XML files iteratively
Is there any setting in MWDumper that will allow the import of multiple XML exports iteratively? For example, if I have 100 pages with full history in separate XML files, is there any way to command MWDumper to import all files (full path data) from an external text file (a la wget -i)? Thanks. Wikipositivist (talk) 22:26, 19 November 2013 (UTC)

Any succes importing English wiki XML dump with mwdumper?
Was anyone able to import recent English Wikipedia XML dump with mwdumper? I tried multiple dumps from past few months and I'm getting varius erros like https://bugzilla.wikimedia.org/show_bug.cgi?id=57236 or https://bugzilla.wikimedia.org/show_bug.cgi?id=24909. Could someone share the last dump that can be imported with mwdumper? Jogers (talk) 21:46, 18 April 2014 (UTC)

How to use MwDumper on my shared host to import Dumps into my wiki?
I'm basically a noob. Can anyone tell me step by step of how can i import xml dumps into my wiki which is hosted. I'm not understanding anything from the manual. thanks.


 * You need to run it on your computer, and it will output a SQL file (you should redirect the output to a file). Then load the SQL file on the database server. Your shared host probably provides some sort of cpanel where you can access PhpMyAdmin to write SQL queries. From PhpMyAdmin there's an option to load an SQL file. --Ciencia Al Poder (talk) 18:57, 26 September 2015 (UTC)

Unable to import xml dump duplicate entry error
I am getting an error of a duplicate entry while I am importing the wikipedia 2008 dump into media wiki 1.24.4. I am using one of the methods on the import xml wiki page using java direct connection to mysql and mwdumper. After importing 182,000 pages it fails saying there is a duplicate entry. 182,000 pages (155.23/sec), 182,000 revs (155.23/sec) Exception in thread "main" java.io.IOException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '0-?' for key 'name_title' at org.mediawiki.importer.XmlDumpReader.readDump(XmlDumpReader.java:92) at org.mediawiki.dumper.Dumper.main(Dumper.java:142) Caused by: org.xml.sax.SAXException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '0-?' for key 'name_title' at org.mediawiki.importer.XmlDumpReader.endElement(XmlDumpReader.java:229) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:392) at javax.xml.parsers.SAXParser.parse(SAXParser.java:195) at org.mediawiki.importer.XmlDumpReader.readDump(XmlDumpReader.java:88) ... 1 more

At the time my charset was utf8 so after I read a troubleshooting page someone with the same issue said it might be caused by not having the charset to binary. So I changed it to binary and still got the same error. I am not sure how to proceed to fix this issue. Does anyone know why I am getting this error? --Ksures (talk) 20:38, 30 October 2015 (UTC)

SOLUTION:
When you first make a DB to store the dump, even before applying mwdumper, you should specify the charset for that DB: CREATE DATABASE wikidb DEFAULT CHARACTER SET utf8;

java.lang.IllegalArgumentException: Invalid contributor
Doing this on a debian linux machine, i get this exception:

2,439 pages (0.595/sec), 55,000 revs (13.42/sec) 2,518 pages (0.614/sec), 56,000 revs (13.656/sec) 2,630 pages (0.641/sec), 57,000 revs (13.891/sec) 2,865 pages (0.698/sec), 58,000 revs (14.13/sec) Exception in thread "main" java.lang.IllegalArgumentException: Invalid contributor at org.mediawiki.importer.XmlDumpReader.closeContributor(Unknown Source) at org.mediawiki.importer.XmlDumpReader.endElement(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:195) at org.mediawiki.importer.XmlDumpReader.readDump(Unknown Source) at org.mediawiki.dumper.Dumper.main(Unknown Source) root@odroid-server:/var/storage/temp#

Any Ideas how to fix this?

Update from Dezember 2015
Where can i download the latest version (jar-file) from Dezember 2015? https://dumps.wikimedia.org/tools/ is outdated. Thx


 * There are no new dumps available AFAIK. But compilation should be straightforward. Install maven and then follow the steps in the "How to build MWDumper from source" section --Ciencia Al Poder (talk) 17:08, 10 February 2016 (UTC)

Cannot import recent dumps
Is mwdumper still considered a recommended way to import Wikipedia database? I couldn't get it to work at all in English Wikipedia dumps since May 2015.

It always fails with either "MySQLIntegrityConstraintViolationException: Duplicate entry" or "SAXParseException: XML document structures must start and end within the same entity". I was able to get around the first exception by removing uniqueness constraint on page title field. But it fails with the second one later or with "SAXParseException: The element type "parentid" must be terminated by the matching end-tag " "


 * The duplicate error may be because of edits happening while the dump is being generated, so the XML effectively has duplicate entries. That's probably a bug of the XML dump generation. About the not matching, it would be good to see the XML portion where this happen to see if this is indeed the problem, or maybe the XML dump you downloaded is cut off somehow... If the XML is not well formed, that's a bug on the XML dump generation, something that should be reported on phabricator --Ciencia Al Poder (talk) 11:37, 27 March 2016 (UTC)

Where is the my-huge.cnf sample config?
Is that available anywhere? I don't see it under /etc/mysql. Thanks. MW131tester (talk) 16:58, 9 February 2019 (UTC)


 * It was removed because it's dated, according to https://mariadb.com/kb/en/library/configuring-mariadb-with-option-files/#example-option-files --Ciencia Al Poder (talk) 14:45, 10 February 2019 (UTC)

The "huge wiki" instructions were added in July 2013 by an anonymous IP
Those instructions don't include any commands to, e.g., DROP PRIMARY KEY from the page table, and they say to readd it as CHANGE page_id page_id INTEGER UNSIGNED AUTO_INCREMENT rather than as int unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT like what you see in tables.sql. (Also, the rev_page_id index is supposedly getting removed from tables.sql in some future MediaWiki version, although this hasn't happened yet.) MW131tester (talk) 17:53, 9 February 2019 (UTC)
 * I've added a warning about this. Removing indices doesn't seem to be of much benefit when storage is InnoDB . Maybe for a fast import it would be better to use MyISAM? --Ciencia Al Poder (talk) 15:11, 10 February 2019 (UTC)
 * Hard to say; I removed the indexes, because I thought they were slowing down my script, and then discovered that my script was failing for other reasons. But I was using my own custom script rather than MWDumper.


 * If we wanted to make that script more robust, we could have it run "show index from" statements to see which indexes are there; and then it could execute the appropriate SQL statements depending on what MW version it realizes it's working with. MW131tester (talk) 14:25, 11 February 2019 (UTC)