Help:Database layout: Difference between revisions
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Moved with full histories. -- Rob Church, 04:00, 28 December 2006 (UTC) |
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<small>Other languages: [[Help:データベースレイアウト|日本語 (ja)]] ...[[Meta:Interlanguage links|''Translate this page!'']]</small> |
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<- [[MediaWiki architecture]] |
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Most data for the wiki is stored in a database. See [[MySQL config]] for setup info. |
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(Some data lives only in the [[MediaWiki file usage|filesystem]], other data is just cached there. Data may also be cached in [[memcached]], but lives permanently in the database.) |
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'''NB: the current schema for any version - with copious comments - can be found in the <tt>maintenance/tables.sql</tt> file. The latest version can be obtained [http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/wikipedia/phase3/maintenance/tables.sql from CVS].''' |
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Version 1.4 uses the following tables: |
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*[[archive table]] - "deleted" pages |
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*[[blobs table]] |
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*[[brokenlinks table]] - links in internal link style to non-existing pages in the same project (see below) |
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*[[categorylinks table]] |
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*[[cur table]] - current pages |
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*[[hitcounter table]] |
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*[[image table]] |
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*[[imagelinks table]] tracks usage of images in wikipages (see below) |
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*[[interwiki table]] |
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*[[ipblocks table]] |
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*[[links table]] - links in internal link style to existing pages in the same project (see below) |
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*[[linkscc table]] - (see below) |
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*[[math table]] |
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*[[objectcache table]] |
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*[[old table]] - old versions of pages |
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*[[oldimage table]] |
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*[[querycache table]] |
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*[[recentchanges table]] |
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*[[searchindex table]] |
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*[[site_stats table]] |
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*[[testac table]] |
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*[[user table]] |
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*[[user_newtalk table]] |
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*[[watchlist table]] |
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==Explanation of the link tables== |
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There are presently three link tables: ''links'', ''brokenlinks'' and ''imagelinks''. There are a couple of uses for these tables: |
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* enables "What links here" and "Related changes" to work, looking at incoming or outgoing links |
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* provides the list of pages that use an image shown on an image's description page |
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* allows making reports of pages that aren't linked (Orphans, Unused images) or are linked to but don't exist (Most wanted pages) |
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* slightly speed up page rendering by avoiding individual checks for the existence of each linked page to determine how to render its link |
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The latest software also adds a 'linkscc' table which caches data from the other three tables. This is used only for speeding rendering. |
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=== Maintenance of link tables === |
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If you import data to the cur table and don't [[rebuild link tables|rebuild the links]], you |
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won't be able to use "[[What links here]]", "[[Related changes]]", "[[Orphans]]", |
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etc. If you don't want to, well I suppose that's okay... (Brion Vibber) |
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== ERD Diagram == |
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This is the diagram from the mediawiki database 1.4.X version. |
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<center> |
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[[Image:DER Mediawiki.PNG]] |
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</center> |
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It shows the main tables and relations from the database. |
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==See also== |
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*[[Experimental new database schema]] ''22:55, 24 Jul 2003'' |
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*[[Proposed Database Schema Changes]] ''18:19, 23 Dec 2003'' |
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*[[en:Wikipedia:Database queries]] |
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*[[nl:Wikipedia:SQL opdrachten]] |
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*[[Documentation: Developer's Guide]] |
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Next page: [[MediaWiki User's Guide: Installation| Installation]] > |
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[[Category:MediaWiki User's Guide]] |
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[[Category:MediaWiki Development]] |
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Latest revision as of 17:24, 8 February 2021
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This page has been moved to Manual:Database layout on mediawiki.org.
Any modifications or additions to this page should be made on mediawiki.org instead. |
Moved with full histories. -- Rob Church, 04:00, 28 December 2006 (UTC)