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| {{Hi}}
| | #REDIRECT [[MetaWikiPedia:Database layout]] |
| {{Handbook sidebar|hacker toc}}
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| <small>Other languages: [[Help:???????????|??? (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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| See in the source: [http://cvs.sourceforge.net/viewcvs.py/wikipedia/phase3/docs/schema.doc?rev=1.2&view=markup schema.doc] and [http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/wikipedia/phase3/maintenance/tables.sql?rev=HEAD&content-type=text/vnd.viewcvs-markup maintenance/tables.sql]
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| Currently we have 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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| ==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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| *[[Database layout]]
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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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