Merge "Follow-up to typography changes to Vector"
[lhc/web/wiklou.git] / RELEASE-NOTES-1.23
1 Security reminder: MediaWiki does not require PHP's register_globals. If you
2 have it on, turn it '''off''' if you can.
3
4 == MediaWiki 1.23 ==
5
6 THIS IS NOT A RELEASE YET
7
8 MediaWiki 1.23 is an alpha-quality branch and is not recommended for use in
9 production.
10
11 === Configuration changes in 1.23 ===
12 * When $wgJobRunRate is higher that zero, jobs are now executed via an
13 asynchronous HTTP request to a MediaWiki entry point. This may require
14 increasing the number of server worker threads.
15 * $wgDebugLogGroups values may be set to an associative array with a
16 'destination' key specifying the log destination. The array may also contain
17 a 'sample' key with a positive integer value N indicating that the log group
18 should be sampled by dispatching one in every N messages on average. The
19 sampling is random.
20 * In addition to the current exception log format, MediaWiki now serializes
21 exception metadata to JSON and logs it to the 'exception-json' log group.
22 This makes MediaWiki easier to integrate with log aggregation and analysis
23 tools.
24 * $wgSquidServersNoPurge now supports the use of Classless Inter-Domain
25 Routing (CIDR) notation to specify contiguous blocks of IPv4 and/or IPv6
26 addresses that should be trusted to provide X-Forwarded-For headers.
27 * Preferences 'watchcreations', 'watchdefault', 'enotifwatchlistpages' ("Add
28 pages I create and files I upload to my watchlist", "Add pages and files I
29 edit to my watchlist", "Email me when a page or file on my watchlist is
30 changed") are now enabled by default. In addition new user accounts' personal
31 and talk pages are now watched by them by default.
32 * $wgLBFactoryConf: Class names have had underscores removed. The configuration
33 should be updated if LBFactory_Simple or LBFactory_Multi is configured.
34 * $wgPasswordSenderName has been removed and is no longer functional. To set a
35 custom mailer name, the system message 'emailsender' should be modified
36 (default: "{{SITENAME}}").
37 * $wgDBAhandler was removed as the only class using it was also removed
38 * The 'max threads' setting was removed from $wgDBservers.
39 * Support for AdminSettings.php has been completely removed. All configuration
40 belongs in LocalSettings.php.
41 * $wgSkipSkin, which has been replaceable by $wgSkipSkins since 2005 (r9249), is
42 now formally deprecated.
43 * Removed deprecated $wgDisabledActions as it is hardly used anywhere.
44 * $wgRateLimitLog has been deprecated and replaced by
45 $wgDebugLogGroup['ratelimit'].
46 * $wgLocalInterwikis is an array containing multiple local interwiki prefixes
47 (interwiki prefixes that point back to the current wiki). This effectively
48 allows more than one value of $wgLocalInterwiki to be specified and
49 understood by the parser. The value of $wgLocalInterwiki is automatically
50 prepended to the start of this array.
51 * $wgQueryPages has been removed. Query Pages should be added to by using the
52 wgQueryPages hook.
53 * $wgHttpOnlyBlacklist has been removed.
54 * $wgLicenseTerms has been removed as it was unused.
55
56 === New features in 1.23 ===
57 * ResourceLoader can utilize the Web Storage API to cache modules client-side.
58 Compared to the browser cache, caching in Web Storage allows ResourceLoader
59 to be more granular about evicting stale modules from the cache while
60 retaining the ability to retrieve multiple modules in a single HTTP request.
61 This capability can be enabled by setting $wgResourceLoaderStorageEnabled to
62 true. This feature is currently considered experimental and should only be
63 enabled with care.
64 * (bug 6092) Add expensive parser functions {{REVISIONID:}}, {{REVISIONUSER:}}
65 and {{REVISIONTIMESTAMP:}} (with friends).
66 * Add "wgRelevantUserName" to mw.config containing the current
67 Skin::getRelevantUser value.
68 * (bug 56033) Add content model to the page information.
69 * Added Article::MissingArticleConditions hook to give extensions a chance to
70 hide their (unrelated) log entries.
71 * Added LonelyPagesQuery hook to let extensions modify the query used to
72 generate Special:LonelyPages.
73 * Added $wgOpenSearchDefaultLimit defining the default number of entries to show
74 on action=opensearch API call.
75 * For namespaces with $wgNamespaceProtection (including the MediaWiki
76 namespace), the "protect" tab will be shown only if there are restriction
77 levels available that would restrict editing beyond what
78 $wgNamespaceProtection already applies. The protection form will offer only
79 those protection levels.
80 * Added $wgAPIFormatModules, allowing extensions to add additional output
81 formatting modules for the API.
82 * (bug 47812) The MediaWiki:Group-user.{css,js} pages can now be used to add
83 custom CSS or JavaScript enabled only for registered users.
84 * (bug 52005) Special pages RecentChanges, RecentChangesLinked and Watchlist
85 now include a legend describing the symbols used in lists of changes.
86 * Improved the accessibility of the tabs in Special:Preferences.
87 * Added ApiBeforeMain hook, roughly equivalent to the BeforeInitialize hook:
88 it's called after everything is set up but before any major processing
89 happens.
90 * The jquery.client module now performs a component-wise version comparison in
91 its #test method when strings are used in the browser map: version '1.10' is
92 now correctly considered larger than '1.2'. Using numbers in the version map
93 is not affected.
94 * All API modules now support an assert parameter, which can either be
95 'user' or 'bot'. The API will throw an error if the user is not logged
96 in (user) or does not have the 'bot' userright (bot). Based off of the
97 AssertEdit extension by Steve Sanbeg.
98 * WikitextContent will now render redirects with the expected "redirect"
99 header, rather than as an ordered list. Code calling Article::viewRedirect
100 can probably be changed to no longer special-case redirects.
101 * [[Special:Diff]] was added, allowing users to create internal links to
102 revision comparison pages using syntax such as [[Special:Diff/12345]],
103 [[Special:Diff/12345/prev]] or [[Special:Diff/12345/98765]].
104 * New user accounts' personal and talk pages are now watched by them by default.
105 * Added SkinTemplateGetLanguageLink hook to allow changing the html of language
106 links.
107 * Added MessageCache::get hook as a new way to customize messages across
108 multiple sites.
109 * Added jquery.throttle-debounce ResourceLoader module to limit the number of
110 callbacks for frequently occurring events.
111 * Special:ProtectedPages shows now a table. The timestamp, the reason and
112 the protecting user is also shown.
113 * Added experimental support for using Microsoft SQL Server as the database
114 backend.
115 ** Added new Microsoft SQL Server-specific configuration variable
116 $wgDBWindowsAuthentication, which makes the web server authenticate against
117 the database server using Integrated Windows Authentication instead of
118 $wgDBuser/$wgDBpassword.
119 * HTMLForm 'select', 'selectandother', 'selectorother', 'multiselect', and
120 'radio' fields can now use message keys as labels via the 'options-messages'
121 parameter, which overrides the 'options' parameter.
122 * Admins can expire users users passwords manually, or on a schedule using the
123 $wgPasswordExpirationDays configuration setting.
124 * Add new hook SendWatchlistEmailNotification, this will be used to determine
125 whether to send a watchlist email notification.
126 * (bug 42026) Special:Contributions now includes an option to filter page
127 creations, similar to the topOnly option.
128 * Add mediawiki.ui.button styling to all pages so wiki content can use styled
129 buttons.
130 * Special:UserLogin/signup now does AJAX checks for invalid and taken usernames,
131 displaying the error live.
132 * Added BaseTemplateAfterPortlet hook to allow injecting html after portlets in skins.
133 * Support has been added for a JSON based localisation file format. The
134 installer has been updated to use it.
135 * Changes to content typography (fonts, line-height, etc.). See
136 https://www.mediawiki.org/wiki/Typography_refresh for further information.
137
138 === Bug fixes in 1.23 ===
139 * (bug 41759) The "updated since last visit" markers (on history pages, recent
140 changes and watchlist) and the talk page message indicator are now correctly
141 updated when the user is viewing old revisions of pages, instead of always
142 acting as if the latest revision was being viewed.
143 * (bug 56443) Special:ConfirmEmail no longer shows a "Mail a confirmation code"
144 when the email address is already confirmed. Also, consistently use
145 "confirmed", rather than "authenticated", when messaging whether or not the
146 user has confirmed an email address.
147 * (bug 19415) action=render no longer shows section edit links. This affects
148 behavior of several other features where (bogus) section edit links will
149 disappear, such as file description pages loaded via $wgUseInstantCommons or
150 pages transcluded cross-wiki via $wgEnableScaryTranscluding.
151 * (bug 56912) Show correct link color on cached result of Special:DeadendPages.
152 * Classes TitleListDependency and TitleDependency have been removed, as they
153 have been found unused in core and extensions for a long time.
154 * (bug 57098) SpecialPasswordReset now obeys returnto parameter
155 * (bug 37812) ResourceLoader will notice when a module's definition changes and
156 recompile it accordingly.
157 * (bug 57201) SpecialRecentChangesFilters hook is now executed for feeds.
158 * (bug 58640) Fixed a compatibility issue with PCRE 8.34 that caused pages
159 to appear blank or with missing text.
160 * (bug 56931) Updated the plural rules to CLDR 24. They are in new format
161 which is detailed in UTS 35 Rev 33. The PHP parser and evaluator as well as
162 the JavaScript evaluator were updated to support the new format. Plural rules
163 for some languages have changed, most notably Russian. Affected software
164 messages have been updated and marked for review at translatewiki.net.
165 * (bug 14323) Redirect pages, when viewed with redirect=no, no longer hide the
166 remaining page content.
167 * (bug 23542) imagelinks now stores both the redirect and target (as
168 templatelinks does).
169 * (bug 58167) The web installer no longer throws an exception when PHP is
170 compiled without support for MySQL yet with support for another DBMS.
171 * (bug 56199) Raw option of parser functions must now match complete word,
172 to take effect.
173 * (bug 60543) Special:PrefixIndex forgot stripprefix=1 for "Next page" link
174 * (bug 29762) Undoing an already-undone edit will now display an appropriate
175 message instead of leading the user to make a null edit.
176 * (bug 52659) mediawiki.notification: Notification area remained visible when
177 empty and thus was stealing pointer events from links on the page.
178 * (bug 26811) When a DBUnexpectedError occurs, DB server hostnames are now
179 hidden unless $wgShowExceptionDetails is true, and $wgShowDBErrorBacktrace
180 no longer applies in such cases.
181 * (bug 60960) Avoid doing file_exist() checks on data: URIs, as they cause
182 warnings to be printed on Windows due to large path length.
183
184 === Web API changes in 1.23 ===
185 * (bug 54884) action=parse&prop=categories now indicates hidden and missing
186 categories.
187 * action=query&meta=filerepoinfo now returns additional information for each
188 repo.
189 * action=parse&prop=languageshtml was deprecated in 1.18 and will be removed in
190 MediaWiki 1.24.
191 * action=parse now has disabletoc flag to disable table of contents in output.
192 * (bug 25702) list=allcategories, list=allimages, list=alllinks, list=allpages,
193 list=deletedrevs and list=filearchive did not handle case-sensitivity
194 properly for all parameters.
195 * ApiQueryBase::titlePartToKey allows an extra parameter that indicates the
196 namespace in order to properly capitalize the title part.
197 * (bug 57874) action=feedcontributions no longer has one item more than limit.
198 * All API modules now support an assert parameter. See the new features section
199 for more details.
200 * Added prop=contributors to fetch the list of contributors to the page.
201 * The following API modules will now return entries where fields have been
202 revision-deleted: list=deletedrevs, list=filearchive, list=recentchanges,
203 list=watchlist. "hidden" indicators will be included, in the same style as is
204 already done for prop=revisions.
205 * The following API modules will now return the content of revision-deleted
206 fields, in addition to the "hidden" indicators, if the querying user has the
207 necessary rights: list=logevents, list=usercontribs, prop=imageinfo,
208 prop=revisions.
209 * The above modules, where applicable, will now return entries filtered by
210 revision-deleted fields if the querying user has the necessary rights. For
211 example, prop=revisions with rvuser or rvexcludeuser will no longer skip
212 revisions where the user was revision-deleted if the current user has the
213 deletedhistory right.
214 * The 'hideuser' right, used when blocking, is no longer necessary or
215 sufficient for seeing contributions with revision-deleted in
216 list=usercontribs.
217 * list=watchlist now uses the querying user's rights rather than the wlowner's
218 rights when checking whether wlprop=patrol is allowed.
219 * (bug 32151) ApiWatch now has pageset capabilities (titles/pageids/generators).
220 Title parameter is now deprecated.
221 * (bug 23005) Added action=revisiondelete.
222 * Added siprop=restrictions to API action=query&meta=siteinfo for querying
223 possible page restriction (protection) levels and types.
224 * Added prop 'limitreportdata' and 'limitreporthtml' to action=parse.
225 * (bug 58627) Provide language names on action=parse&prop=langlinks.
226 * Deprecated llurl= in favour of llprop=url for action=query&prop=langlinks.
227 * Added llprop=langname and llprop=autonym for action=query&prop=langlinks.
228 * prop=redirects is added, to return redirects to the pages in the query.
229 * list=allredirects is added, to list all redirects pointing to a namespace.
230 * (bug 42026) Added ucshow={new,!new,top,!top} to list=usercontribs.
231 Also added newonly to action=feedcontributions.
232 * (bug 42026) Deprecated uctoponly in favor of ucshow=top.
233 * list=search no longer has a "srredirects" parameter. Redirects are now
234 included in all searches.
235
236 === Languages updated in 1.23 ===
237
238 MediaWiki supports over 350 languages. Many localisations are updated
239 regularly. Below only new and removed languages are listed, as well as
240 changes to languages because of Bugzilla reports.
241
242 * Support was added for Northern Luri (lrc).
243
244 === Other changes in 1.23 ===
245 * The rc_type field in the recentchanges table has been superseded by a new
246 rc_source field. The rc_source field is a string representation of the
247 change type where rc_type was a numeric constant. This field is not yet
248 queried but will be in a future point release of 1.22.
249 ** Utilize update.php to create and populate this new field. On larger wiki's
250 which do not wish to update recentchanges table in one large update please
251 review the sql and comments in maintenance/archives/patch-rc_source.sql.
252 ** The rc_type field of recentchanges will be deprecated in a future point
253 release.
254 * The global variable $wgArticle has been removed after a lengthy deprecation.
255 * The global functions addButton and insertTags (for mw.toolbar.addButton and
256 mw.toolbar.insertTags) now emits mw.log.warn when accessed.
257 * The ExpandTemplates extension has been moved into MediaWiki core.
258 * (bug 52812) Removed "Disable search suggestions" from Preference.
259 * (bug 52809) Removed "Disable browser page caching" from Preference.
260 * Three new modules intended for use by custom skins were added:
261 'skins.common.elements', 'skins.common.content', and 'skins.common.interface',
262 representing three levels of standard MediaWiki styling. Previously skin
263 creators wishing to use them had to refer to the file names of appropriate
264 files directly, which is now discouraged.
265 * The modules 'skins.vector' and 'skins.monobook' have been renamed to
266 'skins.vector.styles' and 'skins.monobook.styles', respectively,
267 and their definition was changed not to include the common*.css files;
268 the two skins now load the 'skins.common.interface' module instead.
269 * A page_links_updated field has been added to the page table.
270 * SpecialPage::getTitle has been deprecated in favor of
271 SpecialPage::getPageTitle.
272 * BREAKING CHANGE: Two potentially backwards-incompatible changes have been made
273 to the 'SpecialWatchlistQuery' hook's last parameter (array $values) to make
274 the hook more consistent with the 'SpecialRecentChangesQuery' one:
275 ** Several array keys have been renamed: hideMinor → hideminor,
276 hideBots → hidebots, hideAnons → hideanons, hideLiu → hideliu,
277 hidePatrolled → hidepatrolled, hideOwn → hidemyself.
278 ** The parameter value is now a FormOptions object, not a plain array (array
279 access operators should continue to work, as it implements the ArrayAccess
280 interface).
281 * Option to mark hooks as deprecated has been added.
282 * (bug 52811) Preference "Enable section editing via [edit] links" was removed.
283 * (bug 52813) Preference "Show table of contents (for pages with more than
284 3 headings)" was removed.
285 * (bug 52810) Preference "Justify paragraphs" was removed.
286 * OutputPage::showErrorPage raises a notice if arguments are incoherent.
287 * Thumbnails that keep failing to render in thumb.php will be rate-limited
288 againt further render attempts for 1 hour. $wgAttemptFailureEpoch can be
289 altered to reset all rate-limited thumbnails at once.
290 * (bug 56572) Builds of the OOjs and OOjs UI libraries are now available.
291 * mw.loader.go and mw.loader.version have been removed.
292 * (bug 52815) Preference "Enable simplified search bar (Vector skin only)"
293 was removed.
294 * A user_password_expires column has been added to the user table. The User
295 object expects this column to exist. Use update.php to create this new field.
296 * The jquery.delayedBind ResourceLoader module was deprecated in favor of the
297 jquery.throttle-debounce module. It will be removed in MediaWiki 1.24.
298 * mw.user.bucket has been deprecated.
299 * On Special:PrefixIndex, a table#mw-prefixindex-list-table was changed to
300 table.mw-prefixindex-list-table to avoid duplicate ids when the special page
301 is transcluded.
302 * (bug 62198) window.$j has been deprecated.
303 * Preference "Disable link title conversion" was removed.
304 * SpecialRecentChanges no longer includes any functionality for generating feeds
305 - it has been factored out to ApiFeedRecentChanges. Old URLs redirect to new
306 ones.
307 * RecentChange::mExtra['lang'] is no longer set and should no longer be used.
308 Extensions should read from other configuration variables, including
309 $wgLocalInterwikis, to identify the current wiki.
310 * Sections in the parser test framework have been renamed and the old
311 section names are deprecated. Please use "!!wikitext" and "!!html"
312 (or "!!html/php") instead of "!!input" and "!!result". This allows
313 us to extend parser tests to accommodate additional input/output
314 pairs, such as "!!html/parsoid" (for the output of the Parsoid
315 parser, where it differs from the PHP parser).
316 * Special:Search no longer has an "include redirects" option on the advanced
317 tab. Redirects are now included in all searches.
318
319 ==== Removed classes ====
320 * FakeMemCachedClient (deprecated in 1.18)
321 * RdfMetaData (unused)
322 * TitleDependency (unused)
323 * TitleListDependency (unused)
324 * WikiError (deprecated in 1.17)
325 * WikiXmlError (deprecated in 1.17)
326 * WikiErrorMsg (deprecated in 1.17)
327
328 ==== Renamed classes ====
329 * CdbReader_DBA to CdbReaderDBA
330 * CdbReader_PHP to CdbReaderPHP
331 * CdbWriter_DBA to CdbWriterDBA
332 * CdbWriter_PHP to CdbWriterPHP
333 * DiffOp_Add to DiffOpAdd
334 * DiffOp_Change to DiffOpChange
335 * DiffOp_Copy to DiffOpCopy
336 * DiffOp_Delete to DiffOpDelete
337 * HWLDF_WordAccumulator to HWLDFWordAccumulator
338 * LBFactory_Fake to LBFactoryFake
339 * LBFactory_Multi to LBFactoryMulti
340 * LBFactory_Simple to LBFactorySimple
341 * LBFactory_Single to LBFactorySingle
342 * LCStore_Accel to LCStoreAccel
343 * LCStore_CDB to LCStoreCDB
344 * LCStore_DB to LCStoreDB
345 * LCStore_Null to LCStoreNull
346 * LoadBalancer_Single to LoadBalancerSingle
347 * LoadMonitor_MySQL to LoadMonitorMySQL
348 * LoadMonitor_Null to LoadMonitorNull
349 * LocalisationCache_BulkLoad to LocalisationCacheBulkLoad
350 * csvStatsOutput to CsvStatsOutput
351 * extensionLanguages to ExtensionLanguages
352 * languages to Languages
353 * statsOutput to StatsOutput
354 * textStatsOutput to TextStatsOutput
355 * wikiStatsOutput to WikiStatsOutput
356
357 ==== Removed methods ====
358 * ApiBase::getValidNamespaces() (deprecated in 1.17)
359 * ApiMain::setCachePrivate() (deprecated in 1.17)
360 * ApiMain::setVaryCookie (deprecated in 1.17)
361 * Article::doRedirect() (deprecated in 1.18)
362 * Article::doUnwatch() (deprecated in 1.18)
363 * Article::doWatch() (deprecated in 1.18)
364 * Article::forUpdate() (deprecated in 1.18)
365 * Article::markpatrolled() (deprecated in 1.18)
366 * Article::unwatch() (deprecated in 1.18)
367 * Article::watch() (deprecated in 1.18)
368 * Block::clear() (deprecated in 1.18)
369 * Block::decodeExpiry() (deprecated in 1.18)
370 * Block::encodeExpiry() (deprecated in 1.18)
371 * Block::forUpdate() (deprecated in 1.18)
372 * Block::infinity() (deprecated in 1.18)
373 * Block::load() (deprecated in 1.18)
374 * Block::newFromDB() (deprecated in 1.18)
375 * Block::normaliseRange() (deprecated in 1.18)
376 * Block::parseExpiryInput() (deprecated in 1.18)
377 * CategoryViewer::addSubcategory() (deprecated in 1.17)
378 * EditPage::spamPage() (deprecated since 1.17)
379 * Exif::getFormattedData() (deprecated in 1.18)
380 * Exif::makeFormattedData() (deprecated in 1.18)
381 * in_string (deprecated in 1.21)
382 * Language::convertLinkToAllVariants() (deprecated in 1.17)
383 * LanguageConverter::convertLinkToAllVariants() (deprecated in 1.17)
384 * Linker::makeBrokenLink() (deprecated in 1.16)
385 * Linker::makeBrokenLinkObj() (deprecated in 1.16)
386 * Linker::makeColouredLinkObj() (deprecated in 1.16)
387 * Linker::makeSizeLinkObj() (deprecated in 1.17)
388 * MediaWiki::articleFromTitle() (deprecated in 1.18)
389 * ParserOptions::getkin() (deprecated 1.18)
390 * ProfilerSimple::getCpuTime (deprecated in 1.20)
391 * Revision::revText() (deprecated in 1.17)
392 * SkinTemplate::jstext() (deprecated in 1.21)
393 * SpecialPage::__call() (deprecated in 1.17)
394 * SpecialPage::executePath() (deprecated in 1.18)
395 * SpecialPage::exists() (deprecated in 1.18)
396 * SpecialPage::file() (deprecated in 1.18)
397 * SpecialPage::func() (deprecated in 1.18)
398 * SpecialPage::getGroup() (deprecated in 1.18)
399 * SpecialPage::getPage() (deprecated in 1.18)
400 * SpecialPage::getPageByAlias() (deprecated in 1.18)
401 * SpecialPage::getLocalNameFor() (deprecated in 1.18)
402 * SpecialPage::getRegularPages() (deprecated in 1.18)
403 * SpecialPage::getRestrictedPages() (deprecated in 1.18)
404 * SpecialPage::getTitleForAlias() (deprecated in 1.18)
405 * SpecialPage::getUsablePages() (deprecated in 1.18)
406 * SpecialPage::includable() (deprecated in 1.18)
407 * SpecialPage::init()
408 * SpecialPage::initAliasList() (deprecated in 1.18)
409 * SpecialPage::initList() (deprecated in 1.18)
410 * SpecialPage::name() (deprecated in 1.18)
411 * SpecialPage::removePage() (deprecated in 1.18)
412 * SpecialPage::resolveAlias() (deprecated in 1.18)
413 * SpecialPage::resolveAliasWithSubpage() (deprecated in 1.18)
414 * SpecialPage::restriction() (deprecated in 1.18)
415 * SpecialPage::setGroup() (deprecated in 1.18)
416 * SpecialRecentChanges::feedSetup()
417 * SpecialRevisionDelete::extractBitField() (deprecated in 1.22)
418 * User::getPageRenderingHash() (deprecated in 1.17)
419 * WebRequest::getFileSize() (deprecated in 1.17)
420 * WebRequest::isPathInfoBad() (deprecated in 1.17)
421 * wfGenerateToken (deprecated in 1.20)
422 * wfStreamFile (deprecated in 1.19)
423 * wfUILang (deprecated in 1.18)
424 * WikiPage::createUpdates() (deprecated in 1.18)
425 * WikiPage::quickEdit() (deprecated in 1.18)
426 * WikiPage::useParserCache() (deprecated in 1.18)
427 * WikiPage::viewUpdates() (deprecated in 1.18)
428
429 ==== Removed globals ====
430 * $wgBetterDirectionality (deprecated in 1.18)
431
432 == Compatibility ==
433
434 MediaWiki 1.23 requires PHP 5.3.2 or later.
435
436 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
437 support for them is somewhat less mature. There is experimental support for
438 Oracle and Microsoft SQL Server.
439
440 The supported versions are:
441
442 * MySQL 5.0.2 or later
443 * PostgreSQL 8.3 or later
444 * SQLite 3.3.7 or later
445 * Oracle 9.0.1 or later
446 * Microsoft SQL Server 2005 (9.00.1399)
447
448 == Upgrading ==
449
450 1.23 has several database changes since 1.22, and will not work without schema
451 updates. Note that due to changes to some very large tables like the revision
452 table, the schema update may take quite long (minutes on a medium sized site,
453 many hours on a large site).
454
455 If upgrading from before 1.11, and you are using a wiki as a commons
456 repository, make sure that it is updated as well. Otherwise, errors may arise
457 due to database schema changes.
458
459 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
460 new database fields are filled with data.
461
462 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
463 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
464 with MediaWiki 1.21.
465
466 Don't forget to always back up your database before upgrading!
467
468 See the file UPGRADE for more detailed upgrade instructions.
469
470 For notes on 1.21.x and older releases, see HISTORY.
471
472 == Online documentation ==
473
474 Documentation for both end-users and site administrators is available on
475 MediaWiki.org, and is covered under the GNU Free Documentation License (except
476 for pages that explicitly state that their contents are in the public domain):
477
478 https://www.mediawiki.org/wiki/Documentation
479
480 == Mailing list ==
481
482 A mailing list is available for MediaWiki user support and discussion:
483
484 https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
485
486 A low-traffic announcements-only list is also available:
487
488 https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
489
490 It's highly recommended that you sign up for one of these lists if you're
491 going to run a public MediaWiki, so you can be notified of security fixes.
492
493 == IRC help ==
494
495 There's usually someone online in #mediawiki on irc.freenode.net.