RELEASE-NOTES-1.31

   1 == MediaWiki 1.31 ==
   2
   3 THIS IS NOT A RELEASE YET
   4
   5 MediaWiki 1.31 is an alpha-quality branch and is not recommended for use in
   6 production.
   7
   8 === Configuration changes in 1.31 ===
   9 * $wgEnableAPI and $wgEnableWriteAPI are now deprecated and will be removed in
  10   a future version. The API is now considered to be stable, secure and
  11   essential.
  12 * $wgUsejQueryThree was removed, as it is now the default. This was documented
  13   as a temporary variable during the migration period, deprecated since 1.29.
  14 * $wgLogoHD has been updated to support svg images and uses $wgLogo where
  15   possible for fallback images such as png.
  16 * (T44246) $wgFilterLogTypes will no longer ignore 'patrol' when user does not
  17   have the right to mark things patrolled.
  18 * Wikis that contain imported revisions or CentralAuth global blocks should run
  19   maintenance/cleanupUsersWithNoId.php.
  20 * The configuration settings $wgResourceLoaderMinifierStatementsOnOwnLine and
  21   $wgResourceLoaderMinifierMaxLineLength, deprecated since 1.27, were removed.
  22 * (T180921) $wgReferrerPolicy now supports having fallbacks for browsers that
  23   are not using the latest version of the Referrer Policy specification.
  24 * $wgFragmentMode is now set to [ 'legacy', 'html5' ] by default. This is a
  25   first step of migration to human-readable section IDs that will later result
  26   in 'html5' being the default mode.
  27 * CACHE_ACCEL now only supports APC(u) or WinCache. XCache support was removed
  28   as upstream is inactive and has no plans to move to PHP 7.
  29 * The old CategorizedRecentChanges feature, including its related configuration
  30   option $wgAllowCategorizedRecentChanges, has been removed.
  31 * (T188472) The 'comma' value for $wgArticleCountMethod is no longer supported
  32   for performance reasons, and installations with this setting will now work as
  33   if it was configured with 'any'.
  34 * (T185753) MediaWiki now defaults to using RemexHtml to tidy up user input,
  35   rather than being off by default. If you wish to disable HTML tidying
  36   entirely, set $wgTidyConfig to null; if you wish to use the old, deprecated
  37   Tidy external binary, both set $wgTidyConfig to null and $wgUseTidy to true.
  38 * $wgLogAutopatrol now defaults to false instead of true.
  39 * $wgValidateAllHtml was removed and will be ignored.
  40 * $wgScriptExtension, deprecated and ignored since 1.25, was removed. See the
  41   1.25 release notes for more information.
  42 * $wgUseAjax is now marked as deprecated, just like the deprecated AJAX
  43   framework that it enables. Some extensions mistakenly used this to check
  44   whether any AJAX functionality at all should be enabled, further making this
  45   problematic to retain.
  46
  47 === New features in 1.31 ===
  48 * (T76554) User sub-pages named ….json are now protected in the same way that
  49   ….js and ….css pages are, so that configuration options can safely be placed
  50   there.
  51 * Wikimedia\Rdbms\IDatabase->select() and similar methods now support joins
  52   with parentheses for grouping.
  53 * As a first pass in standardizing dialog boxes across the MediaWiki product,
  54   Html class now provides helper methods for messageBox, successBox, errorBox
  55   and warningBox generation.
  56 * (T9240) Imports will now record unknown (and, optionally, known) usernames in
  57   a format like "iw>Example".
  58 * (T20209) Linker (used on history pages, log pages, and so on) will display
  59   usernames formed like "iw>Example" as interwiki links, as if by wikitext like
  60   [[iw:User:Example|iw>Example]].
  61 * (T111605) The 'ImportHandleUnknownUser' hook allows extensions to auto-create
  62   users during an import.
  63 * Added a hook, ParserOutputPostCacheTransform, to allow extensions to affect
  64   the ParserOutput::getText() post-cache transformations.
  65 * Added a hook, UploadForm:getInitialPageText, to allow extensions to alter the
  66   initial page text for file uploads.
  67 * (T181651) The info page for File pages now displays the file's base-16 SHA1
  68   hash value in the table of basic information.
  69 * Style tags with a 'data-mw-deduplicate' attribute will be deduplicated as a
  70   ParserOutput::getText() post-cache transformation. This may be disabled by
  71   passing 'deduplicateStyles' => false to that method.
  72 * The identity of the logged-in or IP "actor" for logged actions is being moved
  73   into a new actor table, with the rows in tables such as revision and logging
  74   referring to the actor ID instead of storing the user ID and name/IP in
  75   every row.
  76   * This is currently gated by $wgActorTableSchemaMigrationStage. Most wikis
  77     can set this to MIGRATION_NEW and run maintenance/migrateActors.php as
  78     soon as any necessary extensions are updated.
  79   * Most code accessing rows for logged actions from the database should use
  80     the relevant getQueryInfo() methods to get the information needed to build
  81     the SQL query. The ActorMigration class may also be used to get feature
  82         -flagged information needed to access actor-related fields during the
  83         migration period.
  84 * Added Wikimedia\Rdbms\IDatabase::cancelAtomic(), to roll back an atomic
  85   section without having to roll back the whole transaction.
  86 * Wikimedia\Rdbms\IDatabase::doAtomicSection(), non-native ::insertSelect(),
  87   and non-MySQL ::replace() and ::upsert() no longer roll back the whole
  88   transaction on failure.
  89 * (T189785) Added a monthly heartbeat ping to the pingback feature.
  90 * The CLI installer (maintenance/install.php) learned to detect and include
  91   extensions. Pass --with-extensions to enable that feature.
  92 * (T184791) rc_patrolled now has three states: "0" for unpatrolled,
  93   "1" for manually patrolled and "2" for autopatrolled actions.
  94 * Extensions can now set their type to "editor" if they provide an editor or
  95   enhance the editing experience.
  96 * Extensions can use a PSR-4 autoloader by setting an "AutoloadNamespaces"
  97   property in extension.json. See the documentation at
  98   <https://mediawiki.org/wiki/Manual:Extension.json/Schema#AutoloadNamespaces>
  99   for more details and an example.
 100 * (T19099) Tabs which link to pages that don't exist (like those to uncreated
 101   discussion pages) now have a tooltip to indicate state, not just colour.
 102
 103 === External library changes in 1.31 ===
 104
 105 ==== Upgraded external libraries ====
 106 * Updated jquery.chosen from v0.9.14 to v1.8.2.
 107 * Updated composer/spdx-licenses from 1.1.4 to 1.3.0 (development dependency).
 108 * Updated nikic/php-parser from 2.1.0 to 3.1.3 (development dependency).
 109 * Updated wikimedia/ip-set from 1.1.0 to 1.2.0.
 110 * Updated wikimedia/relpath from 2.0.0 to 2.1.1.
 111 * Updated wikimedia/running-stat from 1.1.0 to 1.2.0.
 112 * Updated wikimedia/wrappedstring from 2.2.0 to 2.3.0.
 113 * Updated mediawiki/at-ease from 1.1.0 to 1.2.0.
 114 * Updated wikimedia/php-session-serializer from 1.0.4 to 1.0.6.
 115 * Updated wikimedia/remex-html from 1.0.2 to 1.0.3.
 116 * Updated wikimedia/html-formatter from 1.0.1 to 1.0.2.
 117 * …
 118
 119 ==== New external libraries ====
 120 * Added wikimedia/object-factory 1.0.0
 121 * …
 122
 123 ==== Removed and replaced external libraries ====
 124 * (T17845) The deprecated 'jquery.badge' module was removed.
 125 * The deprecated 'jquery.autoEllipsis' module was removed. Use the CSS
 126   text-overflow property instead.
 127 * The deprecated 'jquery.placeholder' module was removed.
 128 * The deprecated 'jquery.appear' module was removed. Use the
 129   'mediawiki.viewport' module instead.
 130 * mediawiki/at-ease was replaced with wikimedia/at-ease.
 131
 132 === Bug fixes in 1.31 ===
 133 * (T90902) Non-breaking space in header ID breaks anchor.
 134 * (T189375) CSSMin now allows quoted urls in `url()` syntax to start with a
 135   space.
 136 * (T2087, T10897, T87753, T174639) Whitespace created by category and language
 137   links is now stripped rather than leaving blank lines in odd places.
 138
 139 === Action API changes in 1.31 ===
 140 * (T185058) The 'name' value to tgprop for action=query&list=tags has been
 141   removed. It has never made a difference in the output, the name was always
 142   returned regardless.
 143 * The 'watch' and 'unwatch' parameters for action=move have been removed. They
 144   were deprecated and also accidentally nonfunctional since 1.17 in 2010. Use
 145   'watchlist' instead.
 146
 147 === Action API internal changes in 1.31 ===
 148 * ApiBase::getProfileDBTime, deprecated since 1.25,
 149  was removed
 150 * ApiBase::getModuleProfileName, deprecated since 1.25, was removed
 151 * ApiBase::getProfileTime, deprecated since 1.25, was removed
 152
 153 === Languages updated in 1.31 ===
 154 MediaWiki supports over 350 languages. Many localisations are updated
 155 regularly. Below only new and removed languages are listed, as well as
 156 changes to languages because of Phabricator reports.
 157 * (T180052) Mirandese (mwl) now supports gendered NS_USER/NS_USER_TALK.
 158 * (T182305) New language support: Nyungar (nys).
 159 * (T186359) New language support: Siberian Tatar [cебертатар] (sty).
 160 * (T186635) New language support: Guianan Creole (gcr).
 161 * (T186647) New language support: Kumyk [къумукъ] (kum).
 162 * (T187750) New language support: Spanish formal address (es-formal).
 163 * (T187824) New language support: Hungarian formal address (hu-formal).
 164 * (T189127) New language support: Gorontalo (gor).
 165
 166 === Breaking changes in 1.31 ===
 167 * MessageBlobStore::insertMessageBlob(), deprecated in 1.27, was removed.
 168 * The OutputPage class constructor now requires a context parameter.
 169   Instantiating without context was deprecated in 1.18.
 170 * The mw.page JavaScript singleton, deprecated in 1.30, was removed.
 171 * Article::getLastPurgeTimestamp(), WikiPage::getLastPurgeTimestamp(), and the
 172   related WikiPage::PURGE_* constants, deprecated in 1.29, were removed.
 173 * The Article::selectFields(), ::onArticleCreate(), ::onArticleDelete(), and
 174   ::onArticleEdit() methods, deprecated in 1.24, were removed.
 175 * Installer::locateExecutable() and ::locateExecutableInDefaultPaths() were
 176   removed. Use ExecutableFinder::findInDefaultPaths() instead.
 177 * The deprecated MW_DIFF_VERSION constant was removed.
 178   DifferenceEngine::MW_DIFF_VERSION should be used instead.
 179 * Due to significant refactoring, method ContribsPager::getUserCond() that had
 180   no access restriction has been removed.
 181 * The Block class will no longer accept usable-but-missing usernames for
 182   'byText' or ->setBlocker(). Callers should either ensure the blocker exists
 183   locally or use a new interwiki-format username like "iw>Example".
 184 * The following methods and constants from the WatchedItem class, which were
 185   deprecated in 1.27, have been removed:
 186   * WatchedItem::getTitle()
 187   * WatchedItem::fromUserTitle()
 188   * WatchedItem::addWatch()
 189   * WatchedItem::removeWatch()
 190   * WatchedItem::isWatched()
 191   * WatchedItem::duplicateEntries()
 192   * WatchedItem::IGNORE_USER_RIGHTS
 193   * WatchedItem::CHECK_USER_RIGHTS
 194   * WatchedItem::DEPRECATED_USAGE_TIMESTAMP
 195 * The $statementsOnOwnLine parameter of JavaScriptMinifier::minify was removed.
 196   $wgResourceLoaderMinifierStatementsOnOwnLine, the corresponding configuration
 197   variable, has been deprecated since 1.27 and was removed as well.
 198 * The $maxLineLength parameter of JavaScriptMinifier::minify was removed.
 199   $wgResourceLoaderMinifierMaxLineLength, the corresponding configuration
 200   variable, has been deprecated since 1.27 and was removed as well.
 201 * The HtmlFormatter class, deprecated in 1.27, was removed. The namespaced
 202   HtmlFormatter\HtmlFormatter class should be used instead.
 203 * The driver 'mysql' for MySQL, deprecated in MediaWiki 1.30, has been removed.
 204   The driver has been deprecated since PHP 5.5 and was removed in PHP 7.0. The
 205   default driver for MySQL has been 'mysqli' since MediaWiki 1.22.
 206 * The following properties of PreparedEdit were deprecated in 1.21 and have
 207   been removed:
 208   * PreparedEdit->newText
 209   * PreparedEdit->oldText
 210   * PreparedEdit->pst
 211 * ParserOutput objects which are generated using a non-default value for
 212   ParserOptions::setWrapOutputClass() can no longer be added to the parser
 213   cache.
 214 * The following deprecated methods from the OutputPage class have been removed:
 215   * OutputPage::addExtensionStyle(); deprecated in 1.27
 216   * OutputPage::getExtStyle(); deprecated in 1.27
 217   * OutputPage::setETag(); deprecated in 1.28 (obsolete no-op)
 218   * OutputPage::setSquidMaxage(); deprecated in 1.27
 219   * OutputPage::readOnlyPage(); deprecated in 1.25
 220   * OutputPage::rateLimited(); deprecated in 1.25
 221   * Additionally, the protected OutputPage::$mExtStyles array, only accessed
 222     through the above and with no known uses, was removed.
 223 * The no-op method Skin::showIPinHeader(), deprecated in 1.27, was removed.
 224 * The following variables and methods in EditPage, deprecated in MediaWiki 1.30,
 225   were removed:
 226   * $isCssJsSubpage — use ::isUserConfigPage()
 227   * $isCssSubpage — use ::isUserCssConfigPage()
 228   * $isJsSubpage — use ::isUserJsConfigPage()
 229   * $isWrongCaseCssJsPage – use ::isWrongCaseUserConfigPage()
 230   * ::getSummaryInput() – use ::getSummaryInputWidget()
 231   * ::getSummaryInputOOUI() – use ::getSummaryInputWidget()
 232   * ::getCheckboxes() – use ::getCheckboxesWidget() or
 233       ::getCheckboxesDefinition()
 234   * ::getCheckboxesOOUI() – use ::getCheckboxesWidget() or
 235       ::getCheckboxesDefinition()
 236 * ResourceLoaderModule::getPosition(), deprecated in 1.29, has been removed.
 237 * In User, the cookie-related methods which were wrappers for the functions on
 238   the response object, and were deprecated in 1.27, have been removed:
 239   * ::setCookie()
 240   * ::clearCookie()
 241   * ::setExtendedLoginCookie()
 242   Note that User::setCookies() remains, and is not deprecated.
 243 * Also in User, some auth-related methods which were deprecated in 1.27 have
 244   been removed:
 245   * ::getEditTokenTimestamp() – use MediaWiki\Session\Token::getTimestamp()
 246   * ::getPasswordFactory() – create a PasswordFactory directly
 247   * ::passwordChangeInputAttribs()
 248 * The global functions wfProfileIn and wfProfileOut, deprecated in 1.25, have
 249   been removed.
 250 * SpecialPageFactory::getList(), deprecated in 1.24, has been removed. You can
 251   use ::getNames() instead.
 252 * OpenSearch::getOpenSearchTemplate(), deprecated in 1.25, has been removed. You
 253   can use ApiOpenSearch::getOpenSearchTemplate() instead.
 254 * The global function wfBaseConvert, deprecated in 1.27, has been removed. Use
 255   Wikimedia\base_convert() directly.
 256 * Calling Database::begin() explicitly during an implicit transaction or when
 257   DBO_TRX is set results in an exception. Calling Database::commit() explicitly
 258   for an implicit transaction also results in an exception. Previously these
 259   were logged as errors. The startAtomic() and endAtomic() methods, or
 260   AtomicSectionUpdate should be used instead.
 261 * The global function wfOutputHandler() was removed, use the its replacement
 262   MediaWiki\OutputHandler::handle() instead. The global function was only
 263   sometimes defined. Its replacement is always available via the autoloader.
 264 * ChangeTags::listExtensionActivatedTags and ::listExtensionDefinedTags,
 265   deprecated in 1.28, have been removed. Use ::listSoftwareActivatedTags() and
 266   ::listSoftwareDefinedTags() instead.
 267 * Title::getTitleInvalidRegex(), deprecated in 1.25, has been removed. You can
 268   use MediaWikiTitleCodec::getTitleInvalidRegex() instead.
 269 * HTMLForm & VFormHTMLForm::isVForm(), deprecated in 1.25, have been removed.
 270 * The ProfileSection class, deprecated in 1.25 and unused, has been removed.
 271 * The ResourceLoaderGetLessVars hook, deprecated in 1.30, has been removed. Use
 272   ResourceLoaderModule::getLessVars() to expose local variables instead of
 273   global ones.
 274 * As part of work to modernise user-generated content clean-up, a config option
 275   and some methods related to HTML validity were removed without deprecation.
 276   The public methods MWTidy::checkErrors() and the path through which it was
 277   called, TidyDriverBase::validate(), are removed, as are the testing methods
 278   MediaWikiTestCase::assertValidHtmlSnippet() and ::assertValidHtmlDocument().
 279   The $wgValidateAllHtml configuration option is removed and will be ignored.
 280 * Execution of external programs using MediaWiki\Shell\Command now applies
 281   the RESTRICT_DEFAULT Firejail restriction by default.
 282 * The ResourceLoaderModule::getHashMtime() and ::getDefinitionMtime() methods,
 283   deprecated in 1.26, were removed.
 284 * The deprecated 'mediawiki.widgets.CategorySelector' module alias was removed.
 285   Use the 'mediawiki.widgets.CategoryMultiselectWidget' module directly.
 286
 287 === Deprecations in 1.31 ===
 288 * The Revision class was deprecated in favor of RevisionStore, BlobStore, and
 289   RevisionRecord and its subclasses.
 290 * The global function wfBCP47 is deprecated in favour of LanguageCode::bcp47.
 291 * The global function wfCountDown is now deprecated in favor of
 292   Maintenance::countDown.
 293 * Several methods for returning lists of fields to select from the database
 294   have been deprecated in favor of similar methods that also return the tables
 295   to select from and the join conditions for those tables.
 296   * Block::selectFields() → Block::getQueryInfo()
 297   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 298   * ArchivedFile::selectFields() → ArchivedFile::getQueryInfo()
 299   * LocalFile::selectFields() → LocalFile::getQueryInfo()
 300   * LocalFile::getCacheFields() with a prefix no longer works
 301   * LocalFile::getLazyCacheFields() with a prefix no longer works
 302   * OldLocalFile::selectFields() → OldLocalFile::getQueryInfo()
 303   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 304   * Revision::userJoinCond() → Revision::getQueryInfo( [ 'user' ] )
 305   * Revision::selectUserFields() → Revision::getQueryInfo( [ 'user' ] )
 306   * Revision::pageJoinCond() → Revision::getQueryInfo( [ 'page' ] )
 307   * Revision::selectPageFields() → Revision::getQueryInfo( [ 'page' ] )
 308   * Revision::selectTextFields() → Revision::getQueryInfo( [ 'text' ] )
 309   * Revision::selectFields() → Revision::getQueryInfo()
 310   * Revision::selectArchiveFields() → Revision::getArchiveQueryInfo()
 311   * User::selectFields() → User::getQueryInfo()
 312   * WikiPage::selectFields() → WikiPage::getQueryInfo()
 313 * Revision::setUserIdAndName() was deprecated.
 314 * Access to TitleValue class properties was deprecated, the relevant getters
 315   should be used instead.
 316 * DifferenceEngine::getDiffBodyCacheKey() is deprecated. Subclasses should
 317   override DifferenceEngine::getDiffBodyCacheKeyParams() instead.
 318 * Use of Maintenance::error( $err, $die ) to exit script was deprecated. Use
 319   Maintenance::fatalError() instead.
 320 * Passing a ParserOptions object to OutputPage::parserOptions() is deprecated.
 321 * The RevisionInsertComplete hook is now deprecated; use instead the hook
 322   RevisionRecordInserted. RevisionInsertComplete is still called, but the second
 323   and third parameter will always be null. Hard deprecation is scheduled for 1.32.
 324 * The following methods that get and set ParserOutput state are deprecated.
 325   Callers should use the new stateless $options parameter to
 326   ParserOutput::getText() instead.
 327   * ParserOptions::getEditSection()
 328   * ParserOptions::setEditSection()
 329   * ParserOutput::getEditSectionTokens()
 330   * ParserOutput::setEditSectionTokens()
 331   * ParserOutput::getTOCEnabled()
 332   * ParserOutput::setTOCEnabled()
 333   * OutputPage::enableSectionEditLinks()
 334   * OutputPage::sectionEditLinksEnabled()
 335   * The public ParserOutput state fields $mTOCEnabled and $mEditSectionTokens
 336     are also deprecated.
 337 * License::getLicenses has been deprecated; use License::getLines instead.
 338 * QuickTemplate::setRef() was deprecated in favour of QuickTemplate::set().
 339   Setting template variables by reference allowed violating the principle of
 340   data being immutable once added to the skin template. In practice, this method
 341   was not being used for that. Rather, setRef() existed as memory optimisation
 342   for PHP 4.
 343 * QuickTemplate::setTranslator() and MediaWikiI18N::set() were deprecated in
 344   favour of Skin::msg() parameters.
 345 * MediaWikiI18N::translate() was deprecated in favour of Skin::msg() or
 346   wfMessage().
 347 * Passing false to ParserOptions::setWrapOutputClass() is deprecated. Use the
 348   'unwrap' transform to ParserOutput::getText() instead.
 349 * \ObjectFactory (no namespace) is deprecated, the namespaced class
 350   \Wikimedia\ObjectFactory from the wikimedia/object-factory library should be
 351   used instead.
 352 * CommentStore::newKey is deprecated. Instead, get an instance from
 353   MediaWikiServices.
 354 * The following CommentStore methods have had their signatures changed to
 355   introduce a $key parameter, usage of the methods on instances retrieved from
 356   CommentStore::newKey will remain unchanged but deprecated:
 357   * CommentStore::getFields
 358   * CommentStore::getJoin
 359   * CommentStore::getComment
 360   * CommentStore::getCommentLegacy
 361   * CommentStore::insert
 362   * CommentStore::insertWithTemplate
 363 * The following methods in Title have been renamed, and the old ones are
 364   deprecated:
 365   * Title::getSkinFromCssJsSubpage – use ::getSkinFromConfigSubpage
 366   * Title::isCssOrJsPage – use ::isSiteConfigPage
 367   * Title::isCssJsSubpage – use ::isUserConfigPage
 368   * Title::isCssSubpage – use ::isUserCssConfigPage
 369   * Title::isJsSubpage – use ::isUserJsConfigPage
 370 * The following methods related to caching of half-parsed HTML were deprecated:
 371   * Parser::serializeHalfParsedText()
 372   * Parser::unserializeHalfParsedText()
 373   * Parser::isValidHalfParsedText()
 374   * StripState::getSubState()
 375   * StripState::merge()
 376 * The DeferredStringifier class is deprecated, use Message::listParam() instead.
 377 * The type string for the parameter $lang of DateFormatter::getInstance is
 378   deprecated.
 379 * Wikimedia\Rdbms\SavepointPostgres is deprecated.
 380 * The DO_MAINTENANCE constant is deprecated. RUN_MAINTENANCE_IF_MAIN should be
 381   used instead.
 382 * The function wfShellWikiCmd() has been deprecated, use
 383   MediaWiki\Shell::makeScriptCommand().
 384 === Other changes in 1.31 ===
 385 * Browser support for Internet Explorer 10 was lowered from Grade A to Grade C.
 386 * Browser support for Opera 12 and older was dropped entirely. Opera 15+
 387   continues at Grade A.
 388 * Multi-content-revision capability was introduced into the storage layer. See
 389   <https://mediawiki.org/wiki/Requests_for_comment/Multi-Content_Revisions>.
 390 * The "free" CSS class is now only applied to unbracketed URLs in wikitext.
 391   Links written using square brackets will get the class "text" not "free".
 392 * RFC 157418: Whitespace is trimmed from wikitext headings, wikitext list items,
 393   wikitext table captions, wikitext table headings, wikitext table cells. HTML
 394   headings, HTML list items, HTML table captions, HTML table headings, HTML
 395   table cells will not have this trimming behavior.
 396
 397 == Compatibility ==
 398 MediaWiki 1.31 requires PHP 7.0.0 or later. Although HHVM 3.18.5 or later is
 399 supported, it is generally advised to use PHP 7.0.0 or later for long term
 400 support.
 401
 402 MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
 403 but support for them is somewhat less mature. There is experimental support for
 404 Oracle and Microsoft SQL Server.
 405
 406 The supported versions are:
 407
 408 * MySQL 5.5.8 or later
 409 * PostgreSQL 9.2 or later
 410 * SQLite 3.3.7 or later
 411 * Oracle 9.0.1 or later
 412 * Microsoft SQL Server 2005 (9.00.1399)
 413
 414 == Upgrading ==
 415 1.31 has several database changes since 1.30, and will not work without schema
 416 updates. Note that due to changes to some very large tables like the revision
 417 table, the schema update may take quite long (minutes on a medium sized site,
 418 many hours on a large site).
 419
 420 Don't forget to always back up your database before upgrading!
 421
 422 See the file UPGRADE for more detailed upgrade instructions, including
 423 important information when upgrading from versions prior to 1.11.
 424
 425 For notes on 1.30.x and older releases, see HISTORY.
 426
 427 == Online documentation ==
 428 Documentation for both end-users and site administrators is available on
 429 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 430 for pages that explicitly state that their contents are in the public domain):
 431
 432        https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation
 433
 434 == Mailing list ==
 435 A mailing list is available for MediaWiki user support and discussion:
 436
 437        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 438
 439 A low-traffic announcements-only list is also available:
 440
 441        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 442
 443 It's highly recommended that you sign up for one of these lists if you're
 444 going to run a public MediaWiki, so you can be notified of security fixes.
 445
 446 == IRC help ==
 447 There's usually someone online in #mediawiki on irc.freenode.net.