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 ==== New external libraries ====
 119 * Added wikimedia/object-factory 1.0.0
 120
 121 ==== Removed and replaced external libraries ====
 122 * (T17845) The deprecated 'jquery.badge' module was removed.
 123 * The deprecated 'jquery.autoEllipsis' module was removed. Use the CSS
 124   text-overflow property instead.
 125 * The deprecated 'jquery.placeholder' module was removed.
 126 * The deprecated 'jquery.appear' module was removed. Use the
 127   'mediawiki.viewport' module instead.
 128 * mediawiki/at-ease was replaced with wikimedia/at-ease.
 129
 130 === Bug fixes in 1.31 ===
 131 * (T90902) Non-breaking space in header ID breaks anchor.
 132 * (T189375) CSSMin now allows quoted urls in `url()` syntax to start with a
 133   space.
 134 * (T2087, T10897, T87753, T174639) Whitespace created by category and language
 135   links is now stripped rather than leaving blank lines in odd places.
 136 * (T3780) Uploads with UTF-8 names now work on PHP7.1+ on Windows servers.
 137
 138 === Action API changes in 1.31 ===
 139 * (T185058) The 'name' value to tgprop for action=query&list=tags has been
 140   removed. It has never made a difference in the output, the name was always
 141   returned regardless.
 142 * The 'watch' and 'unwatch' parameters for action=move have been removed. They
 143   were deprecated and also accidentally nonfunctional since 1.17 in 2010. Use
 144   'watchlist' instead.
 145
 146 === Action API internal changes in 1.31 ===
 147 * ApiBase::getProfileDBTime, deprecated since 1.25, was removed.
 148 * ApiBase::getModuleProfileName, deprecated since 1.25, was removed.
 149 * ApiBase::getProfileTime, deprecated since 1.25, was removed.
 150
 151 === Languages updated in 1.31 ===
 152 MediaWiki supports over 350 languages. Many localisations are updated
 153 regularly. Below only new and removed languages are listed, as well as
 154 changes to languages because of Phabricator reports.
 155
 156 * (T180052) Mirandese (mwl) now supports gendered NS_USER/NS_USER_TALK.
 157 * (T182305) New language support: Nyungar (nys).
 158 * (T186359) New language support: Siberian Tatar [cебертатар] (sty).
 159 * (T186635) New language support: Guianan Creole (gcr).
 160 * (T186647) New language support: Kumyk [къумукъ] (kum).
 161 * (T187750) New language support: Spanish formal address (es-formal).
 162 * (T187824) New language support: Hungarian formal address (hu-formal).
 163 * (T189127) New language support: Gorontalo (gor).
 164
 165 === Breaking changes in 1.31 ===
 166 * MessageBlobStore::insertMessageBlob(), deprecated in 1.27, was removed.
 167 * The OutputPage class constructor now requires a context parameter.
 168   Instantiating without context was deprecated in 1.18.
 169 * The mw.page JavaScript singleton, deprecated in 1.30, was removed.
 170 * Article::getLastPurgeTimestamp(), WikiPage::getLastPurgeTimestamp(), and the
 171   related WikiPage::PURGE_* constants, deprecated in 1.29, were removed.
 172 * The Article::selectFields(), ::onArticleCreate(), ::onArticleDelete(), and
 173   ::onArticleEdit() methods, deprecated in 1.24, were removed.
 174 * Installer::locateExecutable() and ::locateExecutableInDefaultPaths() were
 175   removed. Use ExecutableFinder::findInDefaultPaths() instead.
 176 * The deprecated MW_DIFF_VERSION constant was removed.
 177   DifferenceEngine::MW_DIFF_VERSION should be used instead.
 178 * Due to significant refactoring, method ContribsPager::getUserCond() that had
 179   no access restriction has been removed.
 180 * The Block class will no longer accept usable-but-missing usernames for
 181   'byText' or ->setBlocker(). Callers should either ensure the blocker exists
 182   locally or use a new interwiki-format username like "iw>Example".
 183 * The following methods and constants from the WatchedItem class, which were
 184   deprecated in 1.27, have been removed:
 185   * WatchedItem::getTitle()
 186   * WatchedItem::fromUserTitle()
 187   * WatchedItem::addWatch()
 188   * WatchedItem::removeWatch()
 189   * WatchedItem::isWatched()
 190   * WatchedItem::duplicateEntries()
 191   * WatchedItem::IGNORE_USER_RIGHTS
 192   * WatchedItem::CHECK_USER_RIGHTS
 193   * WatchedItem::DEPRECATED_USAGE_TIMESTAMP
 194 * The $statementsOnOwnLine parameter of JavaScriptMinifier::minify was removed.
 195   $wgResourceLoaderMinifierStatementsOnOwnLine, the corresponding configuration
 196   variable, has been deprecated since 1.27 and was removed as well.
 197 * The $maxLineLength parameter of JavaScriptMinifier::minify was removed.
 198   $wgResourceLoaderMinifierMaxLineLength, the corresponding configuration
 199   variable, has been deprecated since 1.27 and was removed as well.
 200 * The HtmlFormatter class, deprecated in 1.27, was removed. The namespaced
 201   HtmlFormatter\HtmlFormatter class should be used instead.
 202 * The driver 'mysql' for MySQL, deprecated in MediaWiki 1.30, has been removed.
 203   The driver has been deprecated since PHP 5.5 and was removed in PHP 7.0. The
 204   default driver for MySQL has been 'mysqli' since MediaWiki 1.22.
 205 * The following properties of PreparedEdit were deprecated in 1.21 and have
 206   been removed:
 207   * PreparedEdit->newText
 208   * PreparedEdit->oldText
 209   * PreparedEdit->pst
 210 * ParserOutput objects which are generated using a non-default value for
 211   ParserOptions::setWrapOutputClass() can no longer be added to the parser
 212   cache.
 213 * The following deprecated methods from the OutputPage class have been removed:
 214   * OutputPage::addExtensionStyle(); deprecated in 1.27
 215   * OutputPage::getExtStyle(); deprecated in 1.27
 216   * OutputPage::setETag(); deprecated in 1.28 (obsolete no-op)
 217   * OutputPage::setSquidMaxage(); deprecated in 1.27
 218   * OutputPage::readOnlyPage(); deprecated in 1.25
 219   * OutputPage::rateLimited(); deprecated in 1.25
 220   * Additionally, the protected OutputPage::$mExtStyles array, only accessed
 221     through the above and with no known uses, was removed.
 222 * The no-op method Skin::showIPinHeader(), deprecated in 1.27, was removed.
 223 * The following variables and methods in EditPage, deprecated in MediaWiki 1.30,
 224   were removed:
 225   * $isCssJsSubpage — use ::isUserConfigPage()
 226   * $isCssSubpage — use ::isUserCssConfigPage()
 227   * $isJsSubpage — use ::isUserJsConfigPage()
 228   * $isWrongCaseCssJsPage – use ::isWrongCaseUserConfigPage()
 229   * ::getSummaryInput() – use ::getSummaryInputWidget()
 230   * ::getSummaryInputOOUI() – use ::getSummaryInputWidget()
 231   * ::getCheckboxes() – use ::getCheckboxesWidget() or
 232       ::getCheckboxesDefinition()
 233   * ::getCheckboxesOOUI() – use ::getCheckboxesWidget() or
 234       ::getCheckboxesDefinition()
 235 * ResourceLoaderModule::getPosition(), deprecated in 1.29, has been removed.
 236 * In User, the cookie-related methods which were wrappers for the functions on
 237   the response object, and were deprecated in 1.27, have been removed:
 238   * ::setCookie()
 239   * ::clearCookie()
 240   * ::setExtendedLoginCookie()
 241   Note that User::setCookies() remains, and is not deprecated.
 242 * Also in User, some auth-related methods which were deprecated in 1.27 have
 243   been removed:
 244   * ::getEditTokenTimestamp() – use MediaWiki\Session\Token::getTimestamp()
 245   * ::getPasswordFactory() – create a PasswordFactory directly
 246   * ::passwordChangeInputAttribs()
 247 * The global functions wfProfileIn and wfProfileOut, deprecated in 1.25, have
 248   been removed.
 249 * SpecialPageFactory::getList(), deprecated in 1.24, has been removed. You can
 250   use ::getNames() instead.
 251 * OpenSearch::getOpenSearchTemplate(), deprecated in 1.25, has been removed. You
 252   can use ApiOpenSearch::getOpenSearchTemplate() instead.
 253 * The global function wfBaseConvert, deprecated in 1.27, has been removed. Use
 254   Wikimedia\base_convert() directly.
 255 * Calling Database::begin() explicitly during an implicit transaction or when
 256   DBO_TRX is set results in an exception. Calling Database::commit() explicitly
 257   for an implicit transaction also results in an exception. Previously these
 258   were logged as errors. The startAtomic() and endAtomic() methods, or
 259   AtomicSectionUpdate should be used instead.
 260 * The global function wfOutputHandler() was removed, use the its replacement
 261   MediaWiki\OutputHandler::handle() instead. The global function was only
 262   sometimes defined. Its replacement is always available via the autoloader.
 263 * ChangeTags::listExtensionActivatedTags and ::listExtensionDefinedTags,
 264   deprecated in 1.28, have been removed. Use ::listSoftwareActivatedTags() and
 265   ::listSoftwareDefinedTags() instead.
 266 * Title::getTitleInvalidRegex(), deprecated in 1.25, has been removed. You can
 267   use MediaWikiTitleCodec::getTitleInvalidRegex() instead.
 268 * HTMLForm & VFormHTMLForm::isVForm(), deprecated in 1.25, have been removed.
 269 * The ProfileSection class, deprecated in 1.25 and unused, has been removed.
 270 * The ResourceLoaderGetLessVars hook, deprecated in 1.30, has been removed. Use
 271   ResourceLoaderModule::getLessVars() to expose local variables instead of
 272   global ones.
 273 * As part of work to modernise user-generated content clean-up, a config option
 274   and some methods related to HTML validity were removed without deprecation.
 275   The public methods MWTidy::checkErrors() and the path through which it was
 276   called, TidyDriverBase::validate(), are removed, as are the testing methods
 277   MediaWikiTestCase::assertValidHtmlSnippet() and ::assertValidHtmlDocument().
 278   The $wgValidateAllHtml configuration option is removed and will be ignored.
 279 * Execution of external programs using MediaWiki\Shell\Command now applies
 280   the RESTRICT_DEFAULT Firejail restriction by default.
 281 * The ResourceLoaderModule::getHashMtime() and ::getDefinitionMtime() methods,
 282   deprecated in 1.26, were removed.
 283 * The deprecated 'mediawiki.widgets.CategorySelector' module alias was removed.
 284   Use the 'mediawiki.widgets.CategoryMultiselectWidget' module directly.
 285
 286 === Deprecations in 1.31 ===
 287 * The Revision class was deprecated in favor of RevisionStore, BlobStore, and
 288   RevisionRecord and its subclasses.
 289 * The global function wfBCP47 is deprecated in favour of LanguageCode::bcp47.
 290 * The global function wfCountDown is now deprecated in favor of
 291   Maintenance::countDown.
 292 * Several methods for returning lists of fields to select from the database
 293   have been deprecated in favor of similar methods that also return the tables
 294   to select from and the join conditions for those tables.
 295   * Block::selectFields() → Block::getQueryInfo()
 296   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 297   * ArchivedFile::selectFields() → ArchivedFile::getQueryInfo()
 298   * LocalFile::selectFields() → LocalFile::getQueryInfo()
 299   * LocalFile::getCacheFields() with a prefix no longer works
 300   * LocalFile::getLazyCacheFields() with a prefix no longer works
 301   * OldLocalFile::selectFields() → OldLocalFile::getQueryInfo()
 302   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 303   * Revision::userJoinCond() → Revision::getQueryInfo( [ 'user' ] )
 304   * Revision::selectUserFields() → Revision::getQueryInfo( [ 'user' ] )
 305   * Revision::pageJoinCond() → Revision::getQueryInfo( [ 'page' ] )
 306   * Revision::selectPageFields() → Revision::getQueryInfo( [ 'page' ] )
 307   * Revision::selectTextFields() → Revision::getQueryInfo( [ 'text' ] )
 308   * Revision::selectFields() → Revision::getQueryInfo()
 309   * Revision::selectArchiveFields() → Revision::getArchiveQueryInfo()
 310   * User::selectFields() → User::getQueryInfo()
 311   * WikiPage::selectFields() → WikiPage::getQueryInfo()
 312 * Revision::setUserIdAndName() was deprecated.
 313 * Access to TitleValue class properties was deprecated, the relevant getters
 314   should be used instead.
 315 * DifferenceEngine::getDiffBodyCacheKey() is deprecated. Subclasses should
 316   override DifferenceEngine::getDiffBodyCacheKeyParams() instead.
 317 * Use of Maintenance::error( $err, $die ) to exit script was deprecated. Use
 318   Maintenance::fatalError() instead.
 319 * Passing a ParserOptions object to OutputPage::parserOptions() is deprecated.
 320 * The RevisionInsertComplete hook is now deprecated; use instead the hook
 321   RevisionRecordInserted. RevisionInsertComplete is still called, but the second
 322   and third parameter will always be null. Hard deprecation is scheduled for 1.32.
 323 * The following methods that get and set ParserOutput state are deprecated.
 324   Callers should use the new stateless $options parameter to
 325   ParserOutput::getText() instead.
 326   * ParserOptions::getEditSection()
 327   * ParserOptions::setEditSection()
 328   * ParserOutput::getEditSectionTokens()
 329   * ParserOutput::setEditSectionTokens()
 330   * ParserOutput::getTOCEnabled()
 331   * ParserOutput::setTOCEnabled()
 332   * OutputPage::enableSectionEditLinks()
 333   * OutputPage::sectionEditLinksEnabled()
 334   * The public ParserOutput state fields $mTOCEnabled and $mEditSectionTokens
 335     are also deprecated.
 336 * License::getLicenses has been deprecated; use License::getLines instead.
 337 * QuickTemplate::setRef() was deprecated in favour of QuickTemplate::set().
 338   Setting template variables by reference allowed violating the principle of
 339   data being immutable once added to the skin template. In practice, this method
 340   was not being used for that. Rather, setRef() existed as memory optimisation
 341   for PHP 4.
 342 * QuickTemplate::setTranslator() and MediaWikiI18N::set() were deprecated in
 343   favour of Skin::msg() parameters.
 344 * MediaWikiI18N::translate() was deprecated in favour of Skin::msg() or
 345   wfMessage().
 346 * Passing false to ParserOptions::setWrapOutputClass() is deprecated. Use the
 347   'unwrap' transform to ParserOutput::getText() instead.
 348 * \ObjectFactory (no namespace) is deprecated, the namespaced class
 349   \Wikimedia\ObjectFactory from the wikimedia/object-factory library should be
 350   used instead.
 351 * CommentStore::newKey is deprecated. Instead, get an instance from
 352   MediaWikiServices.
 353 * The following CommentStore methods have had their signatures changed to
 354   introduce a $key parameter, usage of the methods on instances retrieved from
 355   CommentStore::newKey will remain unchanged but deprecated:
 356   * CommentStore::getFields
 357   * CommentStore::getJoin
 358   * CommentStore::getComment
 359   * CommentStore::getCommentLegacy
 360   * CommentStore::insert
 361   * CommentStore::insertWithTemplate
 362 * The following methods in Title have been renamed, and the old ones are
 363   deprecated:
 364   * Title::getSkinFromCssJsSubpage – use ::getSkinFromConfigSubpage
 365   * Title::isCssOrJsPage – use ::isSiteConfigPage
 366   * Title::isCssJsSubpage – use ::isUserConfigPage
 367   * Title::isCssSubpage – use ::isUserCssConfigPage
 368   * Title::isJsSubpage – use ::isUserJsConfigPage
 369 * The following methods related to caching of half-parsed HTML were deprecated:
 370   * Parser::serializeHalfParsedText()
 371   * Parser::unserializeHalfParsedText()
 372   * Parser::isValidHalfParsedText()
 373   * StripState::getSubState()
 374   * StripState::merge()
 375 * The DeferredStringifier class is deprecated, use Message::listParam() instead.
 376 * The type string for the parameter $lang of DateFormatter::getInstance is
 377   deprecated.
 378 * Wikimedia\Rdbms\SavepointPostgres is deprecated.
 379 * The DO_MAINTENANCE constant is deprecated. RUN_MAINTENANCE_IF_MAIN should be
 380   used instead.
 381 * The function wfShellWikiCmd() has been deprecated, use
 382   MediaWiki\Shell::makeScriptCommand().
 383 === Other changes in 1.31 ===
 384 * Browser support for Internet Explorer 10 was lowered from Grade A to Grade C.
 385 * Browser support for Opera 12 and older was dropped entirely. Opera 15+
 386   continues at Grade A.
 387 * Multi-content-revision capability was introduced into the storage layer. See
 388   <https://mediawiki.org/wiki/Requests_for_comment/Multi-Content_Revisions>.
 389 * The "free" CSS class is now only applied to unbracketed URLs in wikitext.
 390   Links written using square brackets will get the class "text" not "free".
 391 * RFC 157418: Whitespace is trimmed from wikitext headings, wikitext list items,
 392   wikitext table captions, wikitext table headings, wikitext table cells. HTML
 393   headings, HTML list items, HTML table captions, HTML table headings, HTML
 394   table cells will not have this trimming behavior.
 395
 396 == Compatibility ==
 397 MediaWiki 1.31 requires PHP 7.0.0 or later. Although HHVM 3.18.5 or later is
 398 supported, it is generally advised to use PHP 7.0.0 or later for long term
 399 support.
 400
 401 MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
 402 but support for them is somewhat less mature. There is experimental support for
 403 Oracle and Microsoft SQL Server.
 404
 405 The supported versions are:
 406
 407 * MySQL 5.5.8 or later
 408 * PostgreSQL 9.2 or later
 409 * SQLite 3.3.7 or later
 410 * Oracle 9.0.1 or later
 411 * Microsoft SQL Server 2005 (9.00.1399)
 412
 413 == Upgrading ==
 414 1.31 has several database changes since 1.30, and will not work without schema
 415 updates. Note that due to changes to some very large tables like the revision
 416 table, the schema update may take quite long (minutes on a medium sized site,
 417 many hours on a large site).
 418
 419 Don't forget to always back up your database before upgrading!
 420
 421 See the file UPGRADE for more detailed upgrade instructions, including
 422 important information when upgrading from versions prior to 1.11.
 423
 424 For notes on 1.30.x and older releases, see HISTORY.
 425
 426 == Online documentation ==
 427 Documentation for both end-users and site administrators is available on
 428 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 429 for pages that explicitly state that their contents are in the public domain):
 430
 431        https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation
 432
 433 == Mailing list ==
 434 A mailing list is available for MediaWiki user support and discussion:
 435
 436        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 437
 438 A low-traffic announcements-only list is also available:
 439
 440        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 441
 442 It's highly recommended that you sign up for one of these lists if you're
 443 going to run a public MediaWiki, so you can be notified of security fixes.
 444
 445 == IRC help ==
 446 There's usually someone online in #mediawiki on irc.freenode.net.