RELEASE-NOTES-1.34

   1 = MediaWiki 1.34 =
   2
   3 == MediaWiki 1.34.0-PRERELEASE ==
   4
   5 THIS IS NOT A RELEASE YET
   6
   7 MediaWiki 1.34 is an alpha-quality development branch, and is not recommended
   8 for use in production.
   9
  10 == Upgrading notes for 1.34 ==
  11 1.34 has several database changes since 1.33, and will not work without schema
  12 updates. Note that due to changes to some very large tables like the revision
  13 table, the schema update may take quite long (minutes on a medium sized site,
  14 many hours on a large site).
  15
  16 Don't forget to always back up your database before upgrading!
  17
  18 See the file UPGRADE for more detailed upgrade instructions, including
  19 important information when upgrading from versions prior to 1.11.
  20
  21 Some specific notes for MediaWiki 1.34 upgrades are below:
  22
  23 * …
  24
  25 For notes on 1.33.x and older releases, see HISTORY.
  26
  27 === Configuration changes for system administrators in 1.34 ===
  28
  29 ==== New configuration ====
  30 * $wgAllowExternalReqID (T201409) - This configuration setting controls whether
  31   Mediawiki accepts the request ID set by the incoming request via the
  32   `X-Request-Id` header. If set to `true`, that value will be used throughout
  33   the code as the request identificator. Otherwise, the sent header will be
  34   ignored and the request ID will either be taken from Apache's mod_unique
  35   module or will be generated by Mediawiki itself (depending on the set-up).
  36 * $wgEnableSpecialMute (T218265) - This configuration controls whether
  37   Special:Mute is available and whether to include a link to it on emails
  38   originating from Special:Email.
  39
  40 ==== Changed configuration ====
  41 * $wgUseCdn, $wgCdnServers, $wgCdnServersNoPurge, and $wgCdnMaxAge – These four
  42   CDN-related config variables have been renamed from being specific to Squid –
  43   they were previously $wgUseSquid, $wgSquidServers, $wgSquidServersNoPurge, and
  44   $wgSquidMaxage respectively. This aligns them with the related existing
  45   variable $wgCdnMaxageLagged. The previous configuration variable names are
  46   deprecated, but will be used as the fall back if they are still set.
  47   Note that wgSquidPurgeUseHostHeader has not been renamed, as it is deprecated.
  48 * (T27707) File type checks for image uploads have been relaxed to allow files
  49   containing some HTML markup in metadata. As a result, the $wgAllowTitlesInSVG
  50   setting is no longer applied and is now always true. Note that MSIE 7 may
  51   still be able to misinterpret certain malformed PNG files as HTML.
  52 * Introduced $wgVerifyMimeTypeIE to allow disabling the MSIE 6/7 file type
  53   detection heuristic on upload, which is more conservative than the checks
  54   that were changed above.
  55 * $wgSkipSkin — Setting this instead of $wgSkipSkins, deprecated in 1.23, is now
  56   hard-deprecated.
  57 * $wgLocalInterwiki — Setting this instead of $wgLocalInterwikis, deprecated in
  58   1.23, is now hard-deprecated.
  59 * $wgProfileOnly — Setting this, deprecated in 1.23, is now hard-deprecated.
  60   Instead, set the log file in $wgDebugLogGroups['profileoutput'].
  61 * …
  62
  63 ==== Removed configuration ====
  64 * $wgWikiDiff2MovedParagraphDetectionCutoff — If you still want a custom change
  65   size threshold, please specify in php.ini, using the configuration variable
  66   wikidiff2.moved_paragraph_detection_cutoff.
  67 * $wgDebugPrintHttpHeaders - The default of including HTTP headers in the
  68   debug log channel is no longer configurable. The debug log itself remains
  69   configurable via $wgDebugLogFile.
  70
  71 === New user-facing features in 1.34 ===
  72 * Special:Mute has been added as a quick way for users to block unwanted emails
  73   from other users originating from Special:EmailUser.
  74
  75 === New developer features in 1.34 ===
  76 * The ImgAuthModifyHeaders hook was added to img_auth.php to allow modification
  77   of headers in private wikis.
  78 * Language::formatTimePeriod now supports the new 'avoidhours' option to output
  79   strings like "5 days ago" instead of "5 days 13 hours ago".
  80 * (T220163) Added SpecialMuteModifyFormFields hook to allow extensions
  81   to add fields to Special:Mute.
  82
  83 === External library changes in 1.34 ===
  84
  85 ==== New external libraries ====
  86 * …
  87
  88 ==== Changed external libraries ====
  89 * Updated Mustache from 1.0.0 to v3.0.1.
  90 * Updated OOUI from v0.31.3 to v0.33.2.
  91 * Updated composer/semver from 1.4.2 to 1.5.0.
  92 * Updated composer/spdx-licenses from 1.4.0 to 1.5.1 (dev-only).
  93 * Updated mediawiki/codesniffer from 25.0.0 to 26.0.0 (dev-only).
  94 * Updated cssjanus/cssjanus from 1.2.1 to 1.3.0.
  95 * Updated wikimedia/at-ease from 1.2.0 to 2.0.0.
  96 * Updated wikimedia/remex-html from 2.0.1 to 2.0.3.
  97 * Updated monolog/monolog from 1.22.1 to 1.24.0 (dev-only).
  98 * Updated wikimedia/object-factory from 1.0.0 to 2.1.0.
  99 * Updated wikimedia/timestamp from 2.2.0 to 3.0.0.
 100 * Updated wikimedia/xmp-reader from 0.6.2 to 0.6.3.
 101 * Updated mediawiki/mediawiki-phan-config from 0.6.0 to 0.6.1 (dev-only).
 102 * …
 103
 104 ==== Removed external libraries ====
 105 * The jquery.async module, deprecated in 1.33, was removed.
 106 * …
 107
 108 === Bug fixes in 1.34 ===
 109 * (T222529) If a log entry or page revision is recorded in the database with an
 110   empty username, attempting to display it will log an error and return a "no
 111   username available" to the user instead of silently displaying nothing or
 112   invalid links.
 113
 114 === Action API changes in 1.34 ===
 115 * The 'recenteditcount' response property from action=query list=allusers,
 116   deprecated in 1.25, has been removed.
 117
 118 === Action API internal changes in 1.34 ===
 119 * …
 120
 121 === Languages updated in 1.34 ===
 122 MediaWiki supports over 350 languages. Many localisations are updated regularly.
 123 Below only new and removed languages are listed, as well as changes to languages
 124 because of Phabricator reports.
 125
 126 * (T152908) Added language support for N'Ko (nqo).
 127
 128 === Breaking changes in 1.34 ===
 129 * The global functions wfSuppressWarnings and wfRestoreWarnings, deprecated in
 130   1.26, have been removed. Use Wikimedia\AtEase\AtEase::suppressWarnings() and
 131   Wikimedia\AtEase\AtEase::restoreWarnings() directly.
 132 * Preferences class, deprecated in 1.31, has been removed.
 133 * The following parts of code, deprecated in 1.32, were removed in favor of
 134   built-in PHP functions:
 135   * CryptRand class
 136   * CryptRand service
 137   * Functions of the MWCryptRand class: singleton(), wasStrong() and generate().
 138 * Language::setCode, deprecated in 1.32, was removed. Use Language::factory to
 139   create a new Language object with a different language code.
 140 * MWNamespace::clearCaches() has been removed.  So has the $rebuild parameter
 141   to MWNamespace::getCanonicalNamespaces(), which was deprecated since 1.31.
 142   Instead, reset services, such as by calling $this->overrideMwServices() (if
 143   your test extends MediaWikiTestCase). Services will generally not pick up
 144   configuration changes from after they were created, so you must reset
 145   services after any configuration change. Even if your code works now, it is
 146   likely to break in future versions as more code is moved to services.
 147 * The ill-defined "DatabaseOraclePostInit" hook has been removed.
 148 * PreferencesFormLegacy and PreferencesForm classes, deprecated in 1.32, have
 149   been removed.
 150 * ObjectFactory class, deprecated in 1.31, has been removed.
 151 * HWLDFWordAccumudlator class, deprecated in 1.28, has been removed.
 152 * XMPInfo, XMPReader and XMPValidate, deprecated in 1.32, have been removed.
 153 * The RedirectSpecialPage::execute method could sometimes return a Title object.
 154   This behavior was removed, and the method now matches the parent signature
 155   (SpecialPage::execute) which is to return HTML string or void.
 156   To obtain the destination title, use RedirectSpecialPage::getRedirect.
 157 * The 'recenteditcount' response property from action API action=query
 158   list=allusers, deprecated in 1.25, has been removed.
 159 * SearchEngine::userNamespaces(), SearchEngine::namespacesAsText(),
 160   SearchEngine::create(), SearchEngine::getSearchTypes() and
 161   SearchEngine::getNearMatch(), methods deprecated in 1.27, have been removed.
 162 * FileRepo::streamFile(), deprecated in 1.26, has been removed.
 163 * User::randomPassword() method, deprecated in 1.27, have been removed.
 164 * MWNamespace::canTalk(), deprecated in 1.30, have been removed.
 165 * Parser class property $mUniqPrefix, deprecated in 1.26, has been removed.
 166 * wfArrayFilter() and wfArrayFilterByKey(), deprecated in 1.32, have been
 167   removed.
 168 * wfMakeUrlIndexes() function, deprecated in 1.33, have been removed.
 169 * Method signatures in WatchedItemQueryServiceExtension have changed from taking
 170   User objects to taking UserIdentity objects. Extensions implementing this
 171   interface need to be changed accordingly.
 172 * User::getGroupPage() and ::makeGroupLinkHTML(), deprecated in 1.29, have been
 173   removed. Use UserGroupMembership::getGroupPage and ::getLink instead.
 174 * User::makeGroupLinkWiki(), deprecated in 1.29, has been removed. Use
 175   UserGroupMembership::getLink() instead.
 176 * SavepointPostgres, deprecated in 1.31, has been removed.
 177 * OutputPage::enableSectionEditLinks(), OutputPage::sectionEditLinksEnabled(),
 178   ParserOptions::getEditSection(), ParserOptions::setEditSection(), and
 179   ParserOutput::getEditSectionTokens, ::getTOCEnabled, ::setEditSectionTokens,
 180   and ::setTOCEnabled, deprecated in 1.31, have been removed.
 181 * EditPage::safeUnicodeInput() and ::safeUnicodeOutput(), deprecated in 1.30,
 182   have been removed.
 183 * Four methods in OutputPage, deprecated in 1.32, have been removed. You should
 184   use OutputPage::showFatalError or throw a FatalError instead. The methods are
 185   ::showFileCopyError(), ::showFileRenameError(), ::showFileDeleteError(), and
 186   ::showFileNotFoundError().
 187 * ApiBase::truncateArray(), deprecated in 1.32, has been removed.
 188 * IcuCollation::getICUVersion(), deprecated in 1.32, has been removed. Use PHP's
 189   INTL_ICU_VERSION constant directly.
 190 * HTMLForm::setSubmitProgressive(), deprecated in 1.32, has been removed.
 191 * ResourceLoaderStartUpModules::getStartupModules() and ::getLegacyModules(),
 192   both deprecated in 1.32, have been removed.
 193 * BaseTemplate::msgHtml() and QuickTemplate::msgHtml(), deprecated in 1.32, have
 194   been removed. Use ->msg() or ->getMsg() instead.
 195 * WatchAction::getUnwatchToken(), deprecated in 1.32, has been removed. Instead,
 196   use WatchAction::getWatchToken() with action 'unwatch' directly.
 197 * Language::initEncoding(), ::recodeForEdit(), and recodeInput(), deprecated in
 198   1.28, have been removed.
 199 * PageArchive::getTextFromRow(), ::listAllPages(), and ::getLastRevisionText(),
 200   deprecated in 1.32, have been removed.
 201 * OutputPage::getModuleScripts(), ParserOutput::getModuleScripts(), deprecated
 202   in 1.33, have been removed.
 203 * User::getPasswordValidity(), deprecated in 1.33, has been removed.
 204 * ApiQueryBase::prepareUrlQuerySearchString(), deprecated in 1.33, has been
 205   removed.
 206 * ChangeTags::purgeTagUsageCache(), deprecated in 1.33, has been removed.
 207 * JobQueueGroup::pushLazyJobs(), deprecated in 1.33, has been removed.
 208 * MediaWikiTestCase::stashMwGlobals(), deprecated in 1.32, has been removed.
 209 * SearchEngine::transformSearchTerm(), deprecated in 1.32, has been removed.
 210 * The Block typehint only refers to blocks stored in the database. It should be
 211   updated to AbstractBlock in cases where any type of block could be expected.
 212 * FileRepoStatus, deprecated in 1.25, has been removed.
 213 * The LegacyHookPreAuthenticationProvider class, deprecated since its creation
 214   in 1.27, has been removed.
 215 * IP::isValidBlock(), deprecated in 1.30, has been removed.
 216 * WikiPage::prepareContentForEdit now doesn't accept an integer for $revision,
 217   was deprecated in 1.25.
 218 * The jquery.byteLength module, deprecated in 1.31, was removed.
 219   Use the mediawiki.String module instead.
 220 * mw.language.specialCharacters, deprecated in 1.33, has been removed.
 221   Use require( 'mediawiki.language.specialCharacters' ) instead.
 222 * EditPage::submit(), deprecated in 1.29, has been removed. Use $this->edit()
 223   directly.
 224 * HTMLForm::getErrors(), deprecated in 1.28, has been removed. Use
 225   getErrorsOrWarnings() instead.
 226 * SpecialPage::getTitle(), deprecated in 1.23, has been removed. Use
 227   SpecialPage::getPageTitle() instead.
 228 * jquery.ui.effect-bounce, jquery.ui.effect-explode, jquery.ui.effect-fold
 229   jquery.ui.effect-pulsate, jquery.ui.effect-slide, jquery.ui.effect-transfer,
 230   which are no longer used, have now been removed.
 231 * SpecialEmailUser::validateTarget(), ::getTarget() without a sender/user
 232   specified, deprecated in 1.30, have been removed.
 233 * BufferingStatsdDataFactory::getBuffer(), deprecated in 1.30, has been removed.
 234 * The constant DB_SLAVE, deprecated in 1.28, has been removed. Use DB_REPLICA.
 235 * The constants NS_IMAGE and NS_IMAGE_TALK, deprecated in 1.14, have been
 236   removed. Use NS_FILE and NS_FILE_TALK respectively.
 237 * Replacer, DoubleReplacer, HashtableReplacer and RegexlikeReplacer
 238   (deprecated in 1.32) have been removed. Closures should be used instead.
 239 * OutputPage::addWikiText(), ::addWikiTextWithTitle(), ::addWikiTextTitleTidy(),
 240   ::addWikiTextTidy(), ::addWikiTextTitle(), deprecated in 1.32, have been
 241   removed.
 242 * The $wgUseKeyHeader configuration option and the OutputPage::getKeyHeader()
 243   method, deprecated in 1.32, have been removed.
 244 * WebInstallerOutput::addWikiText(), deprecated in 1.32, has been removed.
 245 * Parser::fetchFile(), deprecated in 1.32, has been removed. Use the method
 246   Parser::fetchFileAndTitle() instead.
 247 * The global function wfBCP47, deprecated in 1.31, has been removed.
 248 * wfCountDown() function, deprecated in 1.31, has been removed. Use
 249   \Maintenance::countDown() method instead.
 250 * OutputPage::wrapWikiMsg() no longer accepts an options parameter. This was
 251   deprecated since 1.20.
 252 * Skin::outputPage() no longer accepts a context. This was deprecated in 1.20.
 253 * Linker::link() no longer accepts a string for the query array, as was
 254   deprecated in 1.20.
 255 * PrefixSearch::titleSearch(), deprecated in 1.23, has been removed. Use the
 256   SearchEngine::defaultPrefixSearch or ::completionSearch() methods instead.
 257 * The UserRights hook, deprecated in 1.26, has been removed. Instead, use the
 258   UserGroupsChanged hook.
 259 * Skin::getDefaultInstance(), deprecated in 1.27, has been removed. Get the
 260   instance from MediaWikiServices instead.
 261 * The UserLoadFromSession hook, deprecated in 1.27, has been removed.
 262 * The wfResetSessionID global function, deprecated in 1.27, has been removed.
 263   Use MediaWiki\Session\SessionManager instead.
 264 * The wfGetLBFactory global function, deprecated in 1.27, has been removed.
 265   Use MediaWikiServices::getInstance()->getDBLoadBalancerFactory().
 266 * The internal method OutputPage->addScriptFile() will no longer silently drop
 267   calls that use an invalid path (i.e., something other than an absolute path,
 268   protocol-relative URL, or full scheme URL), and will instead pass them to the
 269   client where they will likely 404. This usage was deprecated in 1.24.
 270 * Database::reportConnectionError, deprecated in 1.32, has been removed.
 271 * APIEditBeforeSave hook, deprecated in 1.28, has been removed. Please see
 272   EditFilterMergedContent hook for an alternative way to use this feature.
 273 * API module methods getDescription(), getParamDescription(), & getExamples(),
 274   all deprecated in 1.25 and ignored, have been removed.
 275 * The API module method getDescriptionMessage(), deprecated in 1.30, has been
 276   removed.
 277 * The JavaScript global variable wgLoadScript has been removed. Use
 278   mw.util.wikiScript( 'load' ) instead.
 279 * ResourceLoader no longer creates the 'mw.legacy' placeholder object. It has
 280   been unused since 1.16 and was deprecated in 1.22. To deprecate a property
 281   in JavaScript, use mw.log.deprecate() instead.
 282 * The 'user.groups' module, deprecated in 1.28, was removed.
 283   Use the 'user' module instead.
 284 * The ability to override User::$mRights has been removed. Use
 285   PermissionManager::addTemporaryUserRights() instead.
 286 * Previously, when iterating ResultWrapper with foreach() or a similar
 287   construct, the range of the index was 1..numRows. This has been fixed to be
 288   0..(numRows-1).
 289 * The ChangePasswordForm hook, deprecated in 1.27, has been removed. Use the
 290   AuthChangeFormFields hook or security levels instead.
 291 * WikiMap::getWikiIdFromDomain(), deprecated in 1.33, has been removed.
 292   Use WikiMap::getWikiIdFromDbDomain() instead.
 293 * The config variables $wgHtml5, $wgJsMimeType, and $wgXhtmlDefaultNamespace,
 294   which were deprecated and ignored by core since 1.22, are no longer set to any
 295   value, and SkinTemplate no longer emits a 'jsmimetype' key. Any extensions not
 296   updated since 2013 to cope with this deprecation may now break.
 297 * (T222637) Passing ResourceLoaderModule objects to ResourceLoader::register()
 298   or $wgResourceModules is no longer supported.
 299   Use the 'class' or 'factory' option of the array format instead.
 300 * The parameter $lang of the functions generateTOC and tocList in Linker and
 301   DummyLinker must be in type Language when present. Other types are
 302   deprecated since 1.33.
 303 * The static properties mw.Api.errors and mw.Api.warnings, deprecated in 1.29,
 304   have been removed.
 305 * …
 306
 307 === Deprecations in 1.34 ===
 308 * The MWNamespace class is deprecated. Use NamespaceInfo.
 309 * ExtensionRegistry->load() is deprecated, as it breaks dependency checking.
 310   Instead, use ->queue().
 311 * User::isBlocked() is deprecated since it does not tell you if the user is
 312   blocked from editing a particular page. Use User::getBlock() or
 313   PermissionManager::isBlockedFrom() or PermissionManager::userCan() instead.
 314 * User::isLocallyBlockedProxy and User::inDnsBlacklist are deprecated and moved
 315   to the BlockManager as private helper methods.
 316 * User::isDnsBlacklisted is deprecated. Use BlockManager::isDnsBlacklisted
 317   instead.
 318 * The Config argument to ChangesListSpecialPage::checkStructuredFilterUiEnabled
 319   is deprecated. Pass only the User argument.
 320 * WatchedItem::getUser is deprecated. Use getUserIdentity.
 321 * Passing a Title as the first parameter to the getTimestampById method of
 322   RevisionStore is deprecated. Omit it, passing only the remaining parameters.
 323 * Title::getPreviousRevisionId and Title::getNextRevisionId are deprecated. Use
 324   RevisionLookup::getPreviousRevision and RevisionLookup::getNextRevision.
 325 * The Title parameter to RevisionLookup::getPreviousRevision and
 326   RevisionLookup::getNextRevision is deprecated and should be omitted.
 327 * MWHttpRequest::factory is deprecated. Use HttpRequestFactory.
 328 * The Http class is deprecated. For the request, get, and post methods, use
 329   HttpRequestFactory. For isValidURI, use MWHttpRequest::isValidURI.  For
 330   getProxy, use (string)$wgHTTPProxy. For createMultiClient, construct a
 331   MultiHttpClient directly.
 332 * Http::$httpEngine is deprecated and has no replacement. The default 'guzzle'
 333   engine will eventually be made the only engine for HTTP requests.
 334 * RepoGroup::singleton(), RepoGroup::destroySingleton(),
 335   RepoGroup::setSingleton(), wfFindFile(), and wfLocalFile() are all
 336   deprecated. Use MediaWikiServices instead.
 337 * The getSubjectPage, getTalkPage, and getOtherPage of Title are deprecated.
 338   Use NamespaceInfo's getSubjectPage, getTalkPage, and getAssociatedPage.
 339 * MWMessagePack class, no longer used, has been deprecated in 1.34.
 340 * The Block class is separated into DatabaseBlock (for blocks stored in the
 341   database), and SystemBlock (for temporary blocks created by the system).
 342   SystemBlock should be used when creating any temporary blocks. Block is
 343   a deprecated alias for DatabaseBlock.
 344 * Parser::$mConf is deprecated. It will be removed entirely in a later version.
 345   Some context can be found at T224165.
 346 * Constructing Parser directly is deprecated. Obtain one from ParserFactory.
 347 * Title::moveSubpages is deprecated. Use MovePage::moveSubpages or
 348   MovePage::moveSubpagesIfAllowed.
 349 * The MWNamespace class is deprecated. Use MediaWikiServices::getNamespaceInfo.
 350 * (T62260) Hard deprecate Language::getExtraUserToggles() method.
 351 * Language::viewPrevNext function is deprecated, use
 352   PrevNextNavigationRenderer::buildPrevNextNavigation instead
 353 * User::trackBlockWithCookie and DatabaseBlock::clearCookie are deprecated. Use
 354   BlockManager::trackBlockWithCookie and BlockManager::clearCookie instead.
 355 * DatabaseBlock::setCookie, DatabaseBlock::getCookieValue,
 356   DatabaseBlock::getIdFromCookieValue and AbstractBlock::shouldTrackWithCookie
 357   are moved to internal helper methods for BlockManager::trackBlockWithCookie.
 358 * ResourceLoaderContext::getConfig and ResourceLoaderContext::getLogger have
 359   been deprecated. Inside ResourceLoaderModule subclasses, use the local methods
 360   instead. Elsewhere, use the methods from the ResourceLoader class.
 361 * The Preprocessor_DOM implementation has been deprecated.  It will be
 362   removed in a future release.  Use the Preprocessor_Hash implementation
 363   instead.
 364 * Sanitizer::attributeWhitelist() and Sanitizer::setupAttributeWhitelist()
 365   have been deprecated; they will be made private in the future.
 366 * SearchResult::termMatches() method is deprecated. It was unreliable because
 367   only populated by few search engine implementations. Use
 368   SqlSearchResult::getTermMatches() if really needed.
 369 * SearchResult::getTextSnippet( $terms ) the $terms param is being deprecated
 370   and should no longer be passed. Search engine implemenations should be
 371   responsible for carrying relevant information needed for highlighting with
 372   their own SearchResultSet/SearchResult sub-classes.
 373 * SearchEngine::$searchTerms protected field is deprecated. Moved to
 374   SearchDatabase.
 375 * The use of the $terms param in the ShowSearchHit and ShowSearchHitTitle
 376   hooks is highly discouraged as it's only populated by SearchDatabase search
 377   engines.
 378 * Skin::escapeSearchLink() is deprecated. Use Skin::getSearchLink() or the skin
 379   template option 'searchaction' instead.
 380 * LoadBalancer::haveIndex() and LoadBalancer::isNonZeroLoad() have
 381   been deprecated.
 382 * User::getRights() and User::$mRights have been deprecated. Use
 383   PermissionManager::getUserPermissions() instead.
 384 * The LocalisationCacheRecache hook no longer allows purging of message blobs
 385   to be prevented. Modifying the $purgeBlobs parameter now has no effect.
 386
 387 === Other changes in 1.34 ===
 388 * …
 389
 390 == Compatibility ==
 391 MediaWiki 1.34 requires PHP 7.0.13 or later. Although HHVM 3.18.5 or later is
 392 supported, it is generally advised to use PHP 7.0.13 or later for long term
 393 support.
 394
 395 MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
 396 but support for them is somewhat less mature. There is experimental support for
 397 Oracle and Microsoft SQL Server.
 398
 399 The supported versions are:
 400
 401 * MySQL 5.5.8 or later
 402 * PostgreSQL 9.2 or later
 403 * SQLite 3.8.0 or later
 404 * Oracle 9.0.1 or later
 405 * Microsoft SQL Server 2005 (9.00.1399)
 406
 407 == Online documentation ==
 408 Documentation for both end-users and site administrators is available on
 409 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 410 for pages that explicitly state that their contents are in the public domain):
 411
 412        https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation
 413
 414 == Mailing list ==
 415 A mailing list is available for MediaWiki user support and discussion:
 416
 417        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 418
 419 A low-traffic announcements-only list is also available:
 420
 421        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 422
 423 It's highly recommended that you sign up for one of these lists if you're
 424 going to run a public MediaWiki, so you can be notified of security fixes.
 425
 426 == IRC help ==
 427 There's usually someone online in #mediawiki on irc.freenode.net.