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