Database error

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A database query error has occurred. This may indicate a bug in the software.

[8502f3d221750a03f79b1bbc] /index.php?title=Special:Search&search=Pages+with+RSS+feeds Wikimedia\Rdbms\DBQueryError from line 1075 of /var/www/mediawiki/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SHOW GLOBAL VARIABLES LIKE 'ft\_min\_word\_len'
Function: SearchMySQL::minSearchLength
Error: 1146 Table 'performance_schema.global_variables' doesn't exist (127.0.0.1)

Backtrace:

#0 /var/www/mediawiki/includes/libs/rdbms/database/Database.php(933): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#1 /var/www/mediawiki/includes/search/SearchMySQL.php(446): Wikimedia\Rdbms\Database->query(string, string)
#2 /var/www/mediawiki/includes/search/SearchMySQL.php(402): SearchMySQL->minSearchLength()
#3 /var/www/mediawiki/includes/search/SearchMySQL.php(104): SearchMySQL->normalizeText(string)
#4 /var/www/mediawiki/includes/search/SearchMySQL.php(299): SearchMySQL->parseQuery(string, boolean)
#5 /var/www/mediawiki/includes/search/SearchMySQL.php(273): SearchMySQL->queryMain(array, string, boolean)
#6 /var/www/mediawiki/includes/search/SearchMySQL.php(188): SearchMySQL->getQuery(string, boolean)
#7 /var/www/mediawiki/includes/search/SearchMySQL.php(178): SearchMySQL->searchInternal(string, boolean)
#8 /var/www/mediawiki/includes/specials/SpecialSearch.php(318): SearchMySQL->searchTitle(string)
#9 /var/www/mediawiki/includes/specials/SpecialSearch.php(185): SpecialSearch->showResults(string)
#10 /var/www/mediawiki/includes/specialpage/SpecialPage.php(522): SpecialSearch->execute(NULL)
#11 /var/www/mediawiki/includes/specialpage/SpecialPageFactory.php(578): SpecialPage->run(NULL)
#12 /var/www/mediawiki/includes/MediaWiki.php(287): SpecialPageFactory::executePath(Title, RequestContext)
#13 /var/www/mediawiki/includes/MediaWiki.php(862): MediaWiki->performRequest()
#14 /var/www/mediawiki/includes/MediaWiki.php(523): MediaWiki->main()
#15 /var/www/mediawiki/index.php(43): MediaWiki->run()
#16 {main}