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https://blog.it-kb.ru/2015/03/31/sharepoint-server-2013-how-to-reduce-size-of-logging-database-wss_usageapplication-via-change-retention-period-and-run-usage-data-import-job-and-purge-old-data-with-shrink/
SharePoint Server 2013 – Уменьшаем размер базы данных WSS_UsageApplication