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問題
DB アップグレード ツールを実行すると、重複または既存の defaultvirtualHost 列に関するエラーが原因でアップグレードが失敗します。 (以下のエラーの例を参照してください)
Oracle DB のアップグレード
Caused by: com.liferay.portal.kernel.upgrade.UpgradeException: java.sql.SQLException: ORA-01430: column being added already exists in table
MySQL のアップグレード
Caused by: java.sql.SQLSyntaxErrorException: Duplicate column name 'defaultVirtualHost'