diff --git a/lib/private/Tags.php b/lib/private/Tags.php
index 2bc5572c40..cf1c5c0fba 100644
--- a/lib/private/Tags.php
+++ b/lib/private/Tags.php
@@ -237,7 +237,7 @@ class Tags implements \OCP\ITags {
 					$entries[$objId][] = $row['category'];
 				}
 				if ($result === null) {
-					\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OCP\DB::getErrorMessage(), \OCP\Util::ERROR);
+					\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OC::$server->getDatabaseConnection()->getError(), \OCP\Util::ERROR);
 					return false;
 				}
 			}
@@ -291,7 +291,7 @@ class Tags implements \OCP\ITags {
 			$stmt = \OCP\DB::prepare($sql);
 			$result = $stmt->execute(array($tagId));
 			if ($result === null) {
-				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OCP\DB::getErrorMessage(), \OCP\Util::ERROR);
+				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OC::$server->getDatabaseConnection()->getError(), \OCP\Util::ERROR);
 				return false;
 			}
 		} catch(\Exception $e) {
@@ -534,7 +534,7 @@ class Tags implements \OCP\ITags {
 				. 'WHERE `uid` = ?');
 			$result = $stmt->execute(array($arguments['uid']));
 			if ($result === null) {
-				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OCP\DB::getErrorMessage(), \OCP\Util::ERROR);
+				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OC::$server->getDatabaseConnection()->getError(), \OCP\Util::ERROR);
 			}
 		} catch(\Exception $e) {
 			\OC::$server->getLogger()->logException($e, [
@@ -572,7 +572,7 @@ class Tags implements \OCP\ITags {
 				. 'WHERE `uid` = ?');
 			$result = $stmt->execute(array($arguments['uid']));
 			if ($result === null) {
-				\OCP\Util::writeLog('core', __METHOD__. ', DB error: ' . \OCP\DB::getErrorMessage(), \OCP\Util::ERROR);
+				\OCP\Util::writeLog('core', __METHOD__. ', DB error: ' . \OC::$server->getDatabaseConnection()->getError(), \OCP\Util::ERROR);
 			}
 		} catch(\Exception $e) {
 			\OC::$server->getLogger()->logException($e, [
@@ -603,7 +603,7 @@ class Tags implements \OCP\ITags {
 			$stmt = \OCP\DB::prepare($query);
 			$result = $stmt->execute($updates);
 			if ($result === null) {
-				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OCP\DB::getErrorMessage(), \OCP\Util::ERROR);
+				\OCP\Util::writeLog('core', __METHOD__. 'DB error: ' . \OC::$server->getDatabaseConnection()->getError(), \OCP\Util::ERROR);
 				return false;
 			}
 		} catch(\Exception $e) {
@@ -773,7 +773,7 @@ class Tags implements \OCP\ITags {
 					$result = $stmt->execute(array($id));
 					if ($result === null) {
 						\OCP\Util::writeLog('core',
-							__METHOD__. 'DB error: ' . \OCP\DB::getErrorMessage(),
+							__METHOD__. 'DB error: ' . \OC::$server->getDatabaseConnection()->getError(),
 							\OCP\Util::ERROR);
 						return false;
 					}
diff --git a/lib/public/DB.php b/lib/public/DB.php
index 23ebdceccd..85a34ff37a 100644
--- a/lib/public/DB.php
+++ b/lib/public/DB.php
@@ -61,33 +61,4 @@ class DB {
 		return \OC_DB::prepare($query, $limit, $offset);
 	}
 
-	/**
-	 * Start a transaction
-	 * @deprecated 8.1.0 use beginTransaction() of \OCP\IDBConnection - \OC::$server->getDatabaseConnection()
-	 * @since 4.5.0
-	 */
-	public static function beginTransaction() {
-		\OC::$server->getDatabaseConnection()->beginTransaction();
-	}
-
-	/**
-	 * Commit the database changes done during a transaction that is in progress
-	 * @deprecated 8.1.0 use commit() of \OCP\IDBConnection - \OC::$server->getDatabaseConnection()
-	 * @since 4.5.0
-	 */
-	public static function commit() {
-		\OC::$server->getDatabaseConnection()->commit();
-	}
-
-	/**
-	 * returns the error code and message as a string for logging
-	 * works with DoctrineException
-	 * @return string
-	 * @deprecated 8.1.0 use getError() of \OCP\IDBConnection - \OC::$server->getDatabaseConnection()
-	 * @since 6.0.0
-	 */
-	public static function getErrorMessage() {
-		return \OC::$server->getDatabaseConnection()->getError();
-	}
-
 }