diff --git a/lib/private/DB/MDB2SchemaManager.php b/lib/private/DB/MDB2SchemaManager.php
index 044f0ff617cd..33def1b07218 100644
--- a/lib/private/DB/MDB2SchemaManager.php
+++ b/lib/private/DB/MDB2SchemaManager.php
@@ -46,17 +46,6 @@ public function __construct($conn) {
 		$this->conn = $conn;
 	}
 
-	/**
-	 * saves database scheme to xml file
-	 * @param string $file name of file
-	 * @return bool
-	 *
-	 * TODO: write more documentation
-	 */
-	public function getDbStructure($file) {
-		return \OC\DB\MDB2SchemaWriter::saveSchemaToFile($file, $this->conn);
-	}
-
 	/**
 	 * Creates tables from XML file
 	 * @param string $file file to read structure from
@@ -117,19 +106,10 @@ public function updateDbFromStructure($file, $generateSql = false) {
 
 		if ($generateSql) {
 			return $migrator->generateChangeScript($toSchema);
-		} else {
-			$migrator->migrate($toSchema);
-			return true;
 		}
-	}
 
-	/**
-	 * @param \Doctrine\DBAL\Schema\Schema $schema
-	 * @return string
-	 */
-	public function generateChangeScript($schema) {
-		$migrator = $this->getMigrator();
-		return $migrator->generateChangeScript($schema);
+		$migrator->migrate($toSchema);
+		return true;
 	}
 
 	/**
diff --git a/lib/private/DB/MDB2SchemaWriter.php b/lib/private/DB/MDB2SchemaWriter.php
deleted file mode 100644
index ceced63a7b9e..000000000000
--- a/lib/private/DB/MDB2SchemaWriter.php
+++ /dev/null
@@ -1,177 +0,0 @@
-<?php
-/**
- * @author Bart Visscher <bartv@thisnet.nl>
- * @author Jörn Friedrich Dreyer <jfd@butonic.de>
- * @author Morris Jobke <hey@morrisjobke.de>
- * @author tbelau666 <thomas.belau@gmx.de>
- * @author Thomas Müller <thomas.mueller@tmit.eu>
- *
- * @copyright Copyright (c) 2018, ownCloud GmbH
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License, version 3,
- * along with this program.  If not, see <http://www.gnu.org/licenses/>
- *
- */
-
-namespace OC\DB;
-
-use Doctrine\DBAL\Schema\Column;
-use Doctrine\DBAL\Schema\Index;
-
-class MDB2SchemaWriter {
-	/**
-	 * @param string $file
-	 * @param \OC\DB\Connection $conn
-	 * @return bool
-	 */
-	public static function saveSchemaToFile($file, \OC\DB\Connection $conn) {
-		$config = \OC::$server->getConfig();
-
-		$xml = new \SimpleXMLElement('<database/>');
-		$xml->addChild('name', $config->getSystemValue('dbname', 'owncloud'));
-		$xml->addChild('create', 'true');
-		$xml->addChild('overwrite', 'false');
-		if ($config->getSystemValue('dbtype', 'sqlite') === 'mysql' && $config->getSystemValue('mysql.utf8mb4', false)) {
-			$xml->addChild('charset', 'utf8mb4');
-		} else {
-			$xml->addChild('charset', 'utf8');
-		}
-
-		// FIX ME: bloody work around
-		if ($config->getSystemValue('dbtype', 'sqlite') === 'oci') {
-			$filterExpression = '/^"' . \preg_quote($conn->getPrefix()) . '/';
-		} else {
-			$filterExpression = '/^' . \preg_quote($conn->getPrefix()) . '/';
-		}
-		$conn->getConfiguration()->setFilterSchemaAssetsExpression($filterExpression);
-
-		foreach ($conn->getSchemaManager()->listTables() as $table) {
-			self::saveTable($table, $xml->addChild('table'));
-		}
-		\file_put_contents($file, $xml->asXML());
-		return true;
-	}
-
-	/**
-	 * @param \Doctrine\DBAL\Schema\Table $table
-	 * @param \SimpleXMLElement $xml
-	 */
-	private static function saveTable($table, $xml) {
-		$xml->addChild('name', $table->getName());
-		$declaration = $xml->addChild('declaration');
-		foreach ($table->getColumns() as $column) {
-			self::saveColumn($column, $declaration->addChild('field'));
-		}
-		foreach ($table->getIndexes() as $index) {
-			if ($index->getName() == 'PRIMARY') {
-				$autoincrement = false;
-				foreach ($index->getColumns() as $column) {
-					if ($table->getColumn($column)->getAutoincrement()) {
-						$autoincrement = true;
-					}
-				}
-				if ($autoincrement) {
-					continue;
-				}
-			}
-			self::saveIndex($index, $declaration->addChild('index'));
-		}
-	}
-
-	/**
-	 * @param Column $column
-	 * @param \SimpleXMLElement $xml
-	 */
-	private static function saveColumn($column, $xml) {
-		$xml->addChild('name', $column->getName());
-		switch ($column->getType()) {
-			case 'SmallInt':
-			case 'Integer':
-			case 'BigInt':
-				$xml->addChild('type', 'integer');
-				$default = $column->getDefault();
-				if ($default === null && $column->getAutoincrement()) {
-					$default = '0';
-				}
-				$xml->addChild('default', $default);
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				if ($column->getAutoincrement()) {
-					$xml->addChild('autoincrement', '1');
-				}
-				if ($column->getUnsigned()) {
-					$xml->addChild('unsigned', 'true');
-				}
-				$length = '4';
-				if ($column->getType() == 'SmallInt') {
-					$length = '2';
-				} elseif ($column->getType() == 'BigInt') {
-					$length = '8';
-				}
-				$xml->addChild('length', $length);
-				break;
-			case 'String':
-				$xml->addChild('type', 'text');
-				$default = \trim($column->getDefault());
-				if ($default === '') {
-					$default = false;
-				}
-				$xml->addChild('default', $default);
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				$xml->addChild('length', $column->getLength());
-				break;
-			case 'Text':
-				$xml->addChild('type', 'clob');
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				break;
-			case 'Decimal':
-				$xml->addChild('type', 'decimal');
-				$xml->addChild('default', $column->getDefault());
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				$xml->addChild('length', '15');
-				break;
-			case 'Boolean':
-				$xml->addChild('type', 'integer');
-				$xml->addChild('default', $column->getDefault());
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				$xml->addChild('length', '1');
-				break;
-			case 'DateTime':
-				$xml->addChild('type', 'timestamp');
-				$xml->addChild('default', $column->getDefault());
-				$xml->addChild('notnull', self::toBool($column->getNotnull()));
-				break;
-		}
-	}
-
-	/**
-	 * @param Index $index
-	 * @param \SimpleXMLElement $xml
-	 */
-	private static function saveIndex($index, $xml) {
-		$xml->addChild('name', $index->getName());
-		if ($index->isPrimary()) {
-			$xml->addChild('primary', 'true');
-		} elseif ($index->isUnique()) {
-			$xml->addChild('unique', 'true');
-		}
-		foreach ($index->getColumns() as $column) {
-			$field = $xml->addChild('field');
-			$field->addChild('name', $column);
-			$field->addChild('sorting', 'ascending');
-		}
-	}
-
-	private static function toBool($bool) {
-		return $bool ? 'true' : 'false';
-	}
-}
diff --git a/lib/private/DB/Migrator.php b/lib/private/DB/Migrator.php
index db8fdd4d69e1..030c0c481f1e 100644
--- a/lib/private/DB/Migrator.php
+++ b/lib/private/DB/Migrator.php
@@ -107,32 +107,6 @@ protected function generateTemporaryTableName($name) {
 		return $this->config->getSystemValue('dbtableprefix', 'oc_') . $name . '_' . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
 	}
 
-	/**
-	 * @param \Doctrine\DBAL\Schema\Table $table
-	 * @param string $newName
-	 * @return \Doctrine\DBAL\Schema\Table
-	 */
-	protected function renameTableSchema(Table $table, $newName) {
-		/**
-		 * @var \Doctrine\DBAL\Schema\Index[] $indexes
-		 */
-		$indexes = $table->getIndexes();
-		$newIndexes = [];
-		foreach ($indexes as $index) {
-			if ($index->isPrimary()) {
-				// do not rename primary key
-				$indexName = $index->getName();
-			} else {
-				// avoid conflicts in index names
-				$indexName = $this->config->getSystemValue('dbtableprefix', 'oc_') . $this->random->generate(13, ISecureRandom::CHAR_LOWER);
-			}
-			$newIndexes[] = new Index($indexName, $index->getColumns(), $index->isUnique(), $index->isPrimary());
-		}
-
-		// foreign keys are not supported so we just set it to an empty array
-		return new Table($newName, $table->getColumns(), $newIndexes, [], 0, $table->getOptions());
-	}
-
 	public function createSchema() {
 		$filterExpression = $this->getFilterExpression();
 		$this->connection->getConfiguration()->setFilterSchemaAssetsExpression($filterExpression);
@@ -201,18 +175,6 @@ protected function applySchema(Schema $targetSchema, \Doctrine\DBAL\Connection $
 		$connection->commit();
 	}
 
-	/**
-	 * @param string $sourceName
-	 * @param string $targetName
-	 */
-	protected function copyTable($sourceName, $targetName) {
-		$quotedSource = $this->connection->quoteIdentifier($sourceName);
-		$quotedTarget = $this->connection->quoteIdentifier($targetName);
-
-		$this->connection->exec('CREATE TABLE ' . $quotedTarget . ' (LIKE ' . $quotedSource . ')');
-		$this->connection->exec('INSERT INTO ' . $quotedTarget . ' SELECT * FROM ' . $quotedSource);
-	}
-
 	/**
 	 * @param string $name
 	 */
@@ -244,11 +206,4 @@ protected function emit($sql, $step, $max) {
 		}
 		$this->dispatcher->dispatch(new GenericEvent($sql, [$step+1, $max]), '\OC\DB\Migrator::executeSql');
 	}
-
-	private function emitCheckStep($tableName, $step, $max) {
-		if ($this->dispatcher === null) {
-			return;
-		}
-		$this->dispatcher->dispatch(new GenericEvent($tableName, [$step+1, $max]), '\OC\DB\Migrator::checkTable');
-	}
 }
diff --git a/tests/lib/DB/DBSchemaTest.php b/tests/lib/DB/DBSchemaTest.php
index 1fef4e82e26b..050464e89a1a 100644
--- a/tests/lib/DB/DBSchemaTest.php
+++ b/tests/lib/DB/DBSchemaTest.php
@@ -56,7 +56,6 @@ protected function tearDown(): void {
 	public function testSchema() {
 		$this->doTestSchemaCreating();
 		$this->doTestSchemaChanging();
-		$this->doTestSchemaDumping();
 		$this->doTestSchemaRemoving();
 	}
 
@@ -73,15 +72,6 @@ public function doTestSchemaChanging() {
 		$this->assertTableExist($this->table2);
 	}
 
-	public function doTestSchemaDumping() {
-		$outfile = 'static://db_out.xml';
-		$connection = \OC::$server->getDatabaseConnection();
-		(new \OC\DB\MDB2SchemaManager($connection))->getDbStructure($outfile);
-		$content = \file_get_contents($outfile);
-		$this->assertStringContainsString($this->table1, $content);
-		$this->assertStringContainsString($this->table2, $content);
-	}
-
 	public function doTestSchemaRemoving() {
 		$connection = \OC::$server->getDatabaseConnection();
 		(new \OC\DB\MDB2SchemaManager($connection))->removeDBStructure($this->schema_file);