diff --git a/UPGRADE.md b/UPGRADE.md
index cde5f747693..e1ba578c43d 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -8,6 +8,17 @@ awareness about deprecated code.
 
 # Upgrade to 4.0
 
+## Abstract methods in the `AbstractSchemaManager` class have been declared as `abstract`
+
+The following abstract methods in the `AbstractSchemaManager` class have been declared as `abstract`:
+
+- `selectDatabaseColumns()`,
+- `selectDatabaseIndexes()`,
+- `selectDatabaseForeignKeys()`,
+- `getDatabaseTableOptions()`.
+
+Every non-abstract schema manager class must implement them in order to satisfy the API.
+
 # BC Break: The number of affected rows is returned as `int|string`
 
 The signatures of the methods returning the number of affected rows changed as returning `int|string` instead of `int`.
diff --git a/src/Schema/AbstractSchemaManager.php b/src/Schema/AbstractSchemaManager.php
index 56518b03125..1b8deb2a3d1 100644
--- a/src/Schema/AbstractSchemaManager.php
+++ b/src/Schema/AbstractSchemaManager.php
@@ -219,23 +219,6 @@ protected function filterAssetNames(array $assetNames): array
      * @throws Exception
      */
     public function listTables(): array
-    {
-        $tableNames = $this->listTableNames();
-
-        $tables = [];
-        foreach ($tableNames as $tableName) {
-            $tables[] = $this->listTableDetails($tableName);
-        }
-
-        return $tables;
-    }
-
-    /**
-     * @return list<Table>
-     *
-     * @throws Exception
-     */
-    protected function doListTables(): array
     {
         $currentDatabase = $this->_conn->getDatabase();
 
@@ -282,23 +265,6 @@ protected function doListTables(): array
      * @throws Exception
      */
     public function listTableDetails(string $name): Table
-    {
-        $columns     = $this->listTableColumns($name);
-        $foreignKeys = [];
-
-        if ($this->_platform->supportsForeignKeyConstraints()) {
-            $foreignKeys = $this->listTableForeignKeys($name);
-        }
-
-        $indexes = $this->listTableIndexes($name);
-
-        return new Table($name, $columns, $indexes, [], $foreignKeys, []);
-    }
-
-    /**
-     * @throws Exception
-     */
-    protected function doListTableDetails(string $name): Table
     {
         $currentDatabase = $this->_conn->getDatabase();
 
@@ -353,13 +319,8 @@ protected function normalizeName(string $name): string
      * the selection to this table.
      *
      * @throws Exception
-     *
-     * @abstract
      */
-    protected function selectDatabaseColumns(string $databaseName, ?string $tableName = null): Result
-    {
-        throw NotSupported::new(__METHOD__);
-    }
+    abstract protected function selectDatabaseColumns(string $databaseName, ?string $tableName = null): Result;
 
     /**
      * Selects index definitions of the tables in the specified database. If the table name is specified, narrows down
@@ -367,10 +328,7 @@ protected function selectDatabaseColumns(string $databaseName, ?string $tableNam
      *
      * @throws Exception
      */
-    protected function selectDatabaseIndexes(string $databaseName, ?string $tableName = null): Result
-    {
-        throw NotSupported::new(__METHOD__);
-    }
+    abstract protected function selectDatabaseIndexes(string $databaseName, ?string $tableName = null): Result;
 
     /**
      * Selects foreign key definitions of the tables in the specified database. If the table name is specified,
@@ -378,10 +336,7 @@ protected function selectDatabaseIndexes(string $databaseName, ?string $tableNam
      *
      * @throws Exception
      */
-    protected function selectDatabaseForeignKeys(string $databaseName, ?string $tableName = null): Result
-    {
-        throw NotSupported::new(__METHOD__);
-    }
+    abstract protected function selectDatabaseForeignKeys(string $databaseName, ?string $tableName = null): Result;
 
     /**
      * Returns table options for the tables in the specified database. If the table name is specified, narrows down
@@ -391,10 +346,7 @@ protected function selectDatabaseForeignKeys(string $databaseName, ?string $tabl
      *
      * @throws Exception
      */
-    protected function getDatabaseTableOptions(string $databaseName, ?string $tableName = null): array
-    {
-        throw NotSupported::new(__METHOD__);
-    }
+    abstract protected function getDatabaseTableOptions(string $databaseName, ?string $tableName = null): array;
 
     /**
      * Lists the views this connection has.
diff --git a/src/Schema/DB2SchemaManager.php b/src/Schema/DB2SchemaManager.php
index 57a0816a1f0..e1ff7b3959a 100644
--- a/src/Schema/DB2SchemaManager.php
+++ b/src/Schema/DB2SchemaManager.php
@@ -43,19 +43,6 @@ public function listTableNames(): array
         return $this->filterAssetNames($this->_getPortableTablesList($tables));
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     /**
      * {@inheritdoc}
      *
diff --git a/src/Schema/MySQLSchemaManager.php b/src/Schema/MySQLSchemaManager.php
index 34564e55c94..ec29209e052 100644
--- a/src/Schema/MySQLSchemaManager.php
+++ b/src/Schema/MySQLSchemaManager.php
@@ -50,19 +50,6 @@ class MySQLSchemaManager extends AbstractSchemaManager
         "''" => "'",
     ];
 
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Schema/OracleSchemaManager.php b/src/Schema/OracleSchemaManager.php
index b802818e2b0..42a000dc8d5 100644
--- a/src/Schema/OracleSchemaManager.php
+++ b/src/Schema/OracleSchemaManager.php
@@ -31,19 +31,6 @@
  */
 class OracleSchemaManager extends AbstractSchemaManager
 {
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Schema/PostgreSQLSchemaManager.php b/src/Schema/PostgreSQLSchemaManager.php
index 252a7ac5bd4..47410f1302f 100644
--- a/src/Schema/PostgreSQLSchemaManager.php
+++ b/src/Schema/PostgreSQLSchemaManager.php
@@ -36,19 +36,6 @@ class PostgreSQLSchemaManager extends AbstractSchemaManager
 {
     private ?string $currentSchema = null;
 
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     /**
      * {@inheritDoc}
      */
diff --git a/src/Schema/SQLServerSchemaManager.php b/src/Schema/SQLServerSchemaManager.php
index 77eb340552a..0143bcc9bd4 100644
--- a/src/Schema/SQLServerSchemaManager.php
+++ b/src/Schema/SQLServerSchemaManager.php
@@ -34,19 +34,6 @@ class SQLServerSchemaManager extends AbstractSchemaManager
 {
     private ?string $databaseCollation = null;
 
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     /**
      * {@inheritDoc}
      */
diff --git a/src/Schema/SqliteSchemaManager.php b/src/Schema/SqliteSchemaManager.php
index f13c6117e81..8734e0b0e05 100644
--- a/src/Schema/SqliteSchemaManager.php
+++ b/src/Schema/SqliteSchemaManager.php
@@ -41,19 +41,6 @@
  */
 class SqliteSchemaManager extends AbstractSchemaManager
 {
-    /**
-     * {@inheritDoc}
-     */
-    public function listTables(): array
-    {
-        return $this->doListTables();
-    }
-
-    public function listTableDetails(string $name): Table
-    {
-        return $this->doListTableDetails($name);
-    }
-
     public function renameTable(string $name, string $newName): void
     {
         $tableDiff            = new TableDiff($name);