diff --git a/composer.json b/composer.json
index 079348ba..b15cab20 100644
--- a/composer.json
+++ b/composer.json
@@ -5,6 +5,9 @@
         "psr/http-message": "*",
         "psr/log": "*"
     },
+    "require": {
+        "php": "^8.1"
+    },
     "require-dev": {
         "redaxo/php-cs-fixer-config": "^2.0",
         "friendsofphp/php-cs-fixer": "v3.37.1",
diff --git a/docs/09_multiple_db_usage.md b/docs/09_multiple_db_usage.md
new file mode 100644
index 00000000..88103a53
--- /dev/null
+++ b/docs/09_multiple_db_usage.md
@@ -0,0 +1,27 @@
+# Alternative DB aus config.yml nutzen
+
+> Wenn in der `config.yml` mehrere Datenbankverbindungen eingerichtet sind, lässt sich YForm auch mit diesen
+> Datenbanken nutzen.
+
+## Verfügbarkeit der Funktion
+
+Ist nur eine Datenbankverbindung in der `config.yml` eingerichteten, werden die Bedienelemente für multiple Datenbanken
+nicht angezeigt. Erst wenn mehrere Verbindungen eingerichtet sind, aktivieren sich die Elemente automatisch.
+
+### Im Migrator
+
+In der Tabellen-Migration haben alle für die Migration verfügbaren Tabellen ein Prefix mit der Datenbank, in welcher sie
+liegen vor ihrem Namen.
+
+### Beim Erstellen
+
+Beim Erstellen einer neuen Tabelle über den Table Manager lässt sich die gewünschte Datenbank auswählen. Wird eine
+Tabelle im weiteren Verlauf bearbeitet, so wird die Datenbank, in welcher sie gespeichert ist, als Information
+angezeigt.
+
+## ⚠ Wichtige Hinweise
+
+1. Relationstabellen müssen in derselben Datenbank liegen wie die verknüpfte Tabelle. Es erfolgt **keine 
+   Überprüfung**, ob die Tabelle wirklich in derselben Datenbank liegt. Die Verantwortung dafür liegt beim 
+   Datenbank-Designer, welcher die Relation erstellt.
+2. Die Verwaltung der Daten liegt immer in Datenbank 1.
diff --git a/lang/de_de.lang b/lang/de_de.lang
index 98bb865e..ad70e936 100644
--- a/lang/de_de.lang
+++ b/lang/de_de.lang
@@ -280,5 +280,4 @@ yform_docs_yorm = YOrm
 yform_docs_email = E-Mail Templates
 yform_docs_rest = REST-API
 yform_docs_tools = Tools
-
-
+yform_docs_multiple_db_usage = Nutzung mehrerer Datenbanken
diff --git a/lang/en_gb.lang b/lang/en_gb.lang
index 7104bb94..56e64f95 100644
--- a/lang/en_gb.lang
+++ b/lang/en_gb.lang
@@ -264,4 +264,4 @@ yform_docs_formbuilder = Form builder
 yform_docs_demos = Demos
 yform_docs_yorm = Yorm
 yform_docs_plugins = Plugins
-
+yform_docs_multiple_db_usage = Use multiple databases
diff --git a/lang/es_es.lang b/lang/es_es.lang
index d2e8fa24..db3ef0e5 100644
--- a/lang/es_es.lang
+++ b/lang/es_es.lang
@@ -261,4 +261,4 @@ yform_docs_formbuilder = Formbuilder
 yform_docs_demos = Demos
 yform_docs_yorm = Yorm
 yform_docs_plugins = PlugIns
-
+yform_docs_multiple_db_usage = Utilizar varias bases de datos
diff --git a/lang/pt_br.lang b/lang/pt_br.lang
index 4229154a..59606ce9 100644
--- a/lang/pt_br.lang
+++ b/lang/pt_br.lang
@@ -170,3 +170,5 @@ yform_values_options_boolvalues	= 	Valores  Values (0,1 = não selecionado, sele
 
 yform_geo_get_position = Obter a localização
 yform_geo_clear_position = Criar localização
+
+yform_docs_multiple_db_usage = Utilização de várias bancos de dados
diff --git a/lang/sv_se.lang b/lang/sv_se.lang
index 525fddcd..ebb71136 100644
--- a/lang/sv_se.lang
+++ b/lang/sv_se.lang
@@ -267,5 +267,4 @@ yform_docs_yorm = Yorm
 yform_docs_email = E-Mail mallar
 yform_docs_rest = REST-API
 yform_docs_tools = Verktyg
-
-
+yform_docs_multiple_db_usage = Använda flera databaser
diff --git a/lib/yform.php b/lib/yform.php
index c0e7d841..bf1ed0c4 100644
--- a/lib/yform.php
+++ b/lib/yform.php
@@ -80,6 +80,7 @@ public function __construct(array $params = [])
         $this->objparams['main_where'] = ''; // like "id=12" for db
         $this->objparams['main_id'] = -1; // unique Dataset ID
         $this->objparams['main_table'] = ''; // for db and unique
+        $this->objparams['db_id'] = 1; // select alternative database
         $this->objparams['sql_object'] = null; // rex_sql
 
         $this->objparams['form_hiddenfields'] = [];
@@ -154,6 +155,20 @@ public function setDebug(bool $s = true): self
         return $this;
     }
 
+    /**
+     * Set an alternative database ID. The database with ID $databaseId must be configured and working in core Redaxo
+     * `config.yml`.
+     *
+     * @param int $databaseId
+     *
+     * @return $this
+     */
+    public function setDatabaseId(int $databaseId): static
+    {
+        $this->objparams['db_id'] = $databaseId;
+        return $this;
+    }
+
     public function addPostSaveFunction($callback): self
     {
         $this->postSaveFunctions[] = $callback;
@@ -294,7 +309,7 @@ public function executeFields(): self
         // 2. setValue defaults via sql_object
         if ($this->objparams['getdata']) {
             if (!$this->objparams['sql_object'] instanceof rex_sql) {
-                $this->objparams['sql_object'] = rex_sql::factory();
+                $this->objparams['sql_object'] = rex_sql::factory($this->objparams['db_id']);
                 $this->objparams['sql_object']->setDebug($this->objparams['debug']);
                 $this->objparams['sql_object']->setQuery('SELECT * from ' . $this->objparams['main_table'] . ' WHERE ' . $this->objparams['main_where']);
             }
@@ -816,4 +831,21 @@ public function hasWarnings(): bool
         $hasWarningMessages = 0 != count($this->objparams['warning_messages']);
         return $hasWarnings || $hasWarningMessages;
     }
+
+    /**
+     * Return the database configurations from `config.yml`.
+     *
+     * @return array<int, array{
+     *              host: string, login: string, password: string, name: string,
+     *              persistent: bool, ssl_key: ?string, ssl_cert: ?string, ssl_ca: ?string
+     *         }>
+     */
+    public static function getDatabaseConfigurations()
+    {
+        // Only return entries from the db section, that actually contain real data, not empty stubs.
+        return array_filter(
+            rex::getProperty('db'),
+            fn($dbConfig) => !empty($dbConfig['host']) && !empty($dbConfig['login'])
+        );
+    }
 }
diff --git a/lib/yform/action/create_table.php b/lib/yform/action/create_table.php
index 3412e4bd..e0d1f96c 100644
--- a/lib/yform/action/create_table.php
+++ b/lib/yform/action/create_table.php
@@ -12,11 +12,12 @@ class rex_yform_action_create_table extends rex_yform_action_abstract
     public function executeAction(): void
     {
         $table_name = $this->getElement(2);
+        $db_id = $this->params['db_id'] ?? 1;
         $table_name = str_replace('%TABLE_PREFIX%', rex::getTablePrefix(), $table_name);
         $table_exists = false;
         $cols = [];
 
-        $tables = rex_sql::factory()->getArray('show tables');
+        $tables = rex_sql::factory($db_id)->getArray('show tables');
         foreach ($tables as $table) {
             if (current($table) == $table_name) {
                 $table_exists = true;
@@ -25,16 +26,16 @@ public function executeAction(): void
         }
 
         if (!$table_exists) {
-            rex_sql::factory()->setQuery('CREATE TABLE `' . $table_name . '` (`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;');
+            rex_sql::factory($db_id)->setQuery('CREATE TABLE `' . $table_name . '` (`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;');
         }
 
-        foreach (rex_sql::factory()->getArray('show columns from ' . $table_name) as $k => $v) {
+        foreach (rex_sql::factory($db_id)->getArray('show columns from ' . $table_name) as $k => $v) {
             $cols[] = $v['Field'];
         }
 
         foreach ($this->params['value_pool']['sql'] as $key => $value) {
             if (!in_array($key, $cols)) {
-                rex_sql::factory()->setQuery('ALTER TABLE `' . $table_name . '` ADD `' . $key . '` TEXT NOT NULL;');
+                rex_sql::factory($db_id)->setQuery('ALTER TABLE `' . $table_name . '` ADD `' . $key . '` TEXT NOT NULL;');
             }
         }
     }
diff --git a/lib/yform/action/db.php b/lib/yform/action/db.php
index 26068959..701664da 100644
--- a/lib/yform/action/db.php
+++ b/lib/yform/action/db.php
@@ -12,7 +12,8 @@ class rex_yform_action_db extends rex_yform_action_abstract
 {
     public function executeAction(): void
     {
-        $sql = rex_sql::factory();
+        $db_id = $this->params['db_id'] ?? 1;
+        $sql = rex_sql::factory($db_id);
         $sql->setDebug($this->params['debug']);
 
         if (!$main_table = $this->getElement(2)) {
@@ -56,7 +57,7 @@ public function executeAction(): void
                 $action = 'update';
 
                 if ($this->params['main_id'] <= 0) {
-                    $sql_id = rex_sql::factory();
+                    $sql_id = rex_sql::factory($db_id);
                     $sql_id->setTable($main_table);
                     $sql_id->setWhere($where);
                     $sql_id->select('id');
diff --git a/lib/yform/action/db_query.php b/lib/yform/action/db_query.php
index 8765151b..96e90b77 100644
--- a/lib/yform/action/db_query.php
+++ b/lib/yform/action/db_query.php
@@ -11,6 +11,7 @@ class rex_yform_action_db_query extends rex_yform_action_abstract
 {
     public function executeAction(): void
     {
+        $db_id = $this->params['db_id'] ?? 1;
         $query = trim($this->getElement(2));
         $labels = explode(',', $this->getElement(3));
 
@@ -22,7 +23,7 @@ public function executeAction(): void
         }
 
         try {
-            $sql = rex_sql::factory();
+            $sql = rex_sql::factory($db_id);
             $sql->setDebug($this->params['debug']);
 
             $params = [];
diff --git a/lib/yform/action/readtable.php b/lib/yform/action/readtable.php
index 6c6db2a3..364f3ba5 100644
--- a/lib/yform/action/readtable.php
+++ b/lib/yform/action/readtable.php
@@ -11,12 +11,13 @@ class rex_yform_action_readtable extends rex_yform_action_abstract
 {
     public function executeAction(): void
     {
+        $db_id = $this->params['db_id'] ?? 1;
         if (!isset($this->params['value_pool']['email'][$this->getElement(4)])) {
             return;
         }
         $value = $this->params['value_pool']['email'][$this->getElement(4)];
 
-        $gd = rex_sql::factory();
+        $gd = rex_sql::factory($db_id);
         if ($this->params['debug']) {
             $gd->setDebug();
         }
diff --git a/lib/yform/validate/in_table.php b/lib/yform/validate/in_table.php
index e81841f8..0bfd2ce9 100644
--- a/lib/yform/validate/in_table.php
+++ b/lib/yform/validate/in_table.php
@@ -11,10 +11,12 @@ class rex_yform_validate_in_table extends rex_yform_validate_abstract
 {
     public function enterObject()
     {
-        $db = rex_sql::factory();
+        $table = $this->getElement(3);
+        $db_id = $this->params['db_id'] ?? 1;
+
+        $db = rex_sql::factory($db_id);
         $db->setDebug($this->params['debug']);
 
-        $table = $this->getElement(3);
         $labels = $this->getElement(2);
         $fields = $this->getElement(4);
 
diff --git a/lib/yform/validate/unique.inc.php b/lib/yform/validate/unique.inc.php
index b64a7e65..f0940e11 100644
--- a/lib/yform/validate/unique.inc.php
+++ b/lib/yform/validate/unique.inc.php
@@ -11,7 +11,8 @@ class rex_yform_validate_unique extends rex_yform_validate_abstract
 {
     public function enterObject()
     {
-        $cd = rex_sql::factory();
+        $db_id = $this->params['db_id'] ?? 1;
+        $cd = rex_sql::factory($db_id);
 
         $table = $this->params['main_table'];
         if ('' != $this->getElement('table')) {
diff --git a/lib/yform/value/choice.php b/lib/yform/value/choice.php
index cb23bcd5..a827dc30 100644
--- a/lib/yform/value/choice.php
+++ b/lib/yform/value/choice.php
@@ -285,6 +285,7 @@ public static function getSearchFilter($params)
     private static function createChoiceList($elements)
     {
         $self = new self();
+        $db_id = $self->params['db_id'] ?? 1;
 
         $options = [
             'choices' => [],
@@ -324,7 +325,7 @@ private static function createChoiceList($elements)
         $choiceList = new rex_yform_choice_list($options);
 
         if (is_string($choicesElement) && 'SELECT' == rex_sql::getQueryType($choicesElement)) {
-            $sql = rex_sql::factory();
+            $sql = rex_sql::factory($db_id);
             $sql->setDebug($self->getParam('debug'));
             $choiceList->createListFromSqlArray(
                 $sql->getArray($choicesElement),
diff --git a/lib/yform/value/index.php b/lib/yform/value/index.php
index 5b14b26e..4e41ad84 100644
--- a/lib/yform/value/index.php
+++ b/lib/yform/value/index.php
@@ -110,7 +110,7 @@ private function addRelation(array &$relations, array $names)
     private function getRelationValues(array $relations)
     {
         $table = rex_yform_manager_table::get($this->params['main_table']);
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($table->getDatabaseId());
         $sql->setDebug($this->params['debug']);
 
         foreach ($relations as $name => $sub) {
diff --git a/plugins/manager/fragments/yform/manager/page/list.php b/plugins/manager/fragments/yform/manager/page/list.php
index 3566e060..bbdaf8d3 100644
--- a/plugins/manager/fragments/yform/manager/page/list.php
+++ b/plugins/manager/fragments/yform/manager/page/list.php
@@ -14,7 +14,7 @@
 $hasDataPageFunctions = $this->getVar('hasDataPageFunctions');
 
 /** @var rex_yform_list $list */
-$list = rex_yform_list::factory($query, $table->getListAmount());
+$list = rex_yform_list::factory($query, $table->getListAmount(), db: $table->getDatabaseId());
 
 $list->addTableAttribute('class', 'table-striped table-hover yform-table-' . rex_string::normalize($this->table->getTableName()));
 
diff --git a/plugins/manager/install.php b/plugins/manager/install.php
index 7709796f..17ec9325 100644
--- a/plugins/manager/install.php
+++ b/plugins/manager/install.php
@@ -21,6 +21,7 @@
     ->ensurePrimaryIdColumn()
     ->ensureColumn(new rex_sql_column('status', 'tinyint(1)'))
     ->ensureColumn(new rex_sql_column('table_name', 'varchar(191)'))
+    ->ensureColumn(new rex_sql_column('db_id', 'tinyint unsigned', false, 1))
     ->ensureColumn(new rex_sql_column('name', 'varchar(191)'))
     ->ensureColumn(new rex_sql_column('description', 'text'))
     ->ensureColumn(new rex_sql_column('list_amount', 'int(11)', false, '50'))
diff --git a/plugins/manager/lang/de_de.lang b/plugins/manager/lang/de_de.lang
index 9fd0f29c..5ec4e17c 100644
--- a/plugins/manager/lang/de_de.lang
+++ b/plugins/manager/lang/de_de.lang
@@ -58,6 +58,7 @@ yform_manager_table_enter_name = Bitte tragen Sie die Tabellenbezeichnung ein
 yform_manager_table_enter_specialchars = Bitte tragen Sie beim Tabellenname nur Kleinbuchstaben und Zahlen ein. Das erste Zeichen muss ein Buchstabe sein
 yform_manager_table_exists = Dieser Tabellenname ist bereits vorhanden
 
+yform_manager_database_selection = Datenbank
 yform_manager_table_prio = Priorität
 yform_manager_table_prio_short = Prio
 yform_manager_table_name = Name
diff --git a/plugins/manager/lang/en_gb.lang b/plugins/manager/lang/en_gb.lang
index 468e7df9..db87d74f 100644
--- a/plugins/manager/lang/en_gb.lang
+++ b/plugins/manager/lang/en_gb.lang
@@ -56,6 +56,7 @@ yform_manager_table_enter_name = Please enter table name
 yform_manager_table_enter_specialchars = Please enter only letters and numbers for the table name. The first character must be a letter
 yform_manager_table_exists = This table name already exists
 
+yform_manager_database_selection = Database
 yform_manager_table_prio = Priority
 yform_manager_table_prio_short = Prio
 yform_manager_table_name = Name
diff --git a/plugins/manager/lang/es_es.lang b/plugins/manager/lang/es_es.lang
index 3e2bc382..34dbc2f4 100644
--- a/plugins/manager/lang/es_es.lang
+++ b/plugins/manager/lang/es_es.lang
@@ -56,6 +56,7 @@ yform_manager_table_enter_name = Por favor ingrese el nombre de la tabla
 yform_manager_table_enter_specialchars = Por favor ingrese solo letras y números para el nombre de la tabla. El primer personaje debe ser una letra
 yform_manager_table_exists = Este nombre de tabla ya existe
 
+yform_manager_database_selection = Base de datos
 yform_manager_table_prio = Prioridad
 yform_manager_table_prio_short = Prio
 yform_manager_table_name = Nombre
diff --git a/plugins/manager/lang/pt_br.lang b/plugins/manager/lang/pt_br.lang
index 460d00bc..59752678 100644
--- a/plugins/manager/lang/pt_br.lang
+++ b/plugins/manager/lang/pt_br.lang
@@ -52,6 +52,7 @@ yform_manager_table_enter_name = Por favor, insira um nome para a tabela
 yform_manager_table_enter_specialchars = Por favor, insira somente letras e números no nome da tabela. O primeiro caractere deve ser uma letra.
 yform_manager_table_exists = Esse noem já existe.
 
+yform_manager_database_selection = Bankco de dados
 yform_manager_table_prio = Prioridade
 yform_manager_table_prio_short = Prio
 yform_manager_table_name = Nome
diff --git a/plugins/manager/lang/sv_se.lang b/plugins/manager/lang/sv_se.lang
index 625e2f5b..86f82d84 100644
--- a/plugins/manager/lang/sv_se.lang
+++ b/plugins/manager/lang/sv_se.lang
@@ -56,6 +56,7 @@ yform_manager_table_enter_name = Var god ange tabellnamnet
 yform_manager_table_enter_specialchars = Var god ange endast bokstäver och siffror vid tabellnamnet. Första tecknet måste vara en bokstav.
 yform_manager_table_exists = Tabellnamnet finns redan
 
+yform_manager_database_selection = Databas
 yform_manager_table_prio = Prioritet
 yform_manager_table_prio_short = Prio
 yform_manager_table_name = Namn
diff --git a/plugins/manager/lib/yform/action/manage_db.php b/plugins/manager/lib/yform/action/manage_db.php
index d9c54f5a..5396621f 100644
--- a/plugins/manager/lib/yform/action/manage_db.php
+++ b/plugins/manager/lib/yform/action/manage_db.php
@@ -25,8 +25,6 @@ public function executeAction(): void
         // ********************************* TABLE A
 
         // $this->params["debug"]= TRUE;
-        $sql = rex_sql::factory();
-        $sql->setDebug($this->params['debug']);
 
         $main_table = '';
         if ('' != $this->getElement(2)) {
@@ -34,6 +32,10 @@ public function executeAction(): void
         } else {
             $main_table = $this->params['main_table'];
         }
+        $db_id = $this->params['db_id'] ?? 1;
+        $sql = rex_sql::factory($db_id);
+        $sql->setDebug($this->params['debug']);
+
 
         if ('' == $main_table) {
             $this->params['form_show'] = true;
diff --git a/plugins/manager/lib/yform/manager.php b/plugins/manager/lib/yform/manager.php
index e1061f3f..b9524cee 100644
--- a/plugins/manager/lib/yform/manager.php
+++ b/plugins/manager/lib/yform/manager.php
@@ -1426,7 +1426,8 @@ public static function checkField($l, $v, $p)
     public function createTable($mifix, $data_table, $params = [], $debug = false)
     {
         // Tabelle erstellen wenn noch nicht vorhanden
-        $c = rex_sql::factory();
+        $db_id = rex_yform_manager_table::get($data_table)->getDatabaseId();
+        $c = rex_sql::factory($db_id);
         $c->setDebug($debug);
         $c->setQuery('CREATE TABLE IF NOT EXISTS `' . $data_table . '` ( `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;');
 
diff --git a/plugins/manager/lib/yform/manager/dataset.php b/plugins/manager/lib/yform/manager/dataset.php
index aca1e623..dc8f26b8 100644
--- a/plugins/manager/lib/yform/manager/dataset.php
+++ b/plugins/manager/lib/yform/manager/dataset.php
@@ -161,7 +161,8 @@ public static function queryOne(string $query, array $params = [], ?string $tabl
             return $class::queryOne($query, $params, $table);
         }
 
-        $sql = rex_sql::factory();
+        $db_id = rex_yform_manager_table::get($table)->getDatabaseId();
+        $sql = rex_sql::factory($db_id);
         $sql
             ->setDebug(self::$debug)
             ->setQuery($query, $params);
@@ -191,7 +192,8 @@ public static function queryCollection(string $query, array $params = [], ?strin
             return $class::queryCollection($query, $params, $table);
         }
 
-        $sql = rex_sql::factory();
+        $db_id = rex_yform_manager_table::get($table)->getDatabaseId();
+        $sql = rex_sql::factory($db_id);
         $sql->setDebug(self::$debug);
 
         $data = $sql->getArray($query, $params);
@@ -301,7 +303,7 @@ public function getData(): array
 
     public function loadData(): void
     {
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($this->getTable()->getDatabaseId());
         $rows = $sql->getArray('SELECT * FROM `' . $this->table . '` WHERE id = ? LIMIT 1', [$this->id]);
         $this->exists = isset($rows[0]);
         if ($this->exists) {
@@ -463,7 +465,7 @@ public function delete(): bool
             $this->makeSnapshot(self::ACTION_DELETE);
         }
 
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($this->getTable()->getDatabaseId());
         $sql
             ->setDebug(self::$debug)
             ->setTable($this->table)
@@ -572,19 +574,20 @@ public function makeSnapshot(string $action): void
         // ep to overwrite user
         $user = rex_extension::registerPoint(new rex_extension_point('YCOM_HISTORY_USER', $user));
 
-        $sql = rex_sql::factory();
-        $sql->setDebug(self::$debug);
-        $sql
+        $historySql = rex_sql::factory();
+        $historySql->setDebug(self::$debug);
+        $historySql
             ->setTable(rex::getTable('yform_history'))
             ->setValue('table_name', $this->table)
             ->setValue('dataset_id', $this->id)
             ->setValue('action', $action)
             ->setValue('user', $user)
-            ->setValue('timestamp', $sql::datetime())
+            ->setValue('timestamp', $historySql::datetime())
             ->insert();
 
-        $historyId = $sql->getLastId();
+        $historyId = $historySql->getLastId();
 
+        $sql = rex_sql::factory($this->getTable()->getDatabaseId());
         $sql
             ->setTable($this->table)
             ->setWhere(['id' => $this->id])
@@ -619,7 +622,7 @@ public function makeSnapshot(string $action): void
             }
         }
 
-        $sql->setQuery('INSERT INTO ' . rex::getTable('yform_history_field') . ' (`history_id`, `field`, `value`) VALUES ' . implode(', ', $inserts));
+        $historySql->setQuery('INSERT INTO ' . rex::getTable('yform_history_field') . ' (`history_id`, `field`, `value`) VALUES ' . implode(', ', $inserts));
     }
 
     public function restoreSnapshot(int $snapshotId): bool
@@ -681,6 +684,7 @@ private function getInternalForm(): rex_yform
         $yform->setObjectparams('form_needs_output', false);
         $yform->setObjectparams('csrf_protection', false);
         $yform->setObjectparams('get_field_type', '');
+        $yform->setObjectparams('db_id', $this->getTable()->getDatabaseId());
 
         return $yform;
     }
@@ -716,6 +720,7 @@ private function createForm(): rex_yform
         }
 
         $yform->setObjectparams('main_table', $this->table);
+        $yform->setObjectparams('db_id', $this->getTable()->getDatabaseId());
         $yform->setActionField('db', [$this->table, 'main_where']);
 
         return $yform;
diff --git a/plugins/manager/lib/yform/manager/query.php b/plugins/manager/lib/yform/manager/query.php
index 466c895e..fa0c15fa 100644
--- a/plugins/manager/lib/yform/manager/query.php
+++ b/plugins/manager/lib/yform/manager/query.php
@@ -731,7 +731,7 @@ public function findValueRaw(string $expression)
             ->selectRaw($expression, 'value')
             ->limit(1);
 
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($query->getTable()->getDatabaseId());
         $sql->setQuery($query->getQuery(), $query->getParams());
 
         return $sql->getRows() ? $sql->getValue('value') : null;
@@ -761,7 +761,7 @@ public function findValuesRaw(string $expression, ?string $keyColumn = null): ar
             $query->select($keyColumn);
         }
 
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($query->getTable()->getDatabaseId());
         $array = $sql->getArray($query->getQuery(), $query->getParams());
 
         return array_column($array, 'value', $keyColumn);
@@ -775,7 +775,7 @@ public function count(): int
             ->selectRaw('COUNT(*)', 'count')
             ->resetOrderBy();
 
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($query->getTable()->getDatabaseId());
         $sql->setQuery($query->getQuery(), $query->getParams());
 
         return (int) $sql->getValue('count');
@@ -790,7 +790,7 @@ public function exists(): bool
             ->resetOrderBy()
             ->limit(1);
 
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($query->getTable()->getDatabaseId());
         $sql->setQuery($query->getQuery(), $query->getParams());
 
         return $sql->getRows() > 0;
diff --git a/plugins/manager/lib/yform/manager/table.php b/plugins/manager/lib/yform/manager/table.php
index 0d528ffb..f79606a3 100644
--- a/plugins/manager/lib/yform/manager/table.php
+++ b/plugins/manager/lib/yform/manager/table.php
@@ -35,8 +35,8 @@ private function __construct(array $data)
     {
         $this->values = $data['table'];
         $this->columns = $data['columns'];
-        $this->relatedTableNames = $data['related_tables'];
-        $this->fieldValues = $data['fields'];
+        $this->relatedTableNames = $data['related_tables'] ?? [];
+        $this->fieldValues = $data['fields'] ?? [];
     }
 
     public static function setTableLayout(string $tableName, string $path): void
@@ -53,6 +53,16 @@ public function getTableLayout(): string
         return $tableLayout;
     }
 
+    /**
+     * Returns the ID of the database where this table is saved. Database ID must be configured in `config.yml`.
+     *
+     * @return int
+     */
+    public function getDatabaseId(): int
+    {
+        return $this->values['db_id'] ?? 1;
+    }
+
     /**
      * @param string $tableName
      *
@@ -159,7 +169,7 @@ public function getId()
 
     public function hasId(): bool
     {
-        $columns = rex_sql::showColumns($this->getTableName());
+        $columns = rex_sql::showColumns($this->getTableName(), $this->getDatabaseId());
         foreach ($columns as $column) {
             if ('id' == $column['name'] && 'auto_increment' == $column['extra']) {
                 return true;
@@ -380,7 +390,7 @@ public function toArray()
 
     public function removeRelationTableRelicts()
     {
-        $deleteSql = rex_sql::factory();
+        $deleteSql = rex_sql::factory($this->getDatabaseId());
         foreach ($this->getValueFields(['type_name' => 'be_manager_relation']) as $field) {
             if ($field->getElement('relation_table')) {
                 $table = self::get($field->getElement('relation_table'));
@@ -398,7 +408,7 @@ public function removeRelationTableRelicts()
 
     public static function getMaximumTablePrio()
     {
-        $sql = 'select max(prio) as prio from ' . self::table() . '';
+        $sql = 'select max(prio) as prio from ' . self::table();
         $gf = rex_sql::factory();
         if (self::$debug) {
             $gf->setDebug();
@@ -519,7 +529,8 @@ private static function getCache(): mixed
             self::$cache[$tableName]['table'] = $table;
             self::$cache[$tableName]['columns'] = [];
             try {
-                foreach (rex_sql::showColumns($tableName) as $column) {
+                $tableDbId = static::get($tableName)->getDatabaseId();
+                foreach (rex_sql::showColumns($tableName, $tableDbId) as $column) {
                     if ('id' !== $column['name']) {
                         self::$cache[$tableName]['columns'][$column['name']] = $column;
                     }
diff --git a/plugins/manager/lib/yform/manager/table/api.php b/plugins/manager/lib/yform/manager/table/api.php
index 26c27fe2..48e39780 100644
--- a/plugins/manager/lib/yform/manager/table/api.php
+++ b/plugins/manager/lib/yform/manager/table/api.php
@@ -27,6 +27,7 @@ public static function setTable(array $table, array $table_fields = []): ?rex_yf
             $table_insert->setDebug(self::$debug);
             $table_insert->setTable(rex_yform_manager_table::table());
             $table_insert->setValue('table_name', $table_name);
+            $table_insert->setValue('db_id', $table['db_id'] ?? 1);
 
             if (!isset($table['name']) || '' == $table['name']) {
                 $table['name'] = $table['table_name'];
@@ -245,9 +246,9 @@ public static function removeTablefield(string $table_name, string $field_name):
     /**
      * @throws rex_sql_exception
      */
-    public static function migrateTable(string $table_name, bool $schema_overwrite = false): void
+    public static function migrateTable(string $table_name, bool $schema_overwrite = false, int $db_id = 1): void
     {
-        $columns = rex_sql::showColumns($table_name);
+        $columns = rex_sql::showColumns($table_name, $db_id);
 
         if (0 == count($columns)) {
             throw new Exception('`' . $table_name . '` does not exists or no fields available');
@@ -257,6 +258,7 @@ public static function migrateTable(string $table_name, bool $schema_overwrite =
             'table_name' => $table_name,
             'status' => 1,
             'schema_overwrite' => $schema_overwrite ? 1 : 0,
+            'db_id' => $db_id,
         ];
 
         $error = true;
@@ -393,7 +395,8 @@ public static function migrateField(string $table_name, array $column): array
 
             case 'tinyint':
                 if (1 == $column['length']) {
-                    $sql = rex_sql::factory();
+                    $db_id = rex_yform_manager_table::get($table_name)->getDatabaseId();
+                    $sql = rex_sql::factory($db_id);
                     $sql->setQuery('SELECT * FROM ' . $sql->escapeIdentifier($table_name) . ' WHERE ' . $sql->escapeIdentifier($column['name']) . ' NOT IN (0, 1) LIMIT 1');
                     if (!$sql->getRows()) {
                         $fields[] = [
@@ -562,7 +565,7 @@ public static function generateTableAndFields(rex_yform_manager_table $table, bo
             return;
         }
 
-        $c = rex_sql::factory();
+        $c = rex_sql::factory($table->getDatabaseId());
         $c->setDebug(self::$debug);
         $c->setQuery('CREATE TABLE IF NOT EXISTS `' . $table->getTableName() . '` ( `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;');
 
@@ -573,7 +576,7 @@ public static function generateTableAndFields(rex_yform_manager_table $table, bo
         // remember fields, create and in case delete
         $savedColumns = $table->getColumns();
 
-        $EnsureTable = rex_sql_table::get($table->getTableName());
+        $EnsureTable = rex_sql_table::get($table->getTableName(), $table->getDatabaseId());
 
         $EnsureTable
             ->ensurePrimaryIdColumn();
diff --git a/plugins/manager/lib/yform/value/be_link.php b/plugins/manager/lib/yform/value/be_link.php
index b035f405..c6f87fc9 100644
--- a/plugins/manager/lib/yform/value/be_link.php
+++ b/plugins/manager/lib/yform/value/be_link.php
@@ -99,7 +99,9 @@ public static function isArticleInUse(rex_extension_point $ep)
                     }
                     $messages = '';
                     foreach ($tables as $tableName => $conditions) {
-                        $items = $sql->getArray('SELECT `id` FROM ' . $tableName . ' WHERE ' . implode(' OR ', $conditions));
+                        $databaseId = rex_yform_manager_table::get($tableName)?->getDatabaseId() ?? 1;
+                        $tableSql = rex_sql::factory($databaseId);
+                        $items = $tableSql->getArray('SELECT `id` FROM ' . $tableName . ' WHERE '.implode(' OR ', $conditions));
                         if (count($items)) {
                             foreach ($items as $item) {
                                 $sqlData = \rex_sql::factory();
diff --git a/plugins/manager/lib/yform/value/be_manager_relation.php b/plugins/manager/lib/yform/value/be_manager_relation.php
index e6af2a6c..6a3f7145 100644
--- a/plugins/manager/lib/yform/value/be_manager_relation.php
+++ b/plugins/manager/lib/yform/value/be_manager_relation.php
@@ -459,7 +459,8 @@ public function postSave(): void
 
         $values = array_map('intval', $values);
 
-        $sql = rex_sql::factory();
+        $databaseId = rex_yform_manager_table::get($relationTable)->getDatabaseId();
+        $sql = rex_sql::factory($databaseId);
         $sql->setDebug($this->params['debug']);
         $relationTablePreEditValues = $this->getRelationTableValues();
         foreach ($values as $value) {
@@ -553,7 +554,8 @@ public static function getListValue($params)
                         $relationTableFields = self::getRelationTableFieldsForTables($field['table_name'], $field['relation_table'], $field['table']);
 
                         if (isset($relationTableFields['source']) && '' != $relationTableFields['source'] && isset($relationTableFields['target']) && '' != $relationTableFields['target']) {
-                            $sql = rex_sql::factory();
+                            $databaseId = rex_yform_manager_table::get($field['relation_table'])->getDatabaseId();
+                            $sql = rex_sql::factory($databaseId);
                             $sql->setQuery(
                                 '
                             SELECT ' . $sql->escapeIdentifier($relationTableFields['target']) . ' as id
@@ -599,7 +601,7 @@ public static function getListValues($table, $field, array $filter = [])
         if (!isset(self::$yform_list_values[$table][$field][$filterHash])) {
             $tableObject = rex_yform_manager_table::get($table);
             self::$yform_list_values[$table][$field][$filterHash] = [];
-            $db = rex_sql::factory();
+            $db = rex_sql::factory($tableObject->getDatabaseId());
             // $db->setDebug();
             $where = '';
             $join = '';
@@ -707,7 +709,8 @@ private static function getFilterArray($rawFilter, $table, callable $getValueFor
                         $relation = rex_yform_manager_table::get($table)->getRelation($value[0]);
                         $value[0] = $getValueForKey($value[0]);
                         if ($value[0] && $relation) {
-                            $relationSql = rex_sql::factory();
+                            $databaseId = rex_yform_manager_table::get($relation['table'])->getDatabaseId();
+                            $relationSql = rex_sql::factory($databaseId);
                             // $relationSql->debugsql = true;
                             $tables = '' . $relationSql->escapeIdentifier($relation['table']) . ' t0';
                             for ($i = 1; $i < count($value) - 1; ++$i) {
@@ -764,7 +767,8 @@ protected function getRelationTableValues()
         $values = [];
         $relationTableFields = $this->getRelationTableFields();
         if ($relationTableFields['source'] && $relationTableFields['target']) {
-            $sql = rex_sql::factory();
+            $databaseId = rex_yform_manager_table::get($this->getElement('relation_table'))->getDatabaseId();
+            $sql = rex_sql::factory($databaseId);
             $sql->setDebug($this->params['debug']);
             $sql->setQuery(
                 '
@@ -838,7 +842,7 @@ public static function getSearchFilter($params)
 
         /** @var rex_yform_manager_field $field */
         $field = $params['field'];
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($query->getTable()->getDatabaseId());
 
         if (!$field->getElement('relation_table')) {
             return $query->whereListContains($query->getTableAlias() . '.' . $field->getName(), $values);
diff --git a/plugins/manager/lib/yform/value/be_media.php b/plugins/manager/lib/yform/value/be_media.php
index 2b5f8f11..2e2ecf40 100644
--- a/plugins/manager/lib/yform/value/be_media.php
+++ b/plugins/manager/lib/yform/value/be_media.php
@@ -141,7 +141,9 @@ public static function isMediaInUse(rex_extension_point $ep)
 
         $messages = '';
         foreach ($tables as $tableName => $conditions) {
-            $items = $sql->getArray('SELECT `id` FROM ' . $tableName . ' WHERE ' . implode(' OR ', $conditions));
+            $databaseId = rex_yform_manager_table::get($tableName)->getDatabaseId();
+            $mediaSql = rex_sql::factory($databaseId);
+            $items = $mediaSql->getArray('SELECT `id` FROM ' . $tableName . ' WHERE ' . implode(' OR ', $conditions));
             if (count($items)) {
                 foreach ($items as $item) {
                     $sqlData = \rex_sql::factory();
diff --git a/plugins/manager/lib/yform/value/prio.php b/plugins/manager/lib/yform/value/prio.php
index 3a591d86..5c9202c0 100644
--- a/plugins/manager/lib/yform/value/prio.php
+++ b/plugins/manager/lib/yform/value/prio.php
@@ -21,7 +21,7 @@ public function enterObject()
             $options[''] = rex_i18n::msg('yform_prio_bottom');
         } else {
             $this->preEditScopeWhere = $scopeWhere;
-            $sql = rex_sql::factory();
+            $sql = rex_sql::factory($this->params['db_id']);
             if ($this->debug) {
                 $sql->setDebug();
             }
@@ -113,7 +113,7 @@ public function getDefinitions(): array
 
     public function postAction(): void
     {
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($this->params['db_id']);
         if ($this->debug) {
             $sql->setDebug();
         }
@@ -139,7 +139,7 @@ public function postAction(): void
 
     protected function getScopeWhere()
     {
-        $sql = rex_sql::factory();
+        $sql = rex_sql::factory($this->params['db_id']);
         $scope = $this->getElement('scope');
         if (!is_array($scope) && $scope) {
             $scope = array_filter(explode(',', $scope));
@@ -154,7 +154,7 @@ protected function getScopeWhere()
             } elseif (isset($this->params['sql_object']) && $this->params['sql_object']->hasValue($column)) {
                 $value = $this->params['sql_object']->getValue($column);
             } elseif ($this->params['main_id'] > 0) {
-                $sql = rex_sql::factory();
+                $sql = rex_sql::factory($this->params['db_id']);
                 if ($this->debug) {
                     $sql->setDebug();
                 }
diff --git a/plugins/manager/pages/data_import.php b/plugins/manager/pages/data_import.php
index bcc2ae59..02d49533 100644
--- a/plugins/manager/pages/data_import.php
+++ b/plugins/manager/pages/data_import.php
@@ -127,9 +127,7 @@
                                     break;
                                 }
                                 if (2 == $missing_columns) {
-                                    $i = rex_sql::factory();
-
-                                    foreach ($mc as $mcc) {
+                                      foreach ($mc as $mcc) {
                                         rex_sql::factory()
                                             ->setTable(rex_yform_manager_field::table())
                                             ->setValue('table_name', $this->table->getTablename())
diff --git a/plugins/manager/pages/table_edit.php b/plugins/manager/pages/table_edit.php
index ef983a83..4a2d9248 100644
--- a/plugins/manager/pages/table_edit.php
+++ b/plugins/manager/pages/table_edit.php
@@ -7,6 +7,46 @@
  * @author <a href="http://www.yakamara.de">www.yakamara.de</a>
  */
 
+/**
+ * Add a database selection choice to $form if $fieldEnabled is true, show the configured database from $table by
+ * adding a hidden and a show value field to $form if $fieldEnabled is false.
+ *
+ * @param rex_yform                    $form         Form to add the select field to.
+ * @param array<int, array{
+ *           host: string, login: string, password: string, name: string,
+ *           persistent: bool, ssl_key: ?string, ssl_cert: ?string, ssl_ca: ?string
+ *        }                            $dbConfigs    Array with DB configurations from rex_config
+ * @param bool                         $fieldEnabled [optional] Defaults to true. Set false to disable the select
+ *                                                   field.
+ * @param rex_yform_manager_table|null $table        [optional] Defaults to null. Pass the table object, when
+ *                                                   $fieldEnabled is set to false
+ *
+ * @return void
+ */
+function databaseSelectionChoiceOrShow(rex_yform $form, array $dbConfigs, bool $fieldEnabled = true, ?rex_yform_manager_table $table = null): void
+{
+    $databaseChoices = [];
+    foreach ($dbConfigs as $dbId => $dbConfig) {
+        $databaseChoices[$dbId] = "DB {$dbId}: Host »{$dbConfig['host']}«";
+    }
+
+    if (true !== $fieldEnabled) {
+        $form->setHiddenField('db_id', $table->getDatabaseId());
+        $form->setValueField('showvalue', [
+            'db_id',
+            rex_i18n::msg('yform_manager_database_selection'),
+            1,
+            $databaseChoices[$table->getDatabaseId()],
+        ]);
+    } else {
+        $form->setValueField('choice', [
+            'name'    => 'db_id',
+            'label'   => rex_i18n::msg('yform_manager_database_selection'),
+            'choices' => $databaseChoices,
+        ]);
+    }
+}
+
 echo rex_view::title(rex_i18n::msg('yform'));
 $_csrf_key = 'yform_table_edit';
 
@@ -66,6 +106,7 @@
     }
 } elseif (('add' == $func || 'edit' == $func) && rex::getUser()->isAdmin()) {
     $table = null;
+    $dbConfigs = rex_yform::getDatabaseConfigurations();
     if ('edit' == $func) {
         $table = rex_yform_manager_table::getById($table_id);
         if (!$table) {
@@ -90,6 +131,9 @@
     $yform->setValueField('html', ['html' => '<div class="row"><div class="col-md-6">']);
     $yform->setValueField('html', ['html' => '<label>' . rex_i18n::msg('yform_manager_table_basic_info') . '</label>']);
     $yform->setValueField('checkbox', ['status', rex_i18n::msg('yform_tbl_active')]);
+    if (count($dbConfigs) > 1) {
+        databaseSelectionChoiceOrShow($yform, $dbConfigs, 'add' === $func, $table);
+    }
     $yform->setValueField('prio', ['prio', rex_i18n::msg('yform_manager_table_prio'), 'name']);
 
     switch ($func) {
diff --git a/plugins/manager/pages/table_migrate.php b/plugins/manager/pages/table_migrate.php
index 4b835023..f186f41e 100644
--- a/plugins/manager/pages/table_migrate.php
+++ b/plugins/manager/pages/table_migrate.php
@@ -12,9 +12,24 @@
 
 $page = rex_request('page', 'string', '');
 
-$available_tables = rex_sql::factory()->getTablesAndViews();
+$dbConfigs = rex_yform::getDatabaseConfigurations();
+/** @var array<int,array{db: int, table: string}> $available_tables */
+$available_tables = [];
+foreach ($dbConfigs as $dbId => $dbConfig) {
+    $available_tables = array_merge_recursive(
+        $available_tables,
+        array_map(
+            fn($tableName) => [
+                'db'    => $dbId,
+                'table' => $tableName,
+            ],
+            rex_sql::factory($dbId)->getTablesAndViews()
+        )
+    );
+}
 
 $yform_tables = [];
+/** @var array<int,array{db: int, table: string}> $missing_tables */
 $missing_tables = [];
 
 foreach (rex_yform_manager_table::getAll() as $g_table) {
@@ -22,25 +37,39 @@
 }
 
 foreach ($available_tables as $a_table) {
-    if (!in_array($a_table, $yform_tables)) {
-        $missing_tables[$a_table] = $a_table;
+    if (!in_array($a_table['table'], $yform_tables)) {
+        $missing_tables[$a_table['table']] = $a_table;
     }
 }
+$missingTableChoices = [];
+$doPrefixDb = count($dbConfigs) > 1;
+foreach ($missing_tables as $missingTable) {
+    $missingTableChoices[$missingTable['table']] = $doPrefixDb
+        ? "DB{$missingTable['db']}: {$missingTable['table']}"
+        : $missingTable['table'];
+}
+asort($missingTableChoices);
 
 $yform = new rex_yform();
 $yform->setObjectparams('form_showformafterupdate', 1);
 $yform->setObjectparams('form_name', $_csrf_key);
 $yform->setHiddenField('page', $page);
-$yform->setValueField('choice', ['name' => 'table_name', 'label' => rex_i18n::msg('yform_table'), 'choices' => $missing_tables]);
+$yform->setValueField('choice', ['name' => 'table_name', 'label' => rex_i18n::msg('yform_table'), 'choices' => $missingTableChoices]);
 $yform->setValueField('checkbox', ['schema_overwrite', rex_i18n::msg('yform_manager_table_schema_overwrite')]);
 $form = $yform->getForm();
 
 if ($yform->objparams['actions_executed']) {
     $table_name = (string) $yform->objparams['value_pool']['sql']['table_name'];
     $schema_overwrite = (int) $yform->objparams['value_pool']['sql']['schema_overwrite'];
+    $selectedTable = array_filter($missing_tables, fn($missingTable) => $missingTable['table'] === $table_name);
+    $databaseId = array_shift($selectedTable)['db'] ?? 1;
 
     try {
-        rex_yform_manager_table_api::migrateTable($table_name, (0 == $schema_overwrite) ? false : true); // with convert id / auto_increment finder
+        rex_yform_manager_table_api::migrateTable(
+            $table_name,
+            (0 == $schema_overwrite) ? false : true, // with convert id / auto_increment finder
+            $databaseId
+        );
         echo rex_view::success(rex_i18n::msg('yform_manager_table_migrated_success'));
 
         unset($missing_tables[$table_name]);
@@ -48,7 +77,7 @@
         $yform = new rex_yform();
         $yform->setObjectparams('form_showformafterupdate', 1);
         $yform->setHiddenField('page', $page);
-        $yform->setValueField('choice', ['name' => 'table_name', 'label' => rex_i18n::msg('yform_table'), 'choices' => $missing_tables]);
+        $yform->setValueField('choice', ['name' => 'table_name', 'label' => rex_i18n::msg('yform_table'), 'choices' => $missingTableChoices]);
         $yform->setValueField('checkbox', ['schema_overwrite', rex_i18n::msg('yform_manager_table_schema_overwrite')]);
         $form = $yform->getForm();
     } catch (Exception $e) {
diff --git a/tests/rex_yform_yorm_test.php b/tests/rex_yform_yorm_test.php
index 3e26951e..fa12a8c0 100644
--- a/tests/rex_yform_yorm_test.php
+++ b/tests/rex_yform_yorm_test.php
@@ -23,6 +23,7 @@ public static function setUpTable($tableName)
         $table = rex_yform_manager_table_api::setTable(
             [
                 'table_name' => $tableName,
+                'db_id' => 1,
                 'name' => 'Name of Table - ' . $tableName,
                 'description' => 'Description of Table - ' . $tableName,
                 'status' => 1,