diff --git a/kiri-engine/Pool/Connection.php b/kiri-engine/Pool/Connection.php
index f06b6dca..7bb08b39 100644
--- a/kiri-engine/Pool/Connection.php
+++ b/kiri-engine/Pool/Connection.php
@@ -131,16 +131,20 @@ class Connection extends Component
 	public function initConnections(array $config, int $max)
 	{
 		$this->pool->initConnections($config['cds'], $max, static function () use ($config) {
+			$options = [
+				PDO::ATTR_CASE               => PDO::CASE_NATURAL,
+				PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+				PDO::ATTR_ORACLE_NULLS       => PDO::NULL_NATURAL,
+				PDO::ATTR_STRINGIFY_FETCHES  => false,
+				PDO::ATTR_EMULATE_PREPARES   => false,
+				PDO::ATTR_TIMEOUT            => $config['connect_timeout'],
+				PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES ' . ($config['charset'] ?? 'utf8mb4')
+			];
+			if (!Context::inCoroutine()) {
+				$options[PDO::ATTR_PERSISTENT] = true;
+			}
 			$link = new PDO('mysql:dbname=' . $config['dbname'] . ';host=' . $config['cds'],
-				$config['username'], $config['password'], [
-					PDO::ATTR_CASE               => PDO::CASE_NATURAL,
-					PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
-					PDO::ATTR_ORACLE_NULLS       => PDO::NULL_NATURAL,
-					PDO::ATTR_STRINGIFY_FETCHES  => false,
-					PDO::ATTR_EMULATE_PREPARES   => false,
-					PDO::ATTR_TIMEOUT            => $config['connect_timeout'],
-					PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES ' . ($config['charset'] ?? 'utf8mb4')
-				]);
+				$config['username'], $config['password'], $options);
 			foreach ($config['attributes'] as $key => $attribute) {
 				$link->setAttribute($key, $attribute);
 			}