diff --git a/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/database/resource/StorageResourceUtils.java b/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/database/resource/StorageResourceUtils.java
index 62fda0c02b2d2..845b681263488 100644
--- a/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/database/resource/StorageResourceUtils.java
+++ b/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/database/resource/StorageResourceUtils.java
@@ -58,14 +58,7 @@ public static Map<String, StorageUnitNodeMapper> getStorageUnitNodeMappers(final
                 .collect(Collectors.toMap(Entry::getKey, entry -> getStorageUnitNodeMapper(entry.getKey(), entry.getValue()), (oldValue, currentValue) -> currentValue, LinkedHashMap::new));
     }
     
-    /**
-     * Get storage unit node mapper from provided data source.
-     *
-     * @param dataSourceName data source name
-     * @param dataSource data source
-     * @return storage unit node mapper
-     */
-    public static StorageUnitNodeMapper getStorageUnitNodeMapper(final String dataSourceName, final DataSource dataSource) {
+    private static StorageUnitNodeMapper getStorageUnitNodeMapper(final String dataSourceName, final DataSource dataSource) {
         DataSourcePoolProperties props = DataSourcePoolPropertiesCreator.create(dataSource);
         String url = props.getConnectionPropertySynonyms().getStandardProperties().get("url").toString();
         return new StorageUnitNodeMapper(dataSourceName, new StorageNode(dataSourceName), url);