diff --git a/src/main/java/com/eactive/apim/portal/portalproperty/repository/PortalPropertyRepository.java b/src/main/java/com/eactive/apim/portal/portalproperty/repository/PortalPropertyRepository.java
index 5a6546e..83a9dd6 100644
--- a/src/main/java/com/eactive/apim/portal/portalproperty/repository/PortalPropertyRepository.java
+++ b/src/main/java/com/eactive/apim/portal/portalproperty/repository/PortalPropertyRepository.java
@@ -4,8 +4,23 @@ import com.eactive.apim.portal.portalproperty.entity.PortalProperty;
 import com.eactive.apim.portal.portalproperty.entity.PortalPropertyId;
 import com.eactive.eai.data.jpa.BaseRepository;
 import com.eactive.eai.rms.data.EMSDataSource;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
 
 @EMSDataSource
 public interface PortalPropertyRepository extends BaseRepository<PortalProperty, PortalPropertyId> {
 
+    /**
+     * (PROPERTY_GROUP_NAME, PROPERTY_NAME) 조합이 2건 이상인 중복 키를 조회한다.
+     * DB에 유니크 제약을 걸지 않으므로 기동 시 무결성 점검용으로 사용한다.
+     *
+     * @return {@code Object[]{propertyGroupName, propertyName, count}} 목록 (중복 없으면 빈 리스트)
+     */
+    @Query("SELECT p.id.propertyGroupName, p.id.propertyName, COUNT(p) "
+            + "FROM PortalProperty p "
+            + "GROUP BY p.id.propertyGroupName, p.id.propertyName "
+            + "HAVING COUNT(p) > 1")
+    List<Object[]> findDuplicatePropertyKeys();
+
 }