diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/DeviceManagementRepository.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/DeviceManagementRepository.java
index 8b8e22b75e..596d1202a0 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/DeviceManagementRepository.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/DeviceManagementRepository.java
@@ -45,12 +45,6 @@ public class DeviceManagementRepository {
 
     public void removeDeviceManagementProvider(DeviceMgtService provider) throws DeviceManagementException {
         String deviceType = provider.getProviderType();
-        try {
-            DeviceManagerUtil.unregisterDeviceType(deviceType);
-        } catch (DeviceManagementException e) {
-            throw new DeviceManagementException("Error occurred while removing device management provider '" +
-                    deviceType + "'", e);
-        }
         providers.remove(deviceType);
     }
 
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/internal/DeviceManagementServiceComponent.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/internal/DeviceManagementServiceComponent.java
index 661eb61693..54b279bc45 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/internal/DeviceManagementServiceComponent.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/internal/DeviceManagementServiceComponent.java
@@ -266,7 +266,7 @@ public class DeviceManagementServiceComponent {
 	 */
 	protected void unsetDeviceManager(DeviceMgtService deviceManager) {
 		if (log.isDebugEnabled()) {
-			log.debug("Unsetting Device Management Service Provider : '" + deviceManager.getProviderType() + "'");
+			log.debug("Un setting Device Management Service Provider : '" + deviceManager.getProviderType() + "'");
 		}
         try {
             this.getPluginRepository().removeDeviceManagementProvider(deviceManager);
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationDAOImpl.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationDAOImpl.java
index fdf39f8ddf..35f0f0cd10 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationDAOImpl.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/OperationDAOImpl.java
@@ -66,7 +66,6 @@ public class OperationDAOImpl implements OperationDAO {
             throw new OperationManagementDAOException("Error occurred while adding operation metadata", e);
         } finally {
             OperationManagementDAOUtil.cleanupResources(stmt, rs);
-            OperationManagementDAOFactory.closeConnection();
         }
     }
 
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/util/DeviceManagerUtil.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/util/DeviceManagerUtil.java
index f716bf6e2e..308ed6813f 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/util/DeviceManagerUtil.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/util/DeviceManagerUtil.java
@@ -142,7 +142,7 @@ public final class DeviceManagerUtil {
         try {
             DeviceTypeDAO deviceTypeDAO = DeviceManagementDAOFactory.getDeviceTypeDAO();
             DeviceType deviceType = deviceTypeDAO.getDeviceType(typeName);
-            if (deviceType == null) {
+            if (deviceType != null) {
                 DeviceType dt = new DeviceType();
                 dt.setName(typeName);
                 deviceTypeDAO.removeDeviceType(typeName);
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/test/resources/sql/h2.sql b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/test/resources/sql/h2.sql
index d15a958212..83a5410439 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/test/resources/sql/h2.sql
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/test/resources/sql/h2.sql
@@ -27,7 +27,7 @@ CREATE TABLE IF NOT EXISTS DM_OPERATION (
     CREATED_TIMESTAMP TIMESTAMP NOT NULL,
     RECEIVED_TIMESTAMP TIMESTAMP NULL,
     STATUS VARCHAR(50) NULL,
-    OPERATION_CODE VARCHAR(25) NOT NULL,
+    OPERATION_CODE VARCHAR(1000) NOT NULL,
     PRIMARY KEY (ID)
 );
 
diff --git a/features/device-mgt/org.wso2.carbon.device.mgt.server.feature/src/main/resources/dbscripts/cdm/h2.sql b/features/device-mgt/org.wso2.carbon.device.mgt.server.feature/src/main/resources/dbscripts/cdm/h2.sql
index 14f3265dd3..57845c0d5e 100644
--- a/features/device-mgt/org.wso2.carbon.device.mgt.server.feature/src/main/resources/dbscripts/cdm/h2.sql
+++ b/features/device-mgt/org.wso2.carbon.device.mgt.server.feature/src/main/resources/dbscripts/cdm/h2.sql
@@ -27,7 +27,7 @@ CREATE TABLE IF NOT EXISTS DM_OPERATION (
     CREATED_TIMESTAMP TIMESTAMP NOT NULL,
     RECEIVED_TIMESTAMP TIMESTAMP NULL,
     STATUS VARCHAR(50) NULL,
-    OPERATION_CODE VARCHAR(25) NOT NULL,
+    OPERATION_CODE VARCHAR(1000) NOT NULL,
     PRIMARY KEY (ID)
 );