diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java
index 89e541615c..d2fb72b90e 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java
@@ -147,8 +147,7 @@ public class OperationManagerImpl implements OperationManager {
     }
 
     @Override
-    public Activity addOperation(Operation operation,
-                                 List<DeviceIdentifier> deviceIds)
+    public Activity addOperation(Operation operation, List<DeviceIdentifier> deviceIds)
             throws OperationManagementException, InvalidDeviceException {
         if (log.isDebugEnabled()) {
             log.debug("operation:[" + operation.toString() + "]");
@@ -160,7 +159,13 @@ public class OperationManagerImpl implements OperationManager {
         try {
             DeviceIDHolder deviceValidationResult = DeviceManagerUtil.validateDeviceIdentifiers(deviceIds);
             List<DeviceIdentifier> validDeviceIds = deviceValidationResult.getValidDeviceIDList();
-            if (validDeviceIds.size() > 0) {
+            if (!validDeviceIds.isEmpty()) {
+                if (log.isDebugEnabled() && deviceIds.get(0).getType() != null) {
+                    log.debug("Adding operation for Device type : " + deviceIds.get(0).getType() + ", tenant ID:"
+                            + PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId() + ", domain:"
+                            + PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantDomain()
+                            + ", device count:" + deviceIds.size() + " operation type:" + operation.getCode());
+                }
                 DeviceIDHolder deviceAuthorizationResult = this.authorizeDevices(operation, validDeviceIds);
                 List<DeviceIdentifier> authorizedDeviceIds = deviceAuthorizationResult.getValidDeviceIDList();
                 if (authorizedDeviceIds.size() <= 0) {
@@ -285,6 +290,11 @@ public class OperationManagerImpl implements OperationManager {
     }
 
     private void sendNotification(Operation operation, Device device) {
+        if (log.isDebugEnabled()) {
+            log.debug("Sending notification for device id: " + device.getDeviceIdentifier() + ", type:" + device
+                    .getType() + ", tenant:" + PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId()
+                    + ", domain:" + PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantDomain());
+        }
         NotificationStrategy notificationStrategy = getNotificationStrategy();
         /*
          * If notification strategy has not enable to send push notification using scheduler task we will send
@@ -315,6 +325,9 @@ public class OperationManagerImpl implements OperationManager {
                     log.error("Error occurred while setting push notification status to SCHEDULED.", ex);
                     OperationManagementDAOFactory.rollbackTransaction();
                 }
+            } catch (Exception e) {
+                log.error("Error occurred while sending notifications to " + device.getType() + " device carrying id '"
+                        + device.getDeviceIdentifier() + "'", e);
             }
         }
     }
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceDetailsRetrieverTask.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceDetailsRetrieverTask.java
index 567964d808..f411c3d9f8 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceDetailsRetrieverTask.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceDetailsRetrieverTask.java
@@ -86,6 +86,10 @@ public class DeviceDetailsRetrieverTask implements Task {
         try {
             List<Integer> tenants = DeviceManagementDataHolder.getInstance().
                     getDeviceManagementProvider().getDeviceEnrolledTenants();
+            if (log.isDebugEnabled()) {
+                log.debug("Task is running for " + tenants.size() + " tenants and the device type is " + deviceType);
+            }
+
             for (Integer tenant : tenants) {
                 String tenantDomain = DeviceManagementDataHolder.getInstance().
                         getRealmService().getTenantManager().getDomain(tenant);
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceTaskManagerImpl.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceTaskManagerImpl.java
index 2132889189..602e656f90 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceTaskManagerImpl.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/task/impl/DeviceTaskManagerImpl.java
@@ -22,6 +22,7 @@ package org.wso2.carbon.device.mgt.core.task.impl;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.wso2.carbon.device.mgt.common.Device;
+import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.DeviceManagementException;
 import org.wso2.carbon.device.mgt.common.InvalidDeviceException;
 import org.wso2.carbon.device.mgt.common.MonitoringOperation;
@@ -84,18 +85,26 @@ public class DeviceTaskManagerImpl implements DeviceTaskManager {
         try {
             List<Device> devices;
             List<String> operations;
-
+            List<DeviceIdentifier> validDeviceIdentifiers;
             operations = this.getValidOperationNames(); //list operations for each device type
             devices = deviceManagementProviderService.getAllDevices(deviceType, false);//list devices for each type
+
             if (!devices.isEmpty()) {
-                if (operations != null && DeviceManagerUtil.getValidDeviceIdentifiers(devices).size() != 0) {
+                if (log.isDebugEnabled() && deviceType != null) {
+                    log.info("Devices exist to add operations and the total number of devices are " + devices.size());
+                }
+                validDeviceIdentifiers = DeviceManagerUtil.getValidDeviceIdentifiers(devices);
+                if (!validDeviceIdentifiers.isEmpty()) {
+                    if (log.isDebugEnabled() && deviceType != null) {
+                        log.debug("Number of valid device identifier size to add operations: " + validDeviceIdentifiers
+                                .size());
+                    }
                     for (String str : operations) {
                         CommandOperation operation = new CommandOperation();
                         operation.setEnabled(true);
                         operation.setType(Operation.Type.COMMAND);
                         operation.setCode(str);
-                        deviceManagementProviderService.addOperation(deviceType, operation,
-                                DeviceManagerUtil.getValidDeviceIdentifiers(devices));
+                        deviceManagementProviderService.addOperation(deviceType, operation, validDeviceIdentifiers);
                     }
                 } else {
                     if (log.isDebugEnabled()) {
@@ -174,4 +183,3 @@ public class DeviceTaskManagerImpl implements DeviceTaskManager {
     }
 
 }
-