diff --git a/src/ActiveQuery.php b/src/ActiveQuery.php
index ada8b7b9e..6f27d45a3 100644
--- a/src/ActiveQuery.php
+++ b/src/ActiveQuery.php
@@ -93,6 +93,19 @@ public function init()
         $this->trigger(self::EVENT_INIT);
     }
 
+    /**
+     * Returns the connection used by this ActiveQuery.
+     * @param Connection $db Mongo connection.
+     * @return Connection connection instance.
+     */
+    public function getDb($db = null){
+        if($db !== null){
+            return $db;
+        }
+        $modelClass = $this->modelClass;
+        return $modelClass::getDb();
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -183,15 +196,13 @@ public function modify($update, $options = [], $db = null)
     public function getCollection($db = null)
     {
         /* @var $modelClass ActiveRecord */
-        $modelClass = $this->modelClass;
-        if ($db === null) {
-            $db = $modelClass::getDb();
-        }
+
         if ($this->from === null) {
+            $modelClass = $this->modelClass;
             $this->from = $modelClass::collectionName();
         }
 
-        return $db->getCollection($this->from);
+        return $this->getDb()->getCollection($this->from);
     }
 
     /**
diff --git a/src/BatchQueryResult.php b/src/BatchQueryResult.php
index 23f268959..d2c7c5c4c 100644
--- a/src/BatchQueryResult.php
+++ b/src/BatchQueryResult.php
@@ -129,9 +129,12 @@ protected function fetchData()
                 // @see https://jira.mongodb.org/browse/PHP-457
                 $this->query->addOptions(['batchSize' => $this->batchSize]);
             }
-            $cursor = $this->query->buildCursor($this->db);
-            $token = 'fetch cursor id = ' . $cursor->getId();
-            Yii::info($token, __METHOD__);
+            $db = $this->db === null ? yii::$app->mongodb : $this->db;
+            $cursor = $this->query->buildCursor($db);
+            if($db->enableLogging){
+                $token = 'fetch cursor id = ' . $cursor->getId();
+                Yii::info($token, __METHOD__);
+            }
 
             if ($cursor instanceof \Iterator) {
                 $this->_iterator = $cursor;
diff --git a/src/Connection.php b/src/Connection.php
index 590f29d82..7b160a183 100644
--- a/src/Connection.php
+++ b/src/Connection.php
@@ -349,17 +349,25 @@ public function open()
             }
             $token = 'Opening MongoDB connection: ' . $this->dsn;
             try {
-                Yii::trace($token, __METHOD__);
-                Yii::beginProfile($token, __METHOD__);
+                if ($this->enableLogging) {
+                    Yii::trace($token, __METHOD__);
+                }
+                if ($this->enableProfiling) {
+                    Yii::beginProfile($token, __METHOD__);
+                }
                 $options = $this->options;
 
                 $this->manager = new Manager($this->dsn, $options, $this->driverOptions);
                 $this->manager->selectServer($this->manager->getReadPreference());
 
                 $this->initConnection();
-                Yii::endProfile($token, __METHOD__);
+                if ($this->enableProfiling) {
+                    Yii::endProfile($token, __METHOD__);
+                }
             } catch (\Exception $e) {
-                Yii::endProfile($token, __METHOD__);
+                if ($this->enableProfiling) {
+                    Yii::endProfile($token, __METHOD__);
+                }
                 throw new Exception($e->getMessage(), (int) $e->getCode(), $e);
             }
 
diff --git a/src/Query.php b/src/Query.php
index f1a8c2386..353ca8150 100644
--- a/src/Query.php
+++ b/src/Query.php
@@ -60,6 +60,14 @@ class Query extends Component implements QueryInterface
      */
     public $options = [];
 
+    /**
+     * Returns the connection used by this Query.
+     * @param Connection $db Mongo connection.
+     * @return Connection connection instance.
+     */
+    public function getDb($db = null){
+        return $db === null ? Yii::$app->get('mongodb') : $db;
+    }
 
     /**
      * Returns the Mongo collection for this query.
@@ -68,11 +76,7 @@ class Query extends Component implements QueryInterface
      */
     public function getCollection($db = null)
     {
-        if ($db === null) {
-            $db = Yii::$app->get('mongodb');
-        }
-
-        return $db->getCollection($this->from);
+        return $this->getDb($db)->getCollection($this->from);
     }
 
     /**
@@ -203,25 +207,33 @@ public function buildCursor($db = null)
 
     /**
      * Fetches rows from the given Mongo cursor.
-     * @param \MongoDB\Driver\Cursor $cursor Mongo cursor instance to fetch data from.
      * @param bool $all whether to fetch all rows or only first one.
-     * @param string|callable $indexBy the column name or PHP callback,
-     * by which the query results should be indexed by.
+     * @param yii\mongodb\Connection $db the MongoDB connection used to fetch rows.
      * @throws Exception on failure.
      * @return array|bool result.
      */
-    protected function fetchRows($cursor, $all = true, $indexBy = null)
+    protected function fetchRows($all = true, $db = null)
     {
+        $db = $this->getDb($db);
+        $cursor = $this->buildCursor($db);
         $token = 'fetch cursor id = ' . $cursor->getId();
-        Yii::info($token, __METHOD__);
+        if ($db->enableLogging) {
+            Yii::info($token, __METHOD__);
+        }
         try {
-            Yii::beginProfile($token, __METHOD__);
+            if ($db->enableProfiling) {
+                Yii::beginProfile($token, __METHOD__);
+            }
             $result = $this->fetchRowsInternal($cursor, $all);
-            Yii::endProfile($token, __METHOD__);
+            if ($db->enableProfiling) {
+                Yii::endProfile($token, __METHOD__);
+            }
 
             return $result;
         } catch (\Exception $e) {
-            Yii::endProfile($token, __METHOD__);
+            if ($db->enableProfiling) {
+                Yii::endProfile($token, __METHOD__);
+            }
             throw new Exception($e->getMessage(), (int) $e->getCode(), $e);
         }
     }
@@ -278,7 +290,7 @@ public function batch($batchSize = 100, $db = null)
             'class' => BatchQueryResult::className(),
             'query' => $this,
             'batchSize' => $batchSize,
-            'db' => $db,
+            'db' => $this->getDb($db),
             'each' => false,
         ]);
     }
@@ -306,7 +318,7 @@ public function each($batchSize = 100, $db = null)
             'class' => BatchQueryResult::className(),
             'query' => $this,
             'batchSize' => $batchSize,
-            'db' => $db,
+            'db' => $this->getDb($db),
             'each' => true,
         ]);
     }
@@ -322,8 +334,7 @@ public function all($db = null)
         if (!empty($this->emulateExecution)) {
             return [];
         }
-        $cursor = $this->buildCursor($db);
-        $rows = $this->fetchRows($cursor, true, $this->indexBy);
+        $rows = $this->fetchRows(true, $db);
         return $this->populate($rows);
     }
 
@@ -358,8 +369,7 @@ public function one($db = null)
         if (!empty($this->emulateExecution)) {
             return false;
         }
-        $cursor = $this->buildCursor($db);
-        return $this->fetchRows($cursor, false);
+        return $this->fetchRows(false, $db);
     }
 
     /**
@@ -384,8 +394,7 @@ public function scalar($db = null)
             $this->select['_id'] = false;
         }
 
-        $cursor = $this->buildCursor($db);
-        $row = $this->fetchRows($cursor, false);
+        $row = $this->fetchRows(false, $db);
 
         if (empty($row)) {
             return false;
@@ -417,8 +426,7 @@ public function column($db = null)
             $this->select[] = $this->indexBy;
         }
 
-        $cursor = $this->buildCursor($db);
-        $rows = $this->fetchRows($cursor, true);
+        $rows = $this->fetchRows(true, $db);
 
         if (empty($rows)) {
             return [];