diff --git a/extensions/mongo/ActiveQuery.php b/extensions/mongo/ActiveQuery.php
index 9b7e207..9031723 100644
--- a/extensions/mongo/ActiveQuery.php
+++ b/extensions/mongo/ActiveQuery.php
@@ -29,10 +29,7 @@ class ActiveQuery extends Query implements ActiveQueryInterface
 	public function all($db = null)
 	{
 		$cursor = $this->buildCursor($db);
-		$rows = [];
-		foreach ($cursor as $row) {
-			$rows[] = $row;
-		}
+		$rows = $this->fetchRows($cursor);
 		if (!empty($rows)) {
 			$models = $this->createModels($rows);
 			if (!empty($this->with)) {
diff --git a/extensions/mongo/Collection.php b/extensions/mongo/Collection.php
index 64242c1..aeae8a9 100644
--- a/extensions/mongo/Collection.php
+++ b/extensions/mongo/Collection.php
@@ -173,9 +173,12 @@ class Collection extends Object
 	}
 
 	/**
-	 * @param array $condition
-	 * @param array $fields
-	 * @return \MongoCursor
+	 * Returns a cursor for the search results.
+	 * In order to perform "find" queries use [[Query]] class.
+	 * @param array $condition query condition
+	 * @param array $fields fields to be selected
+	 * @return \MongoCursor cursor for the search results
+	 * @see Query
 	 */
 	public function find($condition = [], $fields = [])
 	{
@@ -183,21 +186,6 @@ class Collection extends Object
 	}
 
 	/**
-	 * @param array $condition
-	 * @param array $fields
-	 * @return array
-	 */
-	public function findAll($condition = [], $fields = [])
-	{
-		$cursor = $this->find($condition, $fields);
-		$result = [];
-		foreach ($cursor as $data) {
-			$result[] = $data;
-		}
-		return $result;
-	}
-
-	/**
 	 * Inserts new data into collection.
 	 * @param array|object $data data to be inserted.
 	 * @param array $options list of options in format: optionName => optionValue.
diff --git a/extensions/mongo/Query.php b/extensions/mongo/Query.php
index 16fd8db..1a00b08 100644
--- a/extensions/mongo/Query.php
+++ b/extensions/mongo/Query.php
@@ -10,6 +10,7 @@ namespace yii\mongo;
 use yii\base\Component;
 use yii\db\QueryInterface;
 use yii\db\QueryTrait;
+use yii\helpers\Json;
 use Yii;
 
 /**
@@ -104,6 +105,48 @@ class Query extends Component implements QueryInterface
 	}
 
 	/**
+	 * @param \MongoCursor $cursor Mongo cursor instance to fetch data from.
+	 * @param boolean $all whether to fetch all rows or only first one.
+	 * @param string|callable $indexBy
+	 * @throws Exception
+	 * @return array|boolean
+	 */
+	protected function fetchRows(\MongoCursor $cursor, $all = true, $indexBy = null)
+	{
+		$token = 'Querying: ' . Json::encode($cursor->info());
+		Yii::info($token, __METHOD__);
+		try {
+			Yii::beginProfile($token, __METHOD__);
+			$result = [];
+			if ($all) {
+				foreach ($cursor as $row) {
+					if ($indexBy !== null) {
+						if (is_string($indexBy)) {
+							$key = $row[$indexBy];
+						} else {
+							$key = call_user_func($indexBy, $row);
+						}
+						$result[$key] = $row;
+					} else {
+						$result[] = $row;
+					}
+				}
+			} else {
+				if ($cursor->hasNext()) {
+					$result = $cursor->getNext();
+				} else {
+					$result = false;
+				}
+			}
+			Yii::endProfile($token, __METHOD__);
+			return $result;
+		} catch (\Exception $e) {
+			Yii::endProfile($token, __METHOD__);
+			throw new Exception($e->getMessage(), (int)$e->getCode(), $e);
+		}
+	}
+
+	/**
 	 * Executes the query and returns all results as an array.
 	 * @param Connection $db the Mongo connection used to execute the query.
 	 * If this parameter is not given, the `mongo` application component will be used.
@@ -112,20 +155,7 @@ class Query extends Component implements QueryInterface
 	public function all($db = null)
 	{
 		$cursor = $this->buildCursor($db);
-		$result = [];
-		foreach ($cursor as $row) {
-			if ($this->indexBy !== null) {
-				if (is_string($this->indexBy)) {
-					$key = $row[$this->indexBy];
-				} else {
-					$key = call_user_func($this->indexBy, $row);
-				}
-				$result[$key] = $row;
-			} else {
-				$result[] = $row;
-			}
-		}
-		return $result;
+		return $this->fetchRows($cursor, true, $this->indexBy);
 	}
 
 	/**
@@ -138,11 +168,7 @@ class Query extends Component implements QueryInterface
 	public function one($db = null)
 	{
 		$cursor = $this->buildCursor($db);
-		if ($cursor->hasNext()) {
-			return $cursor->getNext();
-		} else {
-			return false;
-		}
+		return $this->fetchRows($cursor, false);
 	}
 
 	/**
@@ -151,11 +177,22 @@ class Query extends Component implements QueryInterface
 	 * @param Connection $db the Mongo connection used to execute the query.
 	 * If this parameter is not given, the `mongo` application component will be used.
 	 * @return integer number of records
+	 * @throws Exception on failure.
 	 */
 	public function count($q = '*', $db = null)
 	{
 		$cursor = $this->buildCursor($db);
-		return $cursor->count();
+		$token = 'Counting: ' . Json::encode($cursor->info());
+		Yii::info($token, __METHOD__);
+		try {
+			Yii::beginProfile($token, __METHOD__);
+			$result = $cursor->count();
+			Yii::endProfile($token, __METHOD__);
+			return $result;
+		} catch (\Exception $e) {
+			Yii::endProfile($token, __METHOD__);
+			throw new Exception($e->getMessage(), (int)$e->getCode(), $e);
+		}
 	}
 
 	/**
diff --git a/tests/unit/extensions/mongo/CollectionTest.php b/tests/unit/extensions/mongo/CollectionTest.php
index bc13b2e..a50177d 100644
--- a/tests/unit/extensions/mongo/CollectionTest.php
+++ b/tests/unit/extensions/mongo/CollectionTest.php
@@ -45,6 +45,7 @@ class CollectionTest extends MongoTestCase
 
 	/**
 	 * @depends testInsert
+	 * @depends testFind
 	 */
 	public function testFindAll()
 	{
@@ -55,7 +56,11 @@ class CollectionTest extends MongoTestCase
 		];
 		$id = $collection->insert($data);
 
-		$rows = $collection->findAll();
+		$cursor = $collection->find();
+		$rows = [];
+		foreach ($cursor as $row) {
+			$rows[] = $row;
+		}
 		$this->assertEquals(1, count($rows));
 		$this->assertEquals($id, $rows[0]['_id']);
 	}
@@ -129,7 +134,7 @@ class CollectionTest extends MongoTestCase
 		$count = $collection->remove(['_id' => $id]);
 		$this->assertEquals(1, $count);
 
-		$rows = $collection->findAll();
+		$rows = $this->findAll($collection);
 		$this->assertEquals(0, count($rows));
 	}
 
@@ -151,7 +156,7 @@ class CollectionTest extends MongoTestCase
 		$count = $collection->update(['_id' => $id], $newData);
 		$this->assertEquals(1, $count);
 
-		list($row) = $collection->findAll();
+		list($row) = $this->findAll($collection);
 		$this->assertEquals($newData['name'], $row['name']);
 	}
 
@@ -221,7 +226,7 @@ class CollectionTest extends MongoTestCase
 		$this->assertEquals('mapReduceOut', $result);
 
 		$outputCollection = $this->getConnection()->getCollection($result);
-		$rows = $outputCollection->findAll();
+		$rows = $this->findAll($outputCollection);
 		$expectedRows = [
 			[
 				'_id' => 1,
diff --git a/tests/unit/extensions/mongo/MongoTestCase.php b/tests/unit/extensions/mongo/MongoTestCase.php
index 27b7b13..e344109 100644
--- a/tests/unit/extensions/mongo/MongoTestCase.php
+++ b/tests/unit/extensions/mongo/MongoTestCase.php
@@ -103,4 +103,21 @@ class MongoTestCase extends TestCase
 			}
 		}
 	}
+
+	/**
+	 * Finds all records in collection.
+	 * @param \yii\mongo\Collection $collection
+	 * @param array $condition
+	 * @param array $fields
+	 * @return array rows
+	 */
+	protected function findAll($collection, $condition = [], $fields = [])
+	{
+		$cursor = $collection->find($condition, $fields);
+		$result = [];
+		foreach ($cursor as $data) {
+			$result[] = $data;
+		}
+		return $result;
+	}
 }
\ No newline at end of file