diff --git a/extensions/mongo/Collection.php b/extensions/mongo/Collection.php
index e211d08..5b6c829 100644
--- a/extensions/mongo/Collection.php
+++ b/extensions/mongo/Collection.php
@@ -426,11 +426,11 @@ class Collection extends Object
 	 */
 	public function aggregate($pipeline, $pipelineOperator = [])
 	{
-		$token = 'Aggregating from ' . $this->getFullName();
+		$args = func_get_args();
+		$token = $this->composeLogToken('aggregate', $args);
 		Yii::info($token, __METHOD__);
 		try {
 			Yii::beginProfile($token, __METHOD__);
-			$args = func_get_args();
 			$result = call_user_func_array([$this->mongoCollection, 'aggregate'], $args);
 			$this->tryResultError($result);
 			Yii::endProfile($token, __METHOD__);
diff --git a/extensions/mongo/Database.php b/extensions/mongo/Database.php
index fcc733f..bb919b5 100644
--- a/extensions/mongo/Database.php
+++ b/extensions/mongo/Database.php
@@ -9,10 +9,13 @@ namespace yii\mongo;
 
 use yii\base\Object;
 use Yii;
+use yii\helpers\Json;
 
 /**
  * Database represents the Mongo database information.
  *
+ * @property string $name name of this database. This property is read-only.
+ *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 2.0
  */
@@ -32,6 +35,14 @@ class Database extends Object
 	private $_fileCollections = [];
 
 	/**
+	 * @return string name of this database.
+	 */
+	public function getName()
+	{
+		return $this->mongoDb->__toString();
+	}
+
+	/**
 	 * Returns the Mongo collection with the given name.
 	 * @param string $name collection name
 	 * @param boolean $refresh whether to reload the collection instance even if it is found in the cache.
@@ -93,10 +104,21 @@ class Database extends Object
 	 * @param string $name name of the collection
 	 * @param array $options collection options in format: "name" => "value"
 	 * @return \MongoCollection new mongo collection instance.
+	 * @throws Exception on failure.
 	 */
 	public function createCollection($name, $options = [])
 	{
-		return $this->mongoDb->createCollection($name, $options);
+		$token = $this->getName() . '.create(' . $name . ', ' . Json::encode($options) . ')';
+		Yii::info($token, __METHOD__);
+		try {
+			Yii::beginProfile($token, __METHOD__);
+			$result = $this->mongoDb->createCollection($name, $options);
+			Yii::endProfile($token, __METHOD__);
+			return $result;
+		} catch (\Exception $e) {
+			Yii::endProfile($token, __METHOD__);
+			throw new Exception($e->getMessage(), (int)$e->getCode(), $e);
+		}
 	}
 
 	/**
@@ -104,9 +126,47 @@ class Database extends Object
 	 * @param array $command command specification.
 	 * @param array $options options in format: "name" => "value"
 	 * @return array database response.
+	 * @throws Exception on failure.
 	 */
-	public function execute($command, $options = [])
+	public function executeCommand($command, $options = [])
 	{
-		return $this->mongoDb->command($command, $options);
+		$token = $this->getName() . '.$cmd(' . Json::encode($command) . ', ' . Json::encode($options) . ')';
+		Yii::info($token, __METHOD__);
+		try {
+			Yii::beginProfile($token, __METHOD__);
+			$result = $this->mongoDb->command($command, $options);
+			$this->tryResultError($result);
+			Yii::endProfile($token, __METHOD__);
+			return $result;
+		} catch (\Exception $e) {
+			Yii::endProfile($token, __METHOD__);
+			throw new Exception($e->getMessage(), (int)$e->getCode(), $e);
+		}
+	}
+
+	/**
+	 * Checks if command execution result ended with an error.
+	 * @param mixed $result raw command execution result.
+	 * @throws Exception if an error occurred.
+	 */
+	protected function tryResultError($result)
+	{
+		if (is_array($result)) {
+			if (!empty($result['errmsg'])) {
+				$errorMessage = $result['errmsg'];
+			} elseif (!empty($result['err'])) {
+				$errorMessage = $result['err'];
+			}
+			if (isset($errorMessage)) {
+				if (array_key_exists('ok', $result)) {
+					$errorCode = (int)$result['ok'];
+				} else {
+					$errorCode = 0;
+				}
+				throw new Exception($errorMessage, $errorCode);
+			}
+		} elseif (!$result) {
+			throw new Exception('Unknown error, use "w=1" option to enable error tracking');
+		}
 	}
 }
\ No newline at end of file
diff --git a/extensions/mongo/Query.php b/extensions/mongo/Query.php
index 5f313f4..cce6645 100644
--- a/extensions/mongo/Query.php
+++ b/extensions/mongo/Query.php
@@ -131,7 +131,7 @@ class Query extends Component implements QueryInterface
 	 */
 	protected function fetchRows($cursor, $all = true, $indexBy = null)
 	{
-		$token = 'Querying: ' . Json::encode($cursor->info());
+		$token = 'find(' . Json::encode($cursor->info()) . ')';
 		Yii::info($token, __METHOD__);
 		try {
 			Yii::beginProfile($token, __METHOD__);
@@ -213,7 +213,7 @@ class Query extends Component implements QueryInterface
 	public function count($q = '*', $db = null)
 	{
 		$cursor = $this->buildCursor($db);
-		$token = 'Counting: ' . Json::encode($cursor->info());
+		$token = 'find.count(' . Json::encode($cursor->info()) . ')';
 		Yii::info($token, __METHOD__);
 		try {
 			Yii::beginProfile($token, __METHOD__);
diff --git a/tests/unit/extensions/mongo/DatabaseTest.php b/tests/unit/extensions/mongo/DatabaseTest.php
index e844d9d..6847d2e 100644
--- a/tests/unit/extensions/mongo/DatabaseTest.php
+++ b/tests/unit/extensions/mongo/DatabaseTest.php
@@ -49,15 +49,22 @@ class DatabaseTest extends MongoTestCase
 		$this->assertFalse($collection === $collectionRefreshed);
 	}
 
-	public function testCommand()
+	public function testExecuteCommand()
 	{
 		$database = $connection = $this->getConnection()->getDatabase();
 
-		$result = $database->execute([
+		$result = $database->executeCommand([
 			'distinct' => 'customer',
 			'key' => 'name'
 		]);
 		$this->assertTrue(array_key_exists('ok', $result));
 		$this->assertTrue(array_key_exists('values', $result));
 	}
+
+	public function testCreateCollection()
+	{
+		$database = $connection = $this->getConnection()->getDatabase();
+		$collection = $database->createCollection('customer');
+		$this->assertTrue($collection instanceof \MongoCollection);
+	}
 }
\ No newline at end of file