diff --git a/core/cmdbsource.class.inc.php b/core/cmdbsource.class.inc.php
index 48d67fcf4..be990a208 100644
--- a/core/cmdbsource.class.inc.php
+++ b/core/cmdbsource.class.inc.php
@@ -351,19 +351,21 @@ class CMDBSource
 	}
 
 	/**
+	 * Get the version of the database server.
+	 *
 	 * @return string
 	 * @throws \MySQLException
 	 *
-	 * @uses \CMDBSource::QueryToCol() so needs a connection opened !
+	 * @uses \CMDBSource::QueryToScalar() so needs a connection opened !
 	 */
 	public static function GetDBVersion()
 	{
-		$aVersions = self::QueryToCol('SELECT Version() as version', 'version');
-		return $aVersions[0];
+		return static::QueryToScalar('SELECT VERSION()', 0);
 	}
 
 	/**
-	 * @return string
+	 * @deprecated Use `CMDBSource::GetDBVersion` instead.
+	 * @uses mysqli_get_server_info
 	 */
 	public static function GetServerInfo()
 	{
@@ -1499,20 +1501,14 @@ class CMDBSource
 	 * Returns the value of the specified server variable
 	 * @param string $sVarName Name of the server variable
 	 * @return mixed Current value of the variable
-	 */	   	
+	 * @throws \MySQLQueryHasNoResultException|\MySQLException
+	 */
 	public static function GetServerVariable($sVarName)
 	{
-		$result = '';
-		$sSql = "SELECT @@$sVarName as theVar";
-		$aRows = self::QueryToArray($sSql);
-		if (count($aRows) > 0)
-		{
-			$result = $aRows[0]['theVar'];
-		}
-		return $result;
+		$sSql = 'SELECT @@'.$sVarName;
+		return static::QueryToScalar($sSql, 0) ?: '';
 	}
 
-
 	/**
 	 * Returns the privileges of the current user
 	 * @return string privileges in a raw format