Erreur SQL site pretashop sur OVH

Bonjour,
Une erreur de connexion vers la base de données fait que notre site est "down"...Je recherche quelqu'un qui pourrait m'aider. L'erreur est ci-dessous...

Merci

[PrestaShopException]

Link to database cannot be established:SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
at line 102 in file classes/db/DbPDO.php

97. public function connect()
98. {
99. try {
100. $this->link = $this->_getPDO($this->server, $this->user, $this->password, $this->database, 5);
101. } catch (PDOException $e) {
102. throw new PrestaShopException('Link to database cannot be established:'.$e->getMessage());
103. }
104.
105. // UTF-8 support
106. if ($this->link->exec('SET NAMES \'utf8\'') === false) {
107. throw new PrestaShopException('PrestaShop Fatal error: no utf-8 support. Please check your server configuration.');

DbPDOCore->connect - [line 319 - classes/db/Db.php]
DbCore->__construct - [line 240 - classes/db/Db.php] - [4 Arguments]
DbCore::getInstance - [line 66 - config/alias.php]
pSQL - [line 329 - classes/shop/Shop.php] - [1 Arguments]
ShopCore::initialize - [line 114 - config/config.inc.php]
require - [line 36 - admin/index.php] - [1 Arguments]