After upgrading, I see the following message appear:
Strict warning: Declaration of DB_common::raiseError() should be compatible with & PEAR::raiseError($message = NULL, $code = NULL, $mode = NULL, $options = NULL, $userinfo = NULL, $error_class = NULL, $skipmsg = false) in require_once() (line 29 of /s***/crm.***.com/***/***/sites/all/modules/civicrm/packages/DB/mysqli.php).
All operations seem to be working fine though. Please help.