Magento Mage registry key “_singleton/core/resource” already exists

Mage registry key “_singleton/core/resource” already exists is a very common problem during magento update and due to this issues many time we are getting the erros in the page “There has been an error processing your request” . In my case i found the issue is due to cache so what i did i cleaned my cache every time through index.php  of magento .

$app = Mage::app();
if ($app != null)
    $cache = $app->getCache();
    if ($cache != null)
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