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Magento Customer List in Back Office Only One Page of Records

Thank you kalpesh!!!! I’ve had problem for a long time only showing one page of Customers in my ‘Manage Customers’ list and I was running 1.8.1.0. I just upgraded to 1.9.2.1 and finally decided to try to tackle this issue while I was working on the server. Found this post, and now I can see all 5000+ customers.
I wonder why Magento hasn’t fixed this issue since version 1.5!!!!

http://ka.lpe.sh/2012/01/05/magento-wrong-count-in-admin-grid-when-using-group-by-clause-overriding-lib-module/

Copy Db.php file from magento / lib / Varien / Data / Collection / Db.php
Paste it to your local directory so the resultant folder structure would look like this:
magento / app / code / local / Varien / Data / Collection / Db.php

Now open this file to edit and replace getSelectCountSql function with below one

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public function getSelectCountSql()
    {
        $this->_renderFilters();

        $countSelect = clone $this->getSelect();
        $countSelect->reset(Zend_Db_Select::ORDER);
        $countSelect->reset(Zend_Db_Select::LIMIT_COUNT);
        $countSelect->reset(Zend_Db_Select::LIMIT_OFFSET);
        $countSelect->reset(Zend_Db_Select::COLUMNS);

        if(count($this->getSelect()->getPart(Zend_Db_Select::GROUP)) > 0) {
            $countSelect->reset(Zend_Db_Select::GROUP);
            $countSelect->distinct(true);
            $group = $this->getSelect()->getPart(Zend_Db_Select::GROUP);
            $countSelect->columns("COUNT(DISTINCT ".implode(", ", $group).")");
        } else {
            $countSelect->columns('COUNT(*)');
        }
        return $countSelect;
    }